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Thursday, August 11, 2011

BACK PAIN


Low Back Pain 


Pain in the lower or low back pain is a common concern, affecting up to 90% of Americans at some point in their lifetime. Up to 50% will have more than one episode. Low back pain is not a specific disease, rather it is a symptom that may occur from a variety of different processes. In up to 85% of people with low back pain, despite a thorough medical examination, no specific cause of the pain can be identified. America spends approximately $50 billion a year on low back pain.
Back pain can have many underlying reasons, but no specific cause will often be found, and the pain will stop. This chapter will review many of the causes of back pain and proper evaluation and diagnosis. Please discuss your symptoms and the suggested treatments with your healthcare professional to determine the appropriate diagnostic and treatment plan for your circumstances.
·         Low back pain is second only to the common cold as a cause of lost days at work. It is also one of the most common reasons to visit a doctor's office or a hospital's emergency department. It is the second most common neurologic complaint in the United States, second only to headache.
·         For 90% of people, even those with nerve root irritation, their symptoms will improve within two months no matter what treatment is used, even if no treatment is given.
·         Doctors usually refer to back pain as acute if it has been present for less than a month and chronic if it lasts longer.
Low Back Pain Causes
Back pain is a symptom. Common causes of back pain involve disease or injury to the spine's muscles, bones, and/or nerves. Pain arising from abnormalities of organs within the abdomen, pelvis, or chest may also be felt in the back. This is called referred pain. Many disorders within the abdomen, such as appendicitisaneurysms, kidney diseases, kidney infections, bladder infections, pelvic infections, and ovarian disorders, among others, can cause pain referred to the back. Normal pregnancy can cause back pain in many ways, including stretching ligaments within the pelvis, irritating nerves, and straining the low back. Your doctor will have this in mind when evaluating your pain.
·         Nerve root syndromes are those that produce symptoms of nerve impingement (a nerve is directly irritated), often due to a herniation (or bulging) of the disc between the lower back bones. Sciatica is an example of nerve root impingement. Impingement pain tends to be sharp, affecting a specific area, and associated with numbness in the area of the leg that the affected nerve supplies.
o    Herniated discs develop as the spinal discs degenerate or grow thinner. The jellylike central portion of the disc bulges out of the central cavity and pushes against a nerve root. Intervertebral discs begin to deteriorate by the third decade of life. Herniated discs are found in one-third of adults older than 20. Only 3% of these, however, produce symptoms of nerve impingement.

Picture of a herniated lumbar disc





Picture of a herniated lumbar disc, a common cause of sciatica
o    Spondylosis occurs as intervertebral discs lose moisture and volume with age, which decreases the disc height. Even minor trauma under these circumstances can cause inflammation and nerve root impingement, which can produce classic sciatica without disc rupture.
o    Spinal disc degeneration coupled with disease in joints of the low back can lead to spinal-canal narrowing (spinal stenosis). These disc and joint changes produce symptoms and can be seen on an X-ray. A person with spinal stenosis may have pain radiating down both lower extremities while standing for a long time or walking even short distances.
o    Cauda equina syndrome is a medical emergency whereby the spinal cord is directly compressed. Disc material expands into the spinal canal, which compresses the nerves. A person would experience pain, possible loss of sensation, and bowel or bladder dysfunction. This could include the inability to control urination causing incontinence, or the inability to begin urination.
·          
·         Musculoskeletal pain syndromes that produce low back pain include myofascial pain syndromes and fibromyalgia.
o    Myofascial pain is characterized by pain and tenderness over localized areas (trigger points), loss of range of motion in the involved muscle groups, and pain radiating in a characteristic distribution but restricted to a peripheral nerve. Relief of pain is often reported when the involved muscle group is stretched.
o    Fibromyalgia results in widespread pain and tenderness throughout the body. Generalized stiffness, fatigue, and muscle aches are reported.
·         Infections of the bones (osteomyelitis) of the spine are an uncommon cause of low back pain.
·         Noninfectious inflammation of the spine (spondylitis) can cause stiffness and pain in the spine that is particularly worse in the morning. Ankylosing spondylitis typically begins in adolescents and young adults.
·         Tumors, possibly cancerous, can be a source of skeletal pain.
·         Inflammation of nerves from the spine can occur with infection of the nerves with the herpes zoster virus that causes shingles. This can occur in the thoracic area to cause upper back pain or in the lumbar area to cause low back pain.
·         As can be seen from the extensive, but not all inclusive, list of possible causes of low back pain, it is important to have a thorough medical evaluation to guide possible diagnostic tests




Causes of back pain:
1.      Work-related/job
2.     Physically inactive lifestyle/immobility
3.     Mechanical causes
4.     Underlying diseases
5.      Work and Back Pain
Work-related
Back Pain and Driving
The driver and the passenger both, due to long-term sitting position, are vulnerable of getting back pains. If you are spending a lot of time in your car, there are a few tips to improve your health and to avoid back aches.
1.      Choose the car according to your needs
2.     Take regular breaks while driving long distance
3.     Take your seat forward to avoid stretching your leg to depress the clutch
4.     Adjust your mirrors properly.
5.      Try to avoid twisting when getting into the car
6.     Keep a small pillow to support your lower back
Mechanical Causes of Back Pain
These are by far the most common cause of back pain. Mechanical problems and pain rising due to such issues could be related to joint ligaments or discs in the spine. Strains, knocks, accidental injuries to the spine and a number of diseases can give rise or aggravate mechanical causes of back pain.
Examples: Growing older and aging of the vertebrae, Herniated discs, Facet joint problems, spinal stenosis (abnormal narrowing of the spinal canal)
Underlying diseases
It is much less common than the mechanical causes of back pain. However, the diseases which lead to back pain are likely to need long-term treatment as a management step.
Examples: Arthritis – (osteoarthritis, rheumatoid arthritis), Ankylosing spondylitis, Fibromyalgia, osteoporosis.

Low Back Pain Symptoms
Pain in the lumbosacral area (lower part of the back) is the primary symptom of low back pain.
·         The pain may radiate down the front, side, or back of your leg, or it may be confined to the low back.

·         The pain may become worse with activity.

·         Occasionally, the pain may be worse at night or with prolonged sitting such as on a long car trip.

·         You may have numbness or weakness in the part of the leg that receives its nerve supply from a compressed nerve.

o    This can cause an inability to plantar flex the foot. This means you would be unable to stand on your toes or bring your foot downward. This occurs when the first sacral nerve is compressed or injured.
When to Seek Medical Care

The Agency for Healthcare Research and Quality has identified 11 red flags that doctors look for when evaluating a person with back pain. The focus of these red flags is to detect fractures (broken bones), infections, or tumors of the spine. The presence of any of the following red flags associated with low back pain should prompt a visit to your doctor as soon as possible for a complete evaluation.
·         Recent significant trauma such as a fall from a height, motor vehicle accident, or similar incident
·         Recent mild trauma in those older than 50 years of age: A fall down a few steps or slipping and landing on the buttocks may be considered mild trauma.
·         History of prolonged steroid use: People with asthmaCOPD, and rheumatic disorders, for example, may be given this type of medication.
·         Anyone with a history of osteoporosis: An elderly woman with a history of a hip fracture, for example, would be considered high risk.
·         Any person older than 70 years of age: There is an increased incidence of cancer, infections, and abdominal causes of pain.
·         Prior history of cancer
·         History of a recent infection
·         Temperature over 100 F
·         IV drug use: Such behaviour markedly increases the risk of an infectious cause.
·         Low back pain worse at rest: This is thought to be associated with an infectious or malignant cause of pain but can also occur with ankylosing spondylitis.
·         Unexplained weight loss

When To Seek Medical Help?


1.      If the pain is after an accident
2.     Pain lasting more than a week
3.     High temperature
4.     Redness or swelling of the back
5.      Pain down the legs and below knees
6.     Numbness or weakness in one or both legs
7.      Loss of bladder or bowel control
The presence of any of the above would justify a visit to a hospital's emergency department, mainly if your family doctor cannot evaluate you within the next 24 hours.
· any acute nerve dysfunction should also prompt an immediate visit. These would include the inability to walk or the inability to raise or lower your foot at the ankle. Also included would be the inability to raise the big toe upward walk on your heels or stand on your toes. These might indicate an acute nerve injury or compression. Under certain circumstances, this may be an acute neurosurgical emergency.
·         Loss of bowel or bladder control, including difficulty starting or stopping a stream of urine or incontinence, can be a sign of an acute emergency and requires urgent evaluation in an emergency department.
·          
 
Low Back Pain Exams and Tests
Medical history
 
·         Because many different conditions may cause back pain, a thorough medical history will be performed as part of the examination. Some of the questions you are asked may not seem pertinent to you but are very important to your doctor in determining the source of your pain.
·         Your doctor will first ask you many questions regarding the onset of the pain. (Were you lifting a heavy object and felt an immediate pain? Did the pain come on gradually?) He or she will want to know what makes the pain better or worse. The doctor will ask you questions referring to the red-flag symptoms. He or she will ask if you have had the pain before. Your doctor will ask about recent illnesses and associated symptoms such as coughsfevers, urinary difficulties, or stomach illnesses. In females, the doctor will want to know about vaginal bleeding, cramping, or discharge. Pain from the pelvis, in these cases, is frequently felt in the back.
Physical examination
·         To ensure a thorough examination, you will be asked to wear a gown. The doctor will watch for signs of nerve damage while you walk on your heels, toes, and soles of the feet. Reflexes are usually tested using a reflex hammer. This is done at the knee and behind the ankle. As you lie flat on your back, one leg at a time is elevated, both with and without the doctor's assistance. This is done to test the nerves muscle strength, and assess the presence of tension on the sciatic nerve. Sensation is usually tested using a pin, paper clip, broken tongue depressor, or other sharp object to assess any loss of sensation in your legs.
·         Depending on what the doctor suspects is wrong with you, the doctor may perform an abdominal, pelvic, or rectal examination. These exams look for diseases that can cause pain referred to your back. The lowest nerves in your spinal cord serve the sensory area and muscles of the rectum, and damage to these nerves can result in inability to control urination and defecation. Thus, a rectal examination is essential to make sure that you do not have nerve damage in this area of your body.
Imaging
·         Doctors can use several tests to "look inside you" to get an idea of what might be causing the back pain. No single test is perfect in that it identifies the absence or presence of disease 100% of the time.
·         If there are no red flags, there is often little to be gained in obtaining X-rays for patients with acute back pain. Because about 90% of people have improved within 30 days of the onset of their back pain, most doctors will not order tests in the routine evaluation of acute, uncomplicated back pain.
·         Plain X-rays are generally not considered useful in the evaluation of acute back pain, particularly in the first 30 days. In the absence of red flags, their use is discouraged. Their use is indicated if there is significant trauma, mild trauma in those older than 50, people with osteoporosis, and those with prolonged steroid use. Do not expect an X-ray to be taken.
·         Myelogram is an X-ray study in which a radio-opaque dye is injected directly into the spinal canal. Its use has decreased dramatically since MRI scanning. A myelogram now is usually done in conjunction with a CT scan and, even then, only in special situations when surgery is being planned.
·         Magnetic resonance imaging (MRI) scans are a highly detailed test and are very expensive. The test does not use X-rays but very strong magnets to produce images. Their routine use is discouraged in acute back pain unless a condition is present that may require immediate surgery, such as with cauda equina syndrome or when red flags are present and suggest infection of the spinal canal, bone infection, tumour, or fracture.
o    MRI may also be considered after one month of symptoms to rule outmore underlying severe problems.
o    MRIs are fine. Bulging of the discs is noted on up to 40% of MRIs performed on people without back pain. Other studies have shown that MRIs fail to diagnose up to 20% of ruptured discs that are found during surgery.
·         A CT scan is an X-ray test that is able to produce a cross-sectional picture of the body. CT scan is used much like MRI.
Nerve tests
·         Electromyogram or EMG is a test that involves the placement of very small needles into the muscles. Electrical activity is monitored. Its use is usually reserved for more chronic pain and to predict the level of nerve root damage. The test is also able to help the doctor distinguish between nerve root disease and muscle disease.
Blood tests
·         Sedimentation rate or C-reactive protein are blood tests that can indicate whether or not inflammation is present in the body.
·         Complete blood count (CBC) is used to detect elevations of white blood cells and anaemia.


Chronic Back Pain and Sleep
When chronic back pain affects you or a family member,  you might despair of sleeping well. Pain can disturb the sleep your family needs, night after night. However, experts say that with proper treatment, the chances are very good that you or your loved one can get relief from chronic back pain and enjoy normal sleep. Below, find out about treatments and lifestyle tips for better sleep.
Why Sleep Is Important When You Have Chronic Back Pain

The inability to get a good night's sleep hurts -- literally. Chronic back pain prevents you from sleeping well. You can wake up hurting even more.
Pain can interfere with the normal cycles of sleep, creating a non-specific pattern of  alpha delta sleep waves found in other painful conditions such as arthritis and fibromyalgia, but also in healthy people.
Worse, studies have shown that not getting enough sleep may make you more sensitive to pain. It's a vicious cycle. Back pain can make it harder to sleep -- and your back pain can be worse when you can't sleep.
Other Causes of Sleep Problems When You Are in Pain
Anxiety and depression can make it hard to fall asleep or stay asleep, and the consequent sleep loss can lead to worse pain. Anxiety and depression themselves can also increase a person’s sensitivity to pain.
Some breathing-related sleep disorders are associated with obesity -- and obesity is also linked with back pain. Sleep disorders like obstructive sleep apnea interfere with normal sleep patterns leading to insufficient sleep and poor sleep quality. Sleep apnea can also be caused or exacerbated by opioid painkillers, which some people are prescribed for severe back pain.
Limb movement disorders like restless legs syndrome might further disrupt the normal sleep pattern.
Fibromyalgia can cause pain throughout the body. It's also linked with fatigue, anxiety, and sleep problems.
Self-medicating with alcohol might numb your back pain and help you fall asleep at first. But it's also likely to wake you up a few hours later. In the morning, you're bound to get out of bed tired, cranky, and hurting because the quality of sleep is poor.
Many prescription medications can impair the quality of your sleep. For instance,  medications for conditions such as high blood pressure, epilepsy, and ADHD may also cause sleep problems.
First aid for low back pain
 
When you first feel back pain, try these steps to avoid or reduce pain:
·         Relax. Find a comfortable position for rest. Some people are comfortable on the floor or a medium-firm bed with a small pillow under their head and another under their knees. Some prefer to lie on their side with a pillow between their knees. Don't stay in one position for too long.
·         Walk. Take a short walk (10 to 20 minutes) on a level surface (no slopes, hills, or stairs) every 2 to 3 hours. Walk only distances you can manage without pain, especially leg pain.
·         Take pain medicine if needed, such as acetaminophen (Tylenol) or medicines that reduce pain, swelling, and irritation, including ibuprofen (such as Advil or Motrin) or naproxen (such as Aleve or Naprosyn). These medicines usually work best if you take them on a regular schedule instead of waiting until the pain is severe.
·         Try heat or ice. Try using a heating pad on a low or medium setting for 15 to 20 minutes every 2 to 3 hours. Try a warm shower in place of one session with the heating pad. Or you can buy single-use heat wraps that last up to 8 hours. You can also try an ice pack for 10 to 15 minutes every 2 to 3 hours. You can use an ice pack or a bag of frozen vegetables wrapped in a thin towel. There is not strong evidence that either heat or ice will help, but you can try them to see if they help. You may also want to try switching between heat and cold.


Taking care of your back at home
 

A common misconception about back pain is that you need to rest and avoid activity for a long time. In fact, bed rest is NOT recommended. If you have no sign of a serious cause for your back pain (such as loss of bowel or bladder control, weakness, weight loss, or fever), then you should stay as active as possible. Here are some tips for how to handle back pain and activity early on:
  • Stop normal physical activity only for the first few days. This helps calm your symptoms and reduce any swelling (inflammation) in the area of the pain.
  • Apply heat or ice to the painful area. One good method is to use ice for the first 48 to 72 hours, then use heat after that.
  • Take over-the-counter pain relievers such as ibuprofen (Advil, Motrin IB) or acetaminophen (Tylenol).
  • Sleep in a curled-up, fetal position with a pillow between your legs. If you usually sleep on your back, place a pillow or rolled towel under your knees to relieve pressure.
  • Do NOT perform activities that involve heavy lifting or twisting of your back for the first 6 weeks after the pain begins.
  • Avoid exercise in the days right after the pain begins. However, after 2 to 3 weeks, slowly begin to exercise again (it's helpful to get advice from a physical therapist). You can start getting back to regular activities after a few days.
EXERCISE AND YOUR BACK PAIN
Exercise is important for preventing future back pain. Through exercise you can:
  • Improve your posture
  • Strengthen your back and improve flexibility
  • Lose weight
  • Avoid falls
A complete exercise program should include aerobic activity (such as walking, swimming, or riding a stationary bicycle), stretching, and strength training. Always follow the instructions of your doctor or physical therapist.
Begin with light cardiovascular training. Walking, riding a stationary bicycle, and swimming are great examples. Such aerobic activities can help improve blood flow to your back and promote healing. They also strengthen muscles in your stomach and back.
Stretching and strengthening exercises are essential in the long run. However, starting these exercises too soon after an injury can worsen your pain. A physical therapist can help you determine when to begin stretching and strengthening exercises and how to do them.
Avoid these exercises during recovery, unless your doctor or physical therapist says it is okay:
  • Jogging
  • Contact sports
  • Racquet sports
  • Golf
  • Dancing
  • Weight lifting
  • Leg lifts when lying on your stomach
  • Sit-ups with straight legs (rather than bent knees)
PREVENTING YOUR BACK PAIN FROM COMING BACK
Low Back Pain - Why Exercise Helps
Exercise and staying active may relieve lower back pain and help speed your recovery. Stretching and strengthening your stomach, back, and leg muscles helps make them less susceptible to injury that can cause back pain. Strong stomach, back, and leg muscles support your spine better, reducing pressure on your spinal discs. This may help prevent disc injury.

Aerobic exercises—such as walking, swimming, or walking in waist-deep water—also help you maintain a healthy back. Aerobic exercise makes your heart and other muscles use oxygen more efficiently. Muscles that frequently receive oxygen-rich blood stay healthier.







Exercises that may help reduce or prevent low back pain include:
·                     Aerobic exercise to condition your heart and other muscles, maintain health, and speed recovery.
·                     Strengthening exercises, focusing on your back, stomach, and leg muscles.
·                     Stretching exercises to keep your muscles and other supporting tissues flexible and less prone to injury.


Some exercises can aggravate back pain. If you have low back pain,avoid:
·                     Straight leg sit-ups.
·                     Bent leg sit-ups or partial sit-ups (curl-ups) when you have acute back pain.
·                     Lifting both legs while lying on your back (leg lifts).
·                     Lifting heavy weights above the waist (standing military press or bicep curls).
·                     Toe touches while standing.
·          


To prevent back pain, it is also very important to learn to lift and bend properly. Follow these tips:


  • If an object is too heavy or awkward, get help.
  • Spread your feet apart to give you a wide base of support.
  • Stand as close to the object you are lifting as possible.
  • Bend at your knees, not at your waist.
  • Tighten your stomach muscles as you lift the object or lower it down.
  • Hold the object as close to your body as you can.
  • Lift using your leg muscles.
  • As you stand up with the object, DO NOT bend forward.
  • DO NOT twist while you are bending for the object, lifting it up, or carrying it.
Other measures to prevent back pain include:
  • Avoid standing for long periods of time. If you must stand for your work, try using a stool. Alternate resting each foot on it.
  • DO NOT wear high heels. Use cushioned soles when walking.
  • When sitting for work, especially if using a computer, make sure that your chair has a straight back with an adjustable seat and back, armrests, and a swivel seat.
  • Use a stool under your feet while sitting so that your knees are higher than your hips.
  • Place a small pillow or rolled towel behind your lower back while sitting or driving for long periods of time.
  • If you drive long distance, stop and walk around every hour. Bring your seat as far forward as possible to avoid bending. Don't lift heavy objects just after a ride.
  • Quit smoking.
  • Lose weight.
  • Do exercises to strengthen your abdominal muscles on a regular basis. This will strengthen your core to decrease the risk of further injuries.

Bone Spurs (Osteophytes) and Back Pain

Many patients are told that they have bone spurs in their back or neck, with the implication that the bone spurs are the cause of their back pain. However, bone spurs in and of themselves are simply an indication that there isdegeneration of the spine; the presence of bone spurs does not necessarily mean that they are the actual cause of the patient's back pain.
The term "bone spurs" is a bit of a misnomer, as the word "spurs" implies that these bony growths are spurring or poking some part of the spinal anatomy and causing pain. However, contrary to this implication, bone spurs are, in fact smooth structures that form over a prolonged period.
The medical term for bone spurs is osteophytes, which represent a normal bony structure enlargement. Osteophytes are a radiographic marker of spinal degeneration (ageing), which means that they show up on X-rays or MRI scans and are by and large a normal finding as we age. Over the age of 60, bone spurs on the spine are actually quite common.




Bone Spurs and Spinal Anatomy

The human spine comprises thirty-two separate vertebral segments separated by intervertebral discs made of collagen and ligaments. These discs are shock absorbers, allowing limited flexibility and motion at each spinal segment. The cumulative effect allows a full range of movement around the axis of the spine, especially the neck (cervical spine) and lower back (lumbar spine).
Motion between each segment is limited by the tough outer disc ligaments and the joints that move (articulate) at each spinal level (the facet joint). Under each joint, just behind the disc, is a pair of nerve roots that exit the spinal canal. The exiting hole (foramina) surrounding the nerve (disc in front, joints above and below) is relatively small and has little room for anything besides the exiting nerve.
Normal life stressors, possibly compounded by traumatic injuries to the spinal architecture, cause degeneration in the spine's discs and joints. With factors such as age, injury, and poor posture, there is cumulative damage to the bone or joints of the spine. For example:
1.     As disc material slowly wears out, ligaments loosen and excess motion occurs at the joint
2.     The body naturally and necessarily thickens the ligaments that hold the bones together
3.     Over time, the thick ligaments tend to calcify, resulting in flecks of bone or bone spur formation
4.     As the central spinal canal and the foramina thicken their ligaments, compression of the nervous system causes clinical symptoms.
Degenerative changes to normal vital tissue begin in early adulthood, but usually this slow process only presents with nervous system compression once we are in our sixth or seventh decades. Factors that can accelerate the degenerative process and bone spur growth in the spine include:
·         Congenital or heredity
·         Nutrition
· Lifestyle, including poor posture and poor ergonomics
·         Traumatic forces, especially sports-related injuries and motor vehicle accidents.

Frequent Factors of Low Back Pain and What You Can Do
 

All the various problems connected to low back discomfort are costly for many Western countries. in fact, it is realistic that nearly every person has experienced some kind of mild variety of low back pain. Accidents and pain in the lower back, or medically known as the lumbosacral region, is one of the leading causes of job-related impairment and missed work. When it pertains to difficulties that are neurologically related in the US, only headaches beat back pain. It is common knowledge that low back pain can be temporary or produce more serious and chronic problems. As you can imagine, many diverse factors may be found with a low back pain situation. A person can strain back muscles, ligaments, or something worse, affecting the vertebrae and discs. Unnecessary stress can be subjected to the back from physical imbalances that basically put too much strain and tension on the lower back, or any other back area. the common result is that the back cannot take it anymore, and subsequently problems start to surface. We have all been aware of, or maybe experienced, back injuries caused by the smallest actions. back pain can reveal itself in alternative ways, and it really has to do with the distinct situation. There is the kind that is acute pain felt instantly. Chronic pain lasts and may begin at a low grade and afterward maybe remain that way for a very long time. As is evident, serious low back pain usually stems from some type of trauma. in that predicament, mechanical abnormality or genuine damage creates the acute pain. the general symptoms for this form of pain can be a piercing painful feeling that really gets your particular attention. Additionally, it is quite prevalent to have a lowering in motion or range of actions. probably all of us have noticed someone who has to tilt forward just slightly because that is more comfortable for their back. One type of continual exposure to frequent vibrational motion makes a person vulnerable to a herniated spinal disc. On the other hand, it is even conceivable for an extreme load on the back to develop this, too. Plenty of things help with back health such as being too tight, on the whole, due to not enough good exercise and stretching. What tends to make matters worse with a herniated disc is that it often results in various nerves being pinched. You should never fool around with any kind of back ache since you can worsen the condition. Unexpected pain that is acute in nature is critical and should be evaluated by a doctor promptly. in that kind of circumstance, you can quickly make matters more painful and cause additional damage if you continue to act like there is no problem. Constantly remember to lift using your legs and not your back, and at all times keep your back straight when you lift. for those who enjoyed reading this post then you may wish to look at alternative topics from this article writer linen tea towels, retirement investment strategy and tama drum kits.

Low Back Pain - Why Exercise Helps
 
Exercise and staying active may relieve low back pain and help speed your recovery. Stretching and strengthening your stomach, back, and leg muscles helps make them less susceptible to injury that can cause back pain. Strong stomach, back, and leg muscles support your spine better, reducing pressure on your spinal discs. This may help prevent disc injury.

Aerobic exercises—such as walking, swimming, or walking in waist-deep water—also help you maintain a healthy back. Aerobic exercise makes your heart and other muscles use oxygen more efficiently. Muscles that frequently receive oxygen-rich blood stay healthier.

Exercises that may help reduce or prevent low back pain include:
·                     Aerobic exercise, to condition your heart and other muscles, maintain health, and speed recovery.
·                     Strengthening exercises, focusing on your back, stomach, and leg muscles.
·                     Stretching exercises, to keep your muscles and other supporting tissues flexible and less prone to injury.
Some exercises can aggravate back pain. If you have low back pain, avoid:
·                     Straight leg sit-ups.
·                     Bent leg or partial sit-ups (curl-ups) when you have acute back pain.
·                     Lifting both legs while lying on your back (leg lifts).
·                     Lifting heavy weights above the waist (standing military press or bicep curls).
·                     Toe touches while standing.

Iron Man-Like Exoskeleton Nears Production



A real-life version of the famed robotic exoskeleton is a "mere" five years from production.

By now, with films like Iron Man, its sequel, and Avatar, Hollywood has made us thoroughly familiar with the idea of the robotic exoskeleton. Less well known, however, is that researchers areactually building robotic exoskeletons like the ones envisioned by Hollywood and the comic book visionaries from whom Hollywood pilfers its most lucrative ideas. Among the developers of real-lifeIron Man suits (of which there are many, the world over) is a group called Raytheon Sarcos. And as IEEE Spectrum reports in this month's issue, its impressive second-generation exoskeleton robotics suit, dubbed the XOS 2, is nearing production.
"Nearing production," in the tech world, is even looser of a phrase than in Hollywood, where screenwriters often whine of interminable delays to shooting. It'll take five years to start deploying a version of the suit that must be tethered to a power source (hardly an arrangement that would befit the exploits of a would-be Tony Stark). And for a free-range version, expect to wait a decade or more, per Fraser Smith, VP of operations of Raytheon Sarcos (which is itself a subgroup ofRaytheon Integrated Defense Systems).
Spectrum also has the specs on the new version of the suit (which, incidentally, was dubbed one of Time's "Best Inventions of 2010"). It uses a system of high-pressure hydraulics, sensors, actuators and controllers, all "while leaving its wearer agile enough to kick a soccer ball." In the way technological progress tends to offer win-win scenarios, the XOS 2 is both lighter and stronger (not to mention more durable) than the XOS 1, which debuted in 2008.
Explains the story's author, Susan Karlin, Raytheon Sarcos engineers have increased the suit's power efficiency by "cutting the suit's weight and redesigning the servo valves so that more hydraulic fluid can be forced through them without undue turbulence." (They hope to lop off another 70% worth of power consumption.) The suit uses Ethernet-connected sensors throughout the suit; these are connected to distributed computer processors, which in turn prompt actuators to "deliver up to 200 kg per square centimeter of force through high-pressure hydraulics."
Intense stuff--and it all came, in the end, from the minds of a couple comic book writers. Karlin quotes one of them, Bob Layton, who says, "It makes sense that it would find its way into reality. All those engineers were probably comic geeks as kids." (And a Raytheon Sarcos rep confirmed that the company was "full of geeks.")
Bullies, then, might want to watch out who they pick on on the playground. For our part, we're more keen on the peace-time applications of technology like this--but at the end of the day, this is a project closely tied to more bellicose uses. With geeks at the helm, the engineering of a suit like this gives new meaning to the phrase "revenge of the nerds."

Venture Capitalists Back Away from Clean Energy



Rooftop solar: Solar City installed the solar panels on this house. Lately, investors would rather fund companies that put solar panels on roofs than ones that manufacture the solar panels.
Credit: Solar City

ENERGY


Their shift toward low-risk projects could strand innovative renewable-energy technology in the lab.
  • BY KEVIN BULLIS
As governments around the world are scaling back support for renewable energy, venture capitalists are shifting their clean technology investment strategy. They're focusing less on high-risk technologies and more on technologies, such as those for improving energy efficiency, that could have a faster payoff but a smaller impact. The shift is raising concerns about how innovative energy technologies will  be commercialized.
Venture capitalists have traditionally focused on companies with low capital requirements that can quickly get bought up or go public. Many Internet startups fall into this category. But in recent years, many venture capitalists have been enticed to risk longer-term, high-capital energy investments in clean energy, thanks to by generous government subsidies in renewable energy markets. In particular, they spent hundreds of millions of dollars on solar-cell startups that need to build expensive equipment and factories to prove their technologies, and can take many years to generate a return on investment.
Now many venture-capital firms are going back to their roots. Dozens recently stopped making initial investments in clean technology companies, according to Dow Jones Venture Source. Many that continue to invest in clean technology are shifting to areas such as energy efficiency, which includes low-capital projects such as software for monitoring and reducing energy consumption, according to an analysis by the Cleantech Group.
The money that still goes to the solar industry is now directed to companies with small capital requirements. Rooftop solar panel installers are one example. (In June, Solar City got $280 million from Google to fund solar installations.) There's still some funding for solar-cell companies, such as for 1366 Technologies and Alta Devices, that are developing technology that the companies say can compete with fossil fuels. But "it's a harder place to raise funds for new ventures," says Sheeraz Haji, CEO of Cleantech Group.
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The shift has been propelled by a number of factors. There are fewer good companies available.  Many of the most promising companies—those based on technology developed over decades in labs—have already been funded. Large investments in conventional technologies, such as silicon solar cells, are also driving down prices and making it more difficult for new companies to enter the market.
And now government support is being cut, and some analysts doubt that the fast growth of the clean energy markets can be sustained. Germany, Italy, and Spain are cutting back subsidies for renewable energy. In the United States, funding for clean energy from the 2009 stimulus legislation  is running out.  Next month is the deadline for projects to get funding from a loan-guarantee program worth tens of billions of dollars. The program is important for companies that want to build large-scale projects using technology that private investors would normally consider too risky. Budget cuts in the United States could also hurt funding for R&D and new energy technologies.
Globally, nearly seven-eighths of clean-energy funding—including financing for wind farms—goes to established  technologies, says David Victor, director of the Laboratory on International Law and Regulation at the University of California, San Diego. "We're on the cusp of a severe challenge for energy innovation,"  he says.

நல்ல டாக்டர்கள் `இருவர்'


நலவாழ்வு வாழ நீங்கள் நாட வேண்டிய `இயற்கை' மருத்துவர்கள், இரண்டு பேர். இவர்கள் ஒவ்வொருவரும் ஒவ்வொரு விதத்தில் உடல் நலனைக் கட்டிக்காப்பதில் கைதேர்ந்த `நிபுணர்கள்'. அவர்கள் யாரென்று அடையாளம் தெரிய இதோ அவர்கள் முகவரி...

1

காலையில் எழுந்ததும் இவரிடம் உடலைக் காட்டுவதுதான், நமது உடலை `செக்கப்' செய்து கொள்ளும் செலவில்லாத வழி. அவர் உடனே பல வியாதிகருக்கு தடுப்பு மருந்தை உடலில் செலுத்தி விடுவார். காசு எதுவும் கேட்க மாட்டார். அந்த டாக்டர் வேறு யாருமல்ல `சூரிய'பகவான்தான்.


`சூரிய ஒளி புகாத வீட்டில் டாக்டர் நுழைவார்' என்பது பழமொழி. சூரிய ஒளி உடலுக்கு என்னென்ன நலன்களைத் தருகிறது தெரியுமா?


* சருமத்திற்கு பொலிவு தருகிறது. உடலில் நோய் எதிர்ப்பு பணியைச் செய்யும் ரத்த வெள்ளையணுக்கள் அதிகம் உற்பத்தியாக உதவுகிறது. இதனால் நோய் எதிர்ப்பு சக்தி அதிகரிக்கும்.


* சூரிய ஒளி, உணவு செரிமானத் தன்மையை அதிகரிப்பதில் முக்கியப் பங்கு வகிக்கிறது. கழிவுகளை வெளியேற்ற உதவும், வளர்ச்சிதை மாற்றத்திற்கும் துணை புரியும்.


* உடல் ஊட்டச்சத்தில் முக்கிய பங்கு வகிக்கும் `வைட்டமின் டி` கிடைக்கச் செய்கிறது. சமீபத்திய ஆய்வில், மாலை இளம் வெயிலில் நடைபயணம் செய்வது ஆண்மை வீரியம் கிடைக்க உதவுவதாக கண்டறியப்பட்டிருக்கிறது.


* காலை மாலை இளம் வெயிலின் மூலம் உடலில் சூரிய ஒளி படுவதால் புற ஊதாக் கதிர்கள் உடலில்படும். அது வைரஸ், பாக்டீரியா, ஒட்டுண்ணி போன்ற கிருமிகளைக் கொல்லும் தன்மை கொண்டது. உச்சி வெயிலில் கிடைக்கும் அதிகமான புற ஊதாக்கதிர் உடலுக்கு தீங்கு விளைவிக்கும்.


* சூரிய ஒளி படாமல் வாழ்பவர்களுக்கு புற்றுநோய் ஏற்படும் வாய்ப்பு அதிகம்.


* நலத்துடன் வாழ விரும்புபவர்கள் காலை, மாலை வெயிலில் சிறிது நேரம் (குறைந்தது 10 நிமிடங்கள்) உலவும் படியான பணிகளைச் செய்தாலே போதும். இந்த நன்மைகளெல்லாம் உங்களுக்கு கிடைத்துவிடும்.


2

கசப்பில்லா மருந்து தருவது இவரின் வாடிக்கை. எனவே அனைவரும் மகிழ்ச்சியுடனே இவர் தரும் மருந்தை சாப்பிடுவார்கள். நோயில்லாத நேரங்களிலும் எல்லாரும் இந்த மருந்தைச் சாப்பிடுகிறார்கள். மற்ற மருந்துகள் ஒரு நாளைக்கு ஒரு டோஸ், 3 டோஸ் என்றால் இந்த மருந்தை தினமும் 8 முதல் 10 டோஸ் (டம்ளர்) சாப்பிடலாம். அத்தனை சர்வசஞ்சீகை மூலிகை அது.

புரியவில்லையா... தண்ணீர்தாங்க அந்த மருத்துவர்.


இயற்கை தந்த அற்புத மூலிகை இது. உடல் அதிகப்படியாய் இருப்பது தண்ணீர்தான். உடலில் ஒவ்வொரு செல்லும் பாதிக்குமேல் தண்ணீரைக் கொண்டிருக்கிறது. தண்ணீர் உடலை எவ்வாறெல்லாம் வளப்படுத்துகிறது தெரியுமா?


* சோடியம், பொட்டாசியம், குளோரைடு, பைகார்பனேட் அடங்கிய எலக்ட்ரோலைட் என்னும் மூலக்கூறு உடல் இயக்கத்துக்கு அவசியமானது. போதிய தண்ணீர் கிடைத்தால்தான் உணவுகளில் இருந்து எலக்ட்ரோலைட் கிடைக்க ஏதுவாகும். இல்லாவிட்டால் செல்கள் வறண்டுவிடும் அல்லது மாண்டுபோகும்.


* உடல் தளதளவென்று அழகு பெற தண்ணீர் அவசியம். உடலில் கொலஸ்டிரால் (கெட்ட கொழுப்பு) அதிகமாகாமல் தடுக்கும்.


* தினமும் சாப்பிடுவதற்கு அரை மணி நேரத்திற்கு முன்பு 2 கிளாஸ் தண்ணீர் குடிக்க வேண்டும்.


* தண்ணீர் வாதநோய் ஏற்படுவதை தடுக்கும். இதயம், மூளைக்குச் செல்லும் தமனிகள் தடையின்றி செயல்பட உதவும்.


* மூளை 85 சதவீதம் தண்ணீரால் ஆனது. தண்ணீர் பருகுவதற்கேற்ப மூளை புத்துணர்ச்சி பெறும். இதனால் நீங்கள் உற்சாகமாக செயல்படுவீர்கள். நினைவுத்திறன் அதிகரிக்கும். ஞாபகமறதி வியாதிகள் ஏற்படாமல் தடுக்கும்.


* தினமும் குறைந்தது 8 டம்ளர் (2 லிட்டர்) நீர் பருகுவது ஆரோக்கியத்திற்கு அவசியம். உங்களின் தாகத்தில்தான் உடல் ஆரோக்கியத்தின் தாக்கம் இருக்கிறது என்கிறார் புளோரிடா மருத்துவ நிபுணர் பத்மாங்கலிட்ஜ்.




என்றும் அன்புடன்,
P. குண சேகரன்

Major discovery explains how adult brain cleans out dead brain cells, produces new ones



 Neuroscience 
(Medical Xpress) -- Adult brains generate thousands of new brain cells called neurons each day; however only a small fraction of them survive. The rest die and are consumed by scavenger cells called phagocytes. Until now, scientists have not fully understood how this process works, which phagocytes are unique in the brain, and how the removal of dead neurons influences the production of new neurons.
In humans, neurogenesis, or the formation of new neurons, largely ceases in most areas of the brain during adulthood. However, in two brain areas there is strong evidence that substantial numbers of new neurons are naturally generated (in the hippocampus, which is involved in memory forming, organizing and storing, and the olfactory bulb, involved in the perception of odors).
UVA Health System researchers have made a pivotal discovery in understanding this complicated process, and their findings could one day help scientists devise novel therapies to promote neurogenesis in the adult brain and re-establish its function in patients suffering from depression, post-traumatic stress disorder, and other mental disorders, in which adult neurogenesis is impaired .
The findings appear in a study published online July 31, 2011 in the journal Nature Cell Biology and led by two UVA researchers -- Jonathan Kipnis, PhD, associate professor of neuroscience, and Kodi S. Ravichandran, PhD, chair of the UVA Department of Microbiology and director of the UVA Center for Cell Clearance. Zhenjie Lu, PhD, is the first author on this work and was instrumental in combining the methodologies in the Kipnis lab (which focuses on basic mechanisms underlying neurological disorders) and the Ravichandran lab (which focuses on cell clearance) to address adult neurogenesis through a combination of in vivo studies in normal and genetically altered mice, and ex vivo studies using neuronal cultures.
Through their research, UVA scientists discovered that certain types of progenitor cells, called the doublecortin (DCX)-positive neuronal progenitors (or “newborn neurons”), serve a dual role in the regulation of production and elimination of new brain cells. Progenitor cells generally act as a repair system for the body, replenishing special cells and maintaining blood, skin and intestinal tissues.  This new discovery points to the ability of these cells to clean each other out, which ultimately benefits the regeneration process.
“Our study provides the first evidence that DCX+ cells, in addition to serving their function as neuronal precursors in the brain, also function as phagocytes [scavenger cells] by clearing out their dead brethren -- and that this process is required to maintain continuous generation of new neurons in the brain,” says Kipnis.
“These findings raise the possibility that this newly discovered process could be manipulated to rejuvenate the brain by regulating the addition of new neurons,” says Ravichandran.
This discovery, Kipnis adds, also could shed new light on our understanding of how the process of adult neurogenesis is regulated in the healthy brain, and in turn provide insights on diseased brains, where adult neurogenesis is severely impaired.
“The birth and death of new neurons in the adult brain have been implicated in ongoing learning and memory,” says Kevin Lee, PhD, chair of the Department of Neuroscience and professor of neurological surgery. “The findings by Kipnis, Ravichandran, Lu and associates are fascinating, because they describe a novel process regulating the production and removal of adult-born neurons. This represents an important step toward identifying mechanisms that might be manipulated to control the number of new neurons in the adult brain. Regulating new adult neurons in this manner could open a novel avenue for modifying basic cognitive functions, including learning.”
More information: Research paper: http://www.nature. … ncb2299.html
Provided by University of Virginia
"Major discovery explains how adult brain cleans out dead brain cells, produces new ones." August 10th, 2011. http://medicalxpress.com/news/2011-08-major-discovery-adult-brain-dead.html
Posted by
Robert Karl Stonjek

Spoiler alert: Stories are not spoiled by 'spoilers'



 Psychology & Psychiatry

Many of us go to extraordinary lengths to avoid learning the endings of stories we have yet to read or see – plugging our ears, for example, and loudly repeating "la-la-la-la," when discussion threatens to reveal the outcome. Of book and movie critics, we demand they not give away any plot twists or, at least, oblige with a clearly labeled "spoiler alert." We get angry with friends who slip up and spill a fictional secret.
But we're wrong and wasting our time, suggests a new experimental study from the University of California, San Diego. People who flip to the last page of a book before starting it have the better intuition. Spoilers don't spoil stories. Contrary to popular wisdom, they actually seem to enhance enjoyment.
Even ironic-twist and mystery stories – which you'd be forgiven for assuming absolutely depend on suspense or surprise for success – aren't spoiled by spoilers, according to a study by Nicholas Christenfeld and Jonathan Leavitt of UC San Diego's psychology department, to be published in a forthcoming issue of the journal Psychological Science.
Christenfeld and Leavitt ran three experiments with a total of 12 short stories. Three types of stories were studied: ironic-twist, mystery and literary. Each story – classics by the likes of John Updike, Roald Dahl, Anton Chekhov, Agatha Christie and Raymond Carver – was presented as-is (without a spoiler), with a prefatory spoiler paragraph or with that same paragraph incorporated into the story as though it were a part of it. Each version of each story was read by at least 30 subjects. Data from subjects who had read the stories previously were excluded.
Subjects significantly preferred the spoiled versions of ironic-twist stories, where, for example, it was revealed before reading that a condemned man's daring escape is all a fantasy before the noose snaps tight around his neck.
The same held true for mysteries. Knowing ahead of time that Poirot will discover that the apparent target of attempted murder is, in fact, the perpetrator not only didn't hurt enjoyment of the story but actually improved it.
Subjects liked the literary, evocative stories least overall, but still preferred the spoiled versions over the unspoiled ones.
Why? The answers go beyond the scope of the study, but one possibility is perhaps the simplest one: that plot is overrated.
"Plots are just excuses for great writing. What the plot is is (almost) irrelevant. The pleasure is in the writing," said Christenfeld, a UC San Diego professor of social psychology.
"Monet's paintings aren't really about water lilies," he said.
It's also possible that it's "easier" to read a spoiled story. Other psychological studies have shown that people have an aesthetic preference for objects that are perceptually easy to process.
"So it could be," said Leavitt, a psychology doctoral student at UC San Diego, "that once you know how it turns out, it's cognitively easier – you're more comfortable processing the information – and can focus on a deeper understanding of the story."
But the researchers are careful to note that they do not have a new recipe for writers to follow. After all, spoilers helped only when presented in advance, outside of the piece. When the researchers inserted a spoiler directly into a story, it didn't go over quite as well.
The overall findings are consistent with the experience most of us have had: A favorite tale can be re-read multiple times with undiminished pleasure. A beloved movie can be watched again and again.
"Stories are a universal element of human culture, the backbone of the billion-dollar entertainment industry, and the medium through which religion and societal values are transmitted," the researchers write. In other words, narratives are incredibly important. But their success doesn't seem to hinge on simple suspense.
Christenfeld and Leavitt conclude the paper by saying that perhaps some of our "other intuitions about suspense may be similarly wrong."
"Perhaps," they write, "birthday presents are better when wrapped in cellophane, and engagement rings are better when not concealed in chocolate mousse."
We might be also well-advised to reconsider surprise parties, Christenfeld said. Meanwhile, he and Leavitt continue to investigate what makes stories work – or not. Numerous recent scandals about fictionalized memoirs have inspired them to explore why it matters that a story be true. "Why does it matter," Christenfeld said, "whether something happened to one person in five billion or to no one? If the story is still a good story, why do we care?"
Provided by University of California - San Diego
"Spoiler alert: Stories are not spoiled by 'spoilers'." August 10th, 2011. http://medicalxpress.com/news/2011-08-spoiler-stories-spoilers.html
Posted by
Robert Karl Stonjek