As we enter the second decade of the 21st century, there is one thing nearly all modern Americans have in common: we sit all the time. Though our great shift towards computer-based work has done great things for productivity, it has, unfortunately, done terrible things for our health. From increased risk of heart disease and obesity in the long term, to sharply hampered cholesterol maintenance in the short term, the negative health effects of sitting are starting to weigh heavily against the benefits. Even the medical field – the greatest advocates of reducing sitting time – is plagued by this new health issue. Though doctors and nurses get plenty of walking time, it usually falls to the secretaries, billers, and coders to do all the sitting. And, as we can see, something has to change.
Sitting up straight is not the best position for office workers, a study has suggested.
Scottish and Canadian researchers used a new form of magnetic resonance imaging (MRI) to show it places an unnecessary strain on your back.
They told the Radiological Society of North America that the best position in which to sit at your desk is leaning back, at about 135 degrees.
Experts said sitting was known to contribute to lower back pain.
Data from the British Chiropractic Association says 32% of the population spends more than 10 hours a day seated.
Two thirds of people also sit down at home when they get home from work.
The research was carried out at Woodend Hospital in Aberdeen.
Twenty two volunteers with healthy backs were scanned using a positional MRI machine, which allows patients the freedom to move – so they can sit or stand – during the test.
Traditional scanners mean patients have to lie flat, which may mask causes of pain that stem from different movements or postures.
In this study, the patients assumed three different sitting positions: a slouching position, in which the body is hunched forward as if they were leaning over a desk or a video game console, an upright 90-degree sitting position; and a «relaxed» position where they leaned back at 135 degrees while their feet remained on the floor.
The researchers then took measurements of spinal angles and spinal disk height and movement across the different positions.
Spinal disk movement occurs when weight-bearing strain is placed on the spine, causing the disk to move out of place.
Disk movement was found to be most pronounced with a 90-degree upright sitting posture.
It was least pronounced with the 135-degree posture, suggesting less strain is placed on the spinal disks and associated muscles and tendons in a more relaxed sitting position.
The «slouch» position revealed a reduction in spinal disk height, signifying a high rate of wear and tear on the lowest two spinal levels.
When they looked at all test results, the researchers said the 135-degree position was the best for backs, and say this is how people should sit.
‘Tendency to slide’
Dr Waseem Bashir of the Department of Radiology and Diagnostic Imaging at the University of Alberta Hospital, Canada, who led the study, said: «Sitting in a sound anatomic position is essential, since the strain put on the spine and its associated ligaments over time can lead to pain, deformity and chronic illness.»
Rishi Loatey of the British Chiropractic Association said: «One in three people suffer from lower back pain and to sit for long periods of time certainly contributes to this, as our bodies are not designed to be so sedentary.»
Levent Caglar from the charity BackCare, added: «In general, opening up the angle between the trunk and the thighs in a seated posture is a good idea and it will improve the shape of the spine, making it more like the natural S-shape in a standing posture.
«As to what is the best angle between thigh and torso when seated, reclining at 135 degrees can make sitting more difficult as there is a tendency to slide off the seat: 120 degrees or less may be better.»
V-Sit While You Sit
Reclaim those wasted minutes waiting for your computer to boot up by using them to do these quick and powerful seated chair office exercises. «The v-sit is one of the most effective ways to strengthen your entire midsection,» says Smith, and you don’t have to get on the floor to do it. In fact, this move is easy to do even in a skirt and heels, and is so subtle no one will know you’re doing it. 1. While sitting, scoot your butt to the front of your chair. Then lean back so that your upper back rests lightly on the seat back. Contract abs and lift your right knee up, then place your foot back down on the floor. Repeat with your left leg, doing 10 reps on each side. 2. Then, sit up straight on the front edge of your chair, engage abs and lean back again to lean upper back against the chair back. Sit up straight again, using your abs. Smith suggests 10 reps of the alternating leg exercises, then 10 reps of the front and back exercise. Once you get strong enough, pull both legs up during the exercises. Then do the movements together—legs come up, lean your upper back to the chair back, then sit up straight, and legs go back down
ScienceDaily (Jan. 16, 2010) — If you’re prone to worrying whether your ‘bum looks big in this’, particularly after the Christmas period, you can take comfort that there may be health benefits.
Oxford University scientists — who have looked at all the evidence on the health effects of storing more fat on the hips, thighs and bum, rather than around the waist — show that having a ‘pear shape’ is not just less bad for you than an ‘apple shape’, but actively protects against diabetes and heart disease.
For more information read: http://www.sciencedaily.com/releases/2010/01/100116104535.htm