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2010-05-02 11:33:48
Fri Apr 30, 8:08 am ET
If you're reading this article sitting down -- the position we all hold more
than any other, for an average of 8.9 hours a day -- stop and take stock of how
your body feels. Is there an ache in your lower back? A light numbness in your
rear and lower thigh? Are you feeling a little down?
These symptoms are all normal, and they're not good. They may well be caused by
doing precisely what you're doing -- sitting. New research in the diverse
fields of epidemiology, molecular biology, biomechanics, and physiology is
converging toward a startling conclusion: Sitting is a public-health risk. And
exercising doesn't offset it. "People need to understand that the qualitative
mechanisms of sitting are completely different from walking or exercising,"
says University of Missouri microbiologist Marc Hamilton. "Sitting too much is
not the same as exercising too little. They do completely different things to
the body."
In a 2005 article in Science magazine, James A. Levine, an obesity specialist
at the Mayo Clinic, pinpointed why, despite similar diets, some people are fat
and others aren't. "We found that people with obesity have a natural
predisposition to be attracted to the chair, and that's true even after obese
people lose weight," he says. "What fascinates me is that humans evolved over
1.5 million years entirely on the ability to walk and move. And literally 150
years ago, 90% of human endeavor was still agricultural. In a tiny speck of
time we've become chair-sentenced," Levine says.
Hamilton, like many sitting researchers, doesn't own an office chair. "If
you're standing around and puttering, you recruit specialized muscles designed
for postural support that never tire," he says. "They're unique in that the
nervous system recruits them for low-intensity activity and they're very rich
in enzymes." One enzyme, lipoprotein lipase, grabs fat and cholesterol from the
blood, burning the fat into energy while shifting the cholesterol from LDL (the
bad kind) to HDL (the healthy kind). When you sit, the muscles are relaxed, and
enzyme activity drops by 90% to 95%, leaving fat to camp out in the
bloodstream. Within a couple hours of sitting, healthy cholesterol plummets by
20%.
The data back him up. Older people who move around have half the mortality rate
of their peers. Frequent TV and Web surfers (sitters) have higher rates of
hypertension, obesity, high blood triglycerides, low HDL cholesterol, and high
blood sugar, regardless of weight. Lean people, on average, stand for two hours
longer than their counterparts.
The chair you're sitting in now is likely contributing to the problem. "Short
of sitting on a spike, you can't do much worse than a standard office chair,"
says Galen Cranz, a professor at the University of California at Berkeley. She
explains that the spine wasn't meant to stay for long periods in a seated
position. Generally speaking, the slight S shape of the spine serves us well.
"If you think about a heavy weight on a C or S, which is going to collapse more
easily? The C," she says. But when you sit, the lower lumbar curve collapses,
turning the spine's natural S-shape into a C, hampering the abdominal and back
musculature that support the body. The body is left to slouch, and the lateral
and oblique muscles grow weak and unable to support it.
This, in turn, causes problems with other parts of the body. "When you're
standing, you're bearing weight through the hips, knees, and ankles," says Dr.
Andrew C, Hecht, co-chief of spinal surgery at Mount Sinai Medical Center.
"When you're sitting, you're bearing all that weight through the pelvis and
spine, and it puts the highest pressure on your back discs. Looking at MRIs,
even sitting with perfect posture causes serious pressure on your back."
Much of the perception about what makes for healthy and comfortable sitting has
come from the chair industry, which in the 1960s and '70s started to address
widespread complaints of back pain from workers. A chief cause of the problem,
companies publicized, was a lack of lumbar support. But lumbar support doesn't
actually help your spine. "You cannot design your way around this problem,"
says Cranz. "But the idea of lumbar support has become so embedded in people's
conception of comfort, not their actual experience on chairs. We are, in a
sense, locked into it."
In the past three decades the U.S. swivel chair has tripled into a more than $3
billion market served by more than 100 companies. Unsurprisingly, America's
best-selling chair has made a fetish of lumbar support. The basic Aeron, by
Herman Miller, costs around $700, and many office workers swear by them. There
are also researchers who doubt them. "The Aeron is far too low," says Dr. A.C.
Mandal, a Danish doctor who was among the first to raise flags about sitting 50
years ago. "I visited Herman Miller a few years ago, and they did understand.
It should have much more height adjustment, and you should be able to move
more. But as long as they sell enormous numbers, they don't want to change it."
Don Chadwick, the co-designer of the Aeron, says he wasn't hired to design the
ideal product for an eight-hour-workday; he was hired to update Herman Miller's
previous best-seller. "We were given a brief and basically told to design the
next-generation office chair," he says.
The best sitting alternative is perching -- a half-standing position at
barstool height that keeps weight on the legs and leaves the S-curve intact.
Chair alternatives include the Swopper, a hybrid stool seat and the funky, high
HAG Capisco chair. Standing desks and chaise longues are good options. Ball
chairs, which bounce your spine into a C-shape, are not. The biggest obstacle
to healthy sitting may be ourselves. Says Jackie Maze, the vice-president for
marketing at Keilhauer: "Most customers still want chairs that look like
chairs."
Recently Levine talked to Best Buy (NYSE:BBY - News), Wal-Mart (NYSE:WMT -
News), and Salo accounting about letting him design their offices and keep
people walking and working as much as possible. Levine jerry-rigged an old 1-
to 2-mph treadmill to stand under a desk and put a handful of them in
conference rooms. Those who wanted could have walking desks in their offices,
and he partnered with Steelcase to manufacture a $4,500 version of the machine.
"Within two weeks, people basically get addicted to walking and working," says
Levine. "You just need to give them the chance."