Where are you right now? Lounging on an overstuffed couch with the newspaper and a cup of coffee? Sitting on a kitchen chair taking in the news online? Good thing you're sitting down for this bit of news. (Or maybe you should stand.)
Your chair is slowly killing you.
Chair disease, as we like to call it, is an increasingly common malady in the United States that is almost always caused by spending too much time parked on your rear end.
It's not really the chair's fault, though. The problem is that most of us sit wrong — slouched forward with our earlobes in front of our shoulders — and for hours without moving. The result? Avoidable chair-related ailments, including flabby butts, an increased risk of blood clots, and back pain, the leading cause of disability in Americans younger than 45. If you haven't had back pain yet, just wait; it affects 8 out of 10 people at some point during their life, according to the National Institutes of Health.
"Sitting all day is the worst thing in the world you can do for your back," said Dr. Joel Press, the medical director of the Spine & Sports Institute at the Rehabilitation Institute of Chicago.
Sitting puts nearly twice the stress on the spine as standing; slouching while you sit increases the pressure even more.
That's because hunching forward pushes the back into a convex or C shape. Try it. Now pull your shoulders back and together and put your hand on your lower back. That natural concave curve is what you want; slouching fatigues and overstretches the ligaments, causing back pain.
To make matters worse, we stay in this bad C position for hours, barely moving, even when nature calls. Movement is key, because the disks in our vertebrae are important shock absorbers. When we're locked in one position, we're starving the disks of nutrients.
"There's no vascular or nerve supply to the disks; they get their nutrition through movement," said Press. "If we're not moving, everything stagnates."
Sitting also tightens and shortens the psoas — the strong hip flexor — which can affect how the pelvis rotates and increase the load on the lower back. If you've ever run on a treadmill at lunch and then returned to your desk, you know hamstrings also tighten when we sit.
The gluteal muscles, meanwhile, stretch out, but they're not being used so they turn off and get weaker (flabbier!) from sitting.