"Most of us have heard that sitting is unhealthy," writes Gretchen Reynolds in last Sunday's New York Times Magazine. "But many of us also have discounted the warnings, since we spend our lunch hours conscientiously visiting the gym. We consider ourselves sufficiently active. But then we drive back to the office, settle at our desks and sit for the rest of the day. We are, in a phrase adopted by physiologists, 'active couch potatoes.'’’
In an article entitled "The Men Who Stare at Screens," Reynolds reports that "the physiological consequences (of sitting at a desk or computer all day) are only slowly being untangled.
"In a number of recent animal studies, when rats or mice were not allowed to amble normally around in their cages, they rapidly developed unhealthy cellular changes in their muscles. The animals showed signs of insulin resistance and had higher levels of fatty acids in their blood. Scientists believe the changes are caused by a lack of muscular contractions. If you sit for long hours, you experience no 'isometric contraction of the antigravity (postural) muscles,' according to an overview of the consequences of inactivity published this month in Exercise and Sports Sciences Reviews. Your muscles, unused for hours at a time, change in subtle fashion, and as a result, your risk for heart disease, diabetes and other diseases can rise."
In an unfortunate news for laptop potatoes everywhere, regular workouts do not seem to fully undo the hazardous effects of prolonged sitting.
‘‘There seem to be different pathways' involved in the beneficial physiological effects of exercising and the deleterious impacts of sitting," according to the University of South Carolina researcher who led the study. Says Tatiana Warren: ‘‘One does not undo the other."
Warren's suggestions for ameliorating the dangers of inactivity?
‘‘Look for ways to decrease physical inactivity,’’ beyond 30-minute bouts of jogging or structured exercise. Suggestions include:
- Stand up.
- Pace around your office.
- Get off the couch and grab a mop or change a light bulb the next time you watch ‘‘Dancing With the Stars.’’
Other suggestions, from me, include (i) manage your team, hospital, home, by walking around; and (ii) plan a San Diego beach vacation this summer and stop in at Medsphere in Carlsbad, for a beach-walk-and-talk with whomever you are here to collaborate with.
Click on Reynolds/Men Who Stare at Screens for the full article.