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Medical Signing Lesson 10 Lifeprint.com. "Is Sitting a Lethal Activity?" By James Vlahos Published : April 14, 2011 in “The New York Times Magazine”. Why do some people who consume the same amount of food as others gain more weight?. - PowerPoint PPT PresentationTRANSCRIPT
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Medical Signing
Lesson 10Lifeprint.com
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"Is Sitting a Lethal Activity?" By James Vlahos Published: April 14, 2011 in “The New York
Times Magazine”
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Why do some people who
consume the same amount of food as others gain more
weight?
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Dr. James Levine, a researcher at the Mayo
Clinic in Rochester, Minn., is an expert in an
emerging field called "inactivity studies" which has challenged long-held
beliefs about human health and obesity.
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A weakness of traditional activity and
obesity research is that it relies on self-reporting — people’s
flawed recollections of how much they ate or
exercised.
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Dr. Levine conducted a series of studies
beginning in 2005 in which the caloric
intake and expenditures of
participants were scientifically assessed.
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Participants wore special skintight clothing
containing sensors and wires (accelerometers and inclinometers) that
assessed the participant's body movements -- twice a second, 24 hours a day.
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Participants consumed all of their food in the lab for
two months and were told not to exercise which
allowed Dr. Levine to carefully monitor "every
calorie" consumed as food or expended as
energy.
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After assessing how much food each of his
subjects needed to maintain their current
weight, Dr. Levine then required them to eat
an extra 1,000 calories per day.
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Some of his subjects packed on the pounds, while others gained little
to no weight.
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“We measured everything, thinking we were going to find some magic metabolic factor that would explain
why some people didn’t gain weight,” explains Dr. Michael
Jensen, a Mayo Clinic researcher who collaborated
with Dr. Levine on the studies.
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The researchers did not find any "magic" metabolic factor, but they kept looking for the reason why some people did not gain
weight.
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In 2011, with the help of motion-
tracking clothing the researchers discovered the
answer.
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“The people who didn’t gain weight were
unconsciously moving around more,” Dr. Jensen
says.
(They hadn’t started exercising more — that was prohibited by the
study.)
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When supplied with extra calories the "non-weight-
gainers" simply began making more little movements than
they had before the overfeeding began, like taking the stairs, trotting down the
hall to the office water cooler, bustling about with chores at
home or simply fidgeting.
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On average, the subjects who gained weight sat two hours more per day
than those who hadn’t.
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We used to believe that if you watch your diet and get aerobic exercise at
least a few times a week, you’ll offset your sedentary time.
[Evidence doesn’t support that idea.]
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“Exercise is not a perfect antidote for sitting,” says Marc
Hamilton, an inactivity researcher at the
Pennington Biomedical Research Center.
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The posture of sitting itself probably isn’t
worse than any other type of daytime
physical inactivity, like lying on the couch watching “Wheel of
Fortune.”
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But for most of us, when we’re awake and not moving, we’re
sitting.
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This is your body on chairs:
Electrical activity in the muscles drops — “the
muscles go as silent as those of a dead horse,” Hamilton
says — leading to a cascade of harmful metabolic effects.
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Your calorie-burning rate immediately
plunges to about one per minute, a third
of what it would be if you got up and
walked.
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Insulin effectiveness drops within a single day,
and the risk of developing Type 2
diabetes rises.
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The enzymes responsible for breaking down lipids and
triglycerides — for “vacuuming up fat out of the bloodstream,” as Hamilton puts it — plunge, which in turn causes the levels of good (HDL) cholesterol to
fall.
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Hamilton’s most recent work has examined how
rapidly inactivity can cause harm.
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In studies of rats that were forced to be inactive, for
example, he discovered that the leg muscles responsible
for standing almost immediately lost more than 75 percent of their ability to remove harmful lipo-proteins
from the blood.
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To show that the ill effects of sitting could have a rapid
onset in humans too, Hamilton recruited 14
young, fit and thin volunteers and recorded a
40 percent reduction in insulin’s ability to uptake glucose in the subjects —
after 24 hours of being sedentary.
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Over a lifetime, the unhealthful
effects of sitting add up.
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Alpa Patel, an epidemiologist at the
American Cancer Society, tracked the health of 123,000
Americans between 1992 and 2006.
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The men in the study who spent six hours or more per day of their leisure
time sitting had an overall death rate that was about 20 percent
higher than the men who sat for three hours or
less.
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The death rate for women who sat for more than six hours a day was about 40 percent higher. Patel estimates that on average, people who sit too much shave a few years off of their lives.
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A study conducted by David Dunstan and published in the journal Circulation in
2010, looked at nearly 9,000 Australians and found that for each additional hour of television a person sat and watched per day, the risk of dying rose by 11 percent.
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The purpose of the study was to analyze whether the people who sat watching
television had other unhealthful habits that
caused them to die sooner.
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But after crunching the numbers, Dunstan reported that “age, sex, education,
smoking, hypertension, waist circumference, body-mass
index, glucose tolerance status and leisure-time exercise did not significantly modify the
associations between television viewing and mortality.”
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Sitting, it would seem, is an independent pathology. Being sedentary for nine hours a day
at the office is bad for your health whether you go home
and watch television afterward or hit the gym. It is bad
whether you are morbidly obese or marathon-runner thin.
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“Excessive sitting,” Dr. Levine says, “is a lethal activity.”
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The good news is that
inactivity’s peril can be
countered.
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In a motion-tracking study, Dr. Levine found
that obese subjects averaged only 1,500 daily movements and nearly 600 minutes
sitting.
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Farm workers in Jamaica, average
5,000 daily movements and only 300 minutes
sitting.
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Dr. Levine coined a name for the concept of reaping
major benefits through thousands of minor
movements each day: NEAT, which stands for Non-Exercise Activity
Thermogenesis.
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Source: Vlahos, James (April 14, 2011), "Is Sitting a Lethal
Activity?", The New York Times Magazine, online at:
http://www.nytimes.com/2011/04/17/magazine/mag-
17sitting-t.html?_r=4&src=me&ref=homepa
ge
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