Study found risk of early death dropped when
physical activity levels went up
Just one
hour of physical activity a day -- something as simple as a brisk walk or a
bicycle ride -- may undo the increased risk of early death that comes with
sitting eight hours or more on a daily basis, a new study suggests.
"These
results provide further evidence on the benefits of physical activity,
particularly in societies where increasing numbers of people have to sit for
long hours for work or commuting," said lead researcher Ulf Ekelund. He is
a professor in physical activity and health at the Norwegian School of Sport
Sciences in Oslo, Norway.
"Unfortunately,
only 25 percent of our sample exercised an hour a day or more," he said.
The study
also found that watching TV for three hours or more a day was linked with an increased
risk of early death, regardless of physical activity -- except among those who
were the most physically active.
However,
even among those who exercised the most, the risk of premature death was
significantly increased if they watched five hours of TV a day or more, the
researchers added.
It's not
TV, per se, that is associated with an increased risk of dying early; rather,
TV is a marker for sitting and not being active, Ekelund said.
In their
review of 16 previously published studies that included more than one million
people, the researchers divided the participants into four groups: those who
got about 5 minutes of moderate-intensity exercise a day; 25 to 35 minutes a
day; 50 to 65 minutes day; and 60 to 75 minutes a day.
The
increased risk of early death ranged from 12 percent to 59 percent, depending
on how much exercise the participants got, the findings showed.
"Indeed,
those belonging to the most active group, and who are active about 60 to 75
minutes per day, seem to have no increased risk of mortality, even if they sit
for more than eight hours a day," Ekelund said.
"Sit
less, move more, and the more you move the better," he suggested.
The
report, which did not prove that inactivity caused early death, was published
online July 27 in The Lancet.
According
to Dr. David Katz, president of the American College of Lifestyle Medicine,
"This important analysis fortifies the increasingly clear verdict from a
large and growing body of evidence addressing physical activity and health: all
movement is good movement."
Evidence
is clear that moderately vigorous exercise has an array of health benefits,
Katz said.
"If
you don't exercise but can stand often, do. If you can't stand often but can
exercise, do," he added. "Better still, do both. It's clear: all
movement is good movement."
Not only
does physical inactivity increase the risk of early death, it's expensive,
according to another study published in the same journal issue.
In that
study, researchers estimated the cost of being physically inactive based on the
increased risk for type 2 diabetes, heart disease, stroke, and breast and colon
cancer. In 2013 dollars, the study authors estimated that inactivity costs the
United States about $28 billion annually.
"The
current economic cost of physical inactivity is borne mainly by high-income
countries. However, as low- and middle-income countries develop, and if the
current trajectory of inactivity continues, so too will the economic burden in
low- and middle-income countries who are currently poorly equipped to deal with
chronic diseases linked to physical inactivity," study author Dr. Melody
Ding, of the University of Sydney in Australia, said in a statement.
Steven
Reinberg
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