In a study called Leisure Time Physical
Activity and Mortality: A Detailed Pooled Analysis of the Dose-Response Relationship, found that by meeting the 2008 Physical Activity Guidelines for
Americans minimum by either moderate- or vigorous-intensity activities was
associated with nearly the maximum longevity benefit.
The study authors observed a benefit threshold
at approximately 3 to 5 times the recommended leisure time physical activity
minimum and no excess risk at 10 or more times the minimum. In regard to
mortality, health care professionals should encourage inactive adults to perform
leisure time physical activity and do not need to discourage adults who already
participate in high-activity levels
Researchers pooled data from 6 studies in the
National Cancer Institute Cohort Consortium (baseline 1992-2003).
Population-based prospective cohorts in the United States and Europe with
self-reported physical activity were analyzed in 2014.
A total of 661,137 men and
women (median age, 62 years; range, 21-98 years) and 116 686 deaths were
included. Median follow-up time was 14.2 years
Using this data, the researchers stratified the adults by
their weekly exercise time, from those who did not exercise at all to those who
worked out for 10 times the current recommendations or more (meaning that they
exercised moderately for 25 hours per week or more).
They found that, unsurprisingly, the people who did not
exercise at all were at the highest risk of early death.
But those who exercised a little, not meeting the
recommendations but doing something, lowered their risk of premature death by
20 percent.
Those who met the guidelines precisely, completing 150
minutes per week of moderate exercise, enjoyed greater longevity benefits and
31 percent less risk of dying during the 14-year period compared with those who
never exercised.
The
sweet spot for exercise benefits, however, came among those who tripled the
recommended level of exercise, working out moderately, mostly by walking, for
450 minutes per week, or a little more than an hour per day. Those people were
39 percent less likely to die prematurely than people who never exercised.
At that point, the benefits plateaued, the researchers
found, but they never significantly declined. Those few individuals engaging in
10 times or more the recommended exercise dose gained about the same reduction
in mortality risk as people who simply met the guidelines. They did not gain
significantly more health bang for all of those additional hours spent
sweating. But they also did not increase their risk of dying young.
The other new study Effect
of Moderate to Vigorous Physical Activity on All-Cause Mortality in Middle-aged
and Older Australians. reached a somewhat similar conclusion about
intensity. While a few recent studies have intimated that frequent, strenuous
exercise might contribute to early mortality, the new study found the reverse.
For this study, Australian researchers closely examined
health survey data for more than 200,000 Australian adults, determining how
much time each person spent exercising and how much of that exercise qualified
as vigorous, such as running instead of walking, or playing competitive singles
tennis versus a sociable doubles game.
The researchers concluded that among people reporting any
activity, there was an inverse dose-response relationship between proportion of
vigorous activity and mortality. The findings suggest that vigorous activities
should be endorsed in clinical and public health activity guidelines to
maximize the population benefits of physical activity.
They found that meeting the exercise guidelines
substantially reduced the risk of early death, even if someone’s exercise was
moderate, such as walking.
However if someone engaged in even occasional vigorous
exercise, he or she gained a small but not unimportant additional reduction in
mortality. Those who spent up to 30 percent of their weekly exercise time in
vigorous activities were 9 percent less likely to die prematurely than people
who exercised for the same amount of time but always moderately. Those people who
spent more than 30 percent of their exercise time in strenuous activities
gained an extra 13 percent reduction in early mortality, compared with people
who never broke much of a sweat. The researchers did not note any increase in
mortality, even among those few people completing the largest amounts of
intense exercise.
The bottom line is that anyone who is physically capable (always
check with your doctor before starting) of activity should try to reach at
least 150 minutes of physical activity per week. Of those minutes around 20 to
30 minutes of that should be vigorous activity.
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