Short bursts of sprinting, known as "high intensity exercise",
can actually burn 200 calories, much more than jogging or walking for long
periods, according to a research.
Colorado State University researchers compared the energy expenditure of
a group of men on two different days: one spent watching TV, the other doing
high-intensity exercise followed by long periods of recovery.
To determine how many calories a typical sprint-interval training
workout might burn, research team leader Kyle Sevits and his colleagues at
Colorado recruited healthy male volunteers, aged between 25 and 31 years, the Daily
Mail reports.
Over three days, the men ate a diet calculated to give their bodies
exactly the right amount of calories, so they weren't over or under-eating. One
group then spent a day being sedentary, watching TV, while the other group
exercised.
This involved pedaling as fast as possible on an exercise bike set at a
high resistance (i.e. effort rate) for five 30-second periods. Each exercise
was separated by four-minute periods of recovery, in which they pedaled slowly
with very little resistance.
During the intense, 30-second bouts, researchers coached the volunteers
over an intercom system, encouraging them to give 100 percent effort.
On the sprint-interval workout day, the men burned an average of an
extra 200 calories, despite spending just 2.5 minutes engaged in hard exercise.
"Research shows that many people start an exercise programme but
just can't keep it up," said Sevits. "The biggest factor people quote
is that they don't have the time to fit in exercise," he added.
Times of India
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