[the] routine involved one minute of strenuous effort, at
about 90 percent of a person’s maximum heart rate , followed by
one minute of easy recovery. The effort and recovery are repeated 10
times, for a total of 20 minutes. Despite the small time
commitment of this modified HIIT program, after several weeks of
practicing it, both the unfit volunteers and the cardiac patients showed
significant improvements in their health and fitness.
http://well.blogs.nytimes.com/2012/02/15/how-1-minute-intervals-can-improve-our-health/
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