The program consisted of repeated intervals of three minutes of fast walking, aiming for an exertion level of about six or seven on a scale of one to 10, followed by three minutes of slow strolling. The results turned out to be very promising. As reported by the New York Times:1
“In their original experiment, the results of which were published in 2007, walkers between the ages of 44 and 78 completed five sets of intervals, for a total of 30 minutes of walking at least three times a week.A separate group of older volunteers walked at a continuous, moderate pace, equivalent to about a 4 on the same exertion scale.After five months, the fitness and health of the older, moderate group had barely improved. The interval walkers, however, significantly improved aerobic fitness, leg strength and blood-pressure readings.”
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