According to this study out of Ireland, subjects who walked 30 minutes on 3 times per week for 12 weeks averaged a 5 mm Hg drop in systolic blood pressure, a 2.6 cm drop in waist circumference, and a 2.4 cm drop in hip circumference. The numbers on subjects who walked 5 days a week were similar.
Here is another study that found no significant change in blood pressure, blood lipids, or girth measurements in previously sedentary adults who walked 20 minutes 3 days a week.
Obviously diet plays an important role in all of these parameters, however there seems to be evidence that you need to walk more than 60 minutes a week to experience some of these important health benefits.
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