B.ambitionmind
D.handsA.urgent
B.unnecessarycarefully
D.badly34.A.reminder
B.aid阅读理解even low levels of weekly exercise have major health benefits. In the study,
30 minutes of walking three days per week was enough to drive down blood pressure and improve overall fitness in a group of healthy sedentary (久坐的) adults. (最佳的)health,
adults are currently (适度的)exercise for at least five days of the week. But few people achieve this level of weekly activity,
often citing lack of time as the reason.
of the University of Ulster,
Northern Ireland,
and his colleagues designed a study to see if exercising at a level lower than currently recommended would improve overall fitness and heart health.
A total of 106 healthy but sedentary adults between the ages of 40 and 61 participated in the 12week study. The subjects were randomly (随机地) assigned a 30minute walk 3 days per week (44 subjects) or a 3minute walk 5 days per week (42 subjects),
while the remainder did not change their lifestyle(the nonwalking control group).
Tully's team found that blood pressure fell and waistlines and hiplines (臀围) reduced in size significantly in both the 3day walkers and 5day walkers. Overall fitness also increased in both walking groups. In contrast,
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