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  3. Fifty volunteers were alphabetically divided into two equal groups, Group A

Fifty volunteers were alphabetically divided into two equal groups, Group A

游客2025-03-21  50
问题     Fifty volunteers were alphabetically divided into two equal groups, Group A to participate in a 7 weeks exercise program, and Group B to avoid deliberate exercise of any sort during those 7 weeks. On the day before the exercise program began, all 50 men participated in a step-test. This consisted of stepping up and down on a 16-inch bench at 30 steps a minute for 5 minutes.
    One minute after completion of the step-test, the pulse rate of each subject was taken and recorded. This served as the pretest for the experiment. For the next 7 weeks, subjects in the experimental group (Group A) rode an Exercycle (a motor-driven bicycle-type exercise machine) for 15 minutes each day. The exercise schedule called for riders to ride relaxed during the first day’s ride, merely holding on to the handle bars and foot pedals as the machine moved. Then, for the next 3 days, they rode relaxed for 50 seconds of each minute, and pushed, pulled, and pedaled actively for 10 seconds of each minute. The ratio of active riding was increased every few days, so that by the third week it was half of each minute, and by the seventh week the riders were performing 15 solid minutes of active riding.
    At the end of the 7 weeks, the step-test was again given to both groups of subjects, and their pulses taken. The post-exercise pulse rates of subjects in the experimental group were found to have decreased an average of 30 heart beats per minute, with the lowest decrease 28 and the highest decrease 46. The pulse rates of subjects in the control group remained the same or changed no more than 4 beats, with an average difference between the initial and final tests of zero. [br] The post-exercise pulse rates of Group B were found on the average to have______.
选项 A、not changed
B、gone down 28 beats per minute
C、gone down 30 beats per minute
D、gone down 4 beats per minute
答案 A
解析 这也是一道细节题。文中第二段倒数第一句中说：“在实验的对照组中，成员的脉搏跳动率前后保持一样或者脉搏跳动的变化数没有超过四下。”因此选项A正确。解答此题的关键是：应注意文中对两个实验小组的提法，即Group A—the experimental group(实验组)和Group B一the control group(实验的对照组)。两组中的Group B，文中说“remained the same”，这与选项A中“not changed”的意思相同。
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