Their sleep/wake cycle lengthened suggesting the brain mechanism that controls the timing of activity and rest had been affected.
它们的作息周期变长，表明控制作息时间的大脑机能受到影响。
2
However, a comparison of the EKG measured during rest and the EKG measured after mild exercise may indicate the changes, if any, that take place in the cycle of heart contractions due to activity.