A healthy 40-year-old female subject comes to the exercise laboratory. Her heart rate at rest is about 65 beats/minute: systole lasts 350 msec, diastole lasts 570 msec. Four minutes after starting an interval exercise program on a stationary bicycle, her heart rate is 130 beats/minute. You estimate that the duration of: a. systole decreases to less than 100 msec. b. systole increases to about 390 msec. c. diastole stays about the same. d. diastole decreases to about 200 msec.

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