At the same walking speed after aerobic training, a client has a lower heart rate. What adaptation could contribute?
- AGreater stroke volume at that submaximal workload
- BA rise in maximal heart rate that lowers relative effort
- CReduced blood volume that eases cardiac workload
- DIncreased sympathetic drive at the same walking speed
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Answer
A
Aerobic training increases plasma volume and left-ventricular filling, raising stroke volume. Because submaximal cardiac output stays about the same, heart rate at the same walking speed falls.
B
Maximal heart rate is largely age-related and stays the same or falls slightly with training.
C
Endurance training expands blood (plasma) volume rather than reducing it.
D
Trained individuals show lower sympathetic drive at a given submaximal workload.
A
Aerobic training increases plasma volume and left-ventricular filling, raising stroke volume. Because submaximal cardiac output stays about the same, heart rate at the same walking speed falls.