The heart rate and ventilatory responses to a fixed submaximal work rate are lower (i.e. ,lower heart rate and lower minute ventilation)following an endurance training program.This training-induced adaptation is primarily due to changes in the
A)central nervous system.
B)spinal cord.
C)trained skeletal muscles.
D)AV node

Question

Quizplus · Accepted Answer

The training-induced adaptation of lower heart rate and lower minute ventilation during submaximal exercise is primarily due to changes in the trained skeletal muscles. These changes include an increased ability of the muscles to extract oxygen from the blood and produce energy aerobically, which reduces the demand on the cardiovascular and respiratory systems. The central nervous system and spinal cord play a role in coordinating these responses but are not primarily responsible for the adaptations observed. The AV node, which regulates the timing of the heart's contractions, may be affected by training but is not the primary driver of the observed changes in heart rate.

The Heart Rate and Ventilatory Responses to a Fixed Submaximal