ACE Personal Trainer Practice Exam

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What happens during vagal withdrawal?

Heart rate decreases significantly
Sympathetic nervous system is inhibited
Heart rate increases
Parasympathetic nerve fibers are activated

The correct answer is: Heart rate increases

During vagal withdrawal, there is an increase in heart rate. This physiological response occurs when the parasympathetic nervous system, which is primarily responsible for slowing down the heart rate via the vagus nerve, is inhibited or withdrawn. As a result, the influence of the sympathetic nervous system becomes more dominant, leading to an elevated heart rate. This can occur in various situations, such as during physical activity, stress, or other stimuli that demand increased cardiovascular output. In summary, vagal withdrawal contributes to an increase in heart rate as a result of decreased parasympathetic activity and heightened sympathetic dominance. This process is essential for preparing the body to respond to exertion or stress, making it a vital aspect of the body’s autonomic regulation.