Explain how the exercise pressor reflex is activated during exercise
Neural signals arising from the exercising muscle activate brain stem cardiovascular-control centers, resulting in an increase in blood pressure. During exercise, stimulation of group III afferent nerves, which are within the skeletal muscle and sensitive to stretch or pressure, and group IV afferent nerves, which are sensitive to chemicals, results in BP and HR increases via sympathetic activation and parasympathetic withdrawal, respectively. Progressive increases in workload result in progressive increases in activation of the exercise pressor reflex, resulting in directly related increases in HR and sympathetic activity, causing increases in BP.
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