What effect does a beta-blocker have during exercise?

A beta-blocker is a medication that works by inhibiting the effects of epinephrine and norepinephrine on beta-adrenergic receptors. This leads to a reduced response of the heart during physical activity. Specifically, during exercise, individuals taking beta-blockers experience a blunted heart rate response. Normally, during exercise, heart rate increases to meet the heightened demand for oxygen and blood flow in the muscles; however, beta-blockers attenuate this natural heart rate increase.

This medication is primarily used to manage conditions such as hypertension, anxiety, and certain arrhythmias. By reducing heart rate and the overall workload on the heart, beta-blockers can help in managing these conditions, particularly under physical stress. Therefore, the correct answer highlights the expected physiological change when a person on beta-blockers engages in exercise.