HRR after exercise is a prognostic marker; which statement is correct?

HRR after exercise is a prognostic marker; which statement is correct?

• A. It reflects how quickly the heart rate rises after exercise
• B. It reflects how quickly the heart rate declines after exercise
• C. It remains constant after training
• D. It is unrelated to cardiovascular prognosis

Answer: (B)

HRR measures the rate at which the heart rate falls after stopping exercise. This rapid decline is driven by reactivation of the parasympathetic (vagal) system, so a quick HRR indicates healthy autonomic balance and is linked to better cardiovascular outcomes. The statement that best fits is that HRR reflects how quickly the heart rate declines after exercise. It’s not about how fast the heart rate rises during exercise, and HRR can improve with training rather than remaining constant. It is also a prognostic marker—slower HRR is associated with higher risk.

HRR measures the rate at which the heart rate falls after stopping exercise. This rapid decline is driven by reactivation of the parasympathetic (vagal) system, so a quick HRR indicates healthy autonomic balance and is linked to better cardiovascular outcomes. The statement that best fits is that HRR reflects how quickly the heart rate declines after exercise. It’s not about how fast the heart rate rises during exercise, and HRR can improve with training rather than remaining constant. It is also a prognostic marker—slower HRR is associated with higher risk.