What is one important reason for including a cool-down period in cardiac rehabilitation?

Including a cool-down period in cardiac rehabilitation is crucial for attenuating the catecholamine response. During exercise, the body increases the production of catecholamines, which are hormones released from the adrenal glands in response to stress, including physical activity. These hormones, such as adrenaline and norepinephrine, elevate heart rate and blood pressure, preparing the body for intense physical demands.

After intense exercise, a sudden cessation can lead to a rapid drop in heart rate and blood pressure, potentially causing dizziness, fainting, or other cardiovascular issues. A cool-down period helps gradually lower the heart rate and helps the body transition back to a resting state, moderating the catecholamine levels and ensuring a safe recovery. This controlled decrease in physiological stress supports cardiovascular health and is especially important in individuals undergoing cardiac rehabilitation, who may have compromised heart function.

While reducing muscular soreness, enhancing flexibility, and increasing exercise intensity can all be benefits associated with various exercise practices, they do not directly address the immediate cardiovascular safety and response to exercise that the cool-down specifically targets.