![]() ![]() ![]() These hormones build up in your bloodstream and cause your heart rate to gradually increase as you continue to exercise. Exercise stimulates your sympathetic nervous system, which then activates the release of norepinephrine and epinephrine, Comana explains. To make up for this decreased stroke volume, your heart rate increases so that cardiac output can stay the same.Ĭardiac drift can also be chalked up, in part, to hormones. The primary one is that when you exercise, your body is trying to maintain cardiac output, which is basically how much blood the heart can pump out to the rest of the body, says Singh.Ĭardiac output is driven by two things: heart rate and stroke volume (essentially the amount of blood your heart can pump out with each beat).Īs you exercise, your stroke volume may decrease due to fluid loss caused by sweating, as well as muscle pump (basically, your muscles contracting), Comana explains. ![]() There are a few different physiological effects that explain cardiac drift, says Comana. ![]()
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