Cardiac drift is the phenomenon where heart rate increases over the course of prolonged exercise in response to blood volume loss from sweating, reducing the amount of blood available to pump oxygen and energy to muscles, forcing the heart to compensate by increasing rate.
causalpending
Evidence Quote
“as we exercise our heart rate does drift out and it drifts out in response primarily to the fact that we are losing blood volume when we sweat so as we sweat to cool down that water has to come from somewhere and it typically comes from our Central blood volume”
Created: 8/13/2026, 10:26:22 AM
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