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Cardiocascular drift refers to the upward drift in heart rate and consequential downward drift in stroke volume (amount of blood pumped by the heart with each beat). This phenomenon occurs during prolonged steady-state exercise, particularly in the heat, and is due to the influence of increasing core temperature on dehydration and reduced plasma volume. Because HR increases and SV decreases, total cardiac output (amount of blood pumped per min- HR X SV) remains the same. However, one must still exercise at a lesser intesnity to avoid fatigue- near maximal heart rates are often observed during such occasions.

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