Cardiovascular drift
Cardiovascular Drift
Cardiovascular drift (pronounced: car-dee-o-vas-cu-lar drift) is a phenomenon observed during prolonged aerobic exercise where there is a progressive increase in heart rate and decrease in stroke volume. This occurs despite a constant exercise intensity.
Etymology
The term "cardiovascular" is derived from the Greek words kardia meaning heart and vasculum meaning little vessel. "Drift" in this context refers to the gradual change or shift in cardiovascular parameters over time during sustained exercise.
Description
During prolonged, steady-state exercise, especially in hot environments, cardiovascular drift is characterized by a gradual increase in heart rate and a decrease in stroke volume. This is due to an increase in body temperature and a decrease in plasma volume, among other factors. Despite these changes, cardiac output is often maintained.
Related Terms
- Aerobic Exercise: Physical exercise of low to high intensity that depends primarily on the aerobic energy-generating process.
- Heart Rate: The speed of the heartbeat measured by the number of contractions (beats) of the heart per minute (bpm).
- Stroke Volume: The amount of blood pumped by the left ventricle of the heart in one contraction.
- Body Temperature: The normal temperature of a human body.
- Plasma Volume: The volume of plasma in the blood. It decreases during cardiovascular drift due to sweating and other factors.
- Cardiac Output: The amount of blood the heart pumps through the circulatory system in a minute.
External links
- Medical encyclopedia article on Cardiovascular drift
- Wikipedia's article - Cardiovascular drift
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