cardiac drift
Progressive increase in heart rate during prolonged exercise at steady workload.
Full Definition
Cardiac drift refers to the gradual, progressive increase in heart rate that occurs during sustained exercise despite maintaining a constant workload and oxygen consumption. This phenomenon typically begins after 10-15 minutes of continuous activity and is attributed to rising core body temperature, dehydration, and decreased stroke volume. In sports cardiology, understanding cardiac drift is essential for accurate interpretation of exercise testing results and for developing appropriate training prescriptions. The magnitude of drift can indicate an athlete's fitness level and heat acclimatization status, with well-trained individuals showing less pronounced drift patterns.
Usage
Usage note: Use consistently without hyphenation when referring to the physiological phenomenon.
In Context
- "The endurance cyclist exhibited minimal cardiac drift during the three-hour time trial, indicating excellent fitness." — performance analysis
- "Researchers measured cardiac drift to assess the effectiveness of the heat acclimatization protocol." — research paper