Fitness
Cardiac Drift
Cardiac drift is rising heart rate at the same easy pace as a long run progresses—often from heat, dehydration, or fatigue rather than loss of fitness. Some drift is normal; steep drift signals you started too fast or need fluids.
Cardiac drift is rising heart rate at the same easy pace as a long run progresses—often from heat, dehydration, or fatigue rather than loss of fitness. Some drift is normal; steep drift signals you started too fast or need fluids.
Compare drift across similar routes and conditions.
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