Abstract
Previous studies evaluating heart rate recovery following treadmill test have significant limitations. We evaluated heart rate recovery pattern in ninety five normal individuals of both genders and different age groups after strictly excluding any cardiac or systemic illness. We observed three distinct patterns of heart rate recovery. Some individuals had significant fall in heart rate during the first minute of recovery. Second group had greater reduction in heart rate during second and third minute of recovery. The third group had nearly similar fall in heart rate during first minute of recovery and during next two minute. However all individuals had a reduction of fifty beats per minute or more during initial three minutes of recovery. Subsequently reduction in heart rate was very slow. None of the individuals reached pre-exercise heart rate up to the end of seven minutes of recovery. Our observations will help better planning of future studies trying to correlate significance of heart rate recovery with diagnosis or prognosis.
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