Human Orcadian Rhythms in Resting and Exercise Pulse Rates

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Abstract
Circadian rhythmicity in resting, exercise and recovery pulse rates was studied using five male subjects. Resting pulse rate data were collected at seven seperate times during a 24 hour period. Exercise and recovery pulse rate data were collected at the exact same limes, as follows: 0400, 0800, 1200, 1500, 1800, 2100 and 2400 h. The lowest resting pulse rates for all subjects occurred between 0400 and 0800 h; highest resting pulse rates occurred between 1800 and 2400 h. Exercise pulse rates followed this same general pattern, and tended to amplify the circitdiun rhythmicity.

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