Chronological Time Versus Physiological Time
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If one were to ask a number of people what physiological rhythm they most closely associate with the passage of time, most would probably choose the heart rate. We are consciously aware of this pacemaker in quiet moments just prior to sleep, and we become acutely aware of it during exertion or when frightened or angry. Most students have probably estimated the number of times the heart will beat during a lifetime, and some people morbidly reflect on how many heartbeats have passed and how few remain.
KeywordsMetabolic Rate Caloric Restriction Basal Metabolic Rate Turnover Time Standard Metabolic Rate
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