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Metabolic Rate Fitness Efficiency
Human Metabolism Metabolic Rate Fitness Efficiency
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Metabolism Internal energy comes from food
Oxidation of food supplies energy Energy goes into Internal functions External work Excess expelled as heat Rewrite in terms of rates U/t < 0 Must replenish U with food The metabolic rate (U/t) is the rate at which food and oxygen are converted to internal energy to balance loss through Q & W
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Metabolic Rate Metabolic Rate directly proportional to volume of oxygen consumed U/t in kcal/s VO2/t in L/s Can measure VO2/t to determine metabolic rate Can measure W/t to determine power output Use to find efficiency
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Basal metabolic rate is the rate when sleeping
Metabolic Rates p. 415 Basal metabolic rate is the rate when sleeping
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Physical (“Aerobic”) Fitness
Aerobic fitness is a measure of a person’s maximum capacity to use oxygen Increases with exercise Decreases without p. 416
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Efficiency Body does work can function as a machine
Define efficiency as before Affected by the type of work done p. 416
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