KAAP430 Chapter Notes - Chapter 5: Basal Metabolic Rate, Aerobic Exercise, Calorimetry
21 Mar 2017
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Energy used by contracting muscle fibers during exercise cannot be directly measured. 40% energy liberated from glucose metabolism atp. 60% energy liberated from glucose metabolism lost to heat. Measures rate & quantity of energy production. Heat produced by body walls warms water. Can calculate metabolism by measuring changes in air temperature. Provides accurate measurement of total body energy expenditure over time . Useful for measuring energy expended during prolonged, steady-state aerobic exercise. Cannot follow rapid changes in energy expenditure. Equipment used generates heat must be accounted for in calculations. Rate of o2 & co2 exchanged in the lungs = usage & release by body tissues. Energy expenditure measured by respiratory exchange of o2 & co2. Most accurate if energy production is almost completely oxidative. Respiratory gas exchange determined through volumes of o2 & co2 that enters & leaves the lungs during a given period of time.
