During prolonged, submaximal exercise, the majority of energy is derived fromthe aerobic energy system, the important substrates for oxidation beingcarbohydrates and lipids, with a small contribution from amino acids. Themeasurement of VO2 is a convenient way of assessing the metabolicrequirements of exercise. After a few minutes of exercise at a given poweroutput, a steady-state VO2 is attained where pulmonary VO2 essentiallyreflects the oxygen utilisation of the active tissues. At the onset of exercisethere is a slow increase in VO2 which is thought to be due to a slowadjustment in oxygen delivery to contracting muscle, but a lag in mitochondrialrespiration may also play a role. The difference between the measured VO2and the O2 demand of the workload (as measured by the steady-state VO2) istermed the oxygen deficit. Upon cessation of exercise, there is a gradualdecrease in VO2. The difference between the measured recovery VO2 and theresting VO2 has, in the past, been termed the oxygen debt, although inrecent years the term excess post-exercise oxygen consumption (EPOC) hasbeen preferred.1. Energy Expenditure (EE)EE = VO2 (L/min) x kcal equivalent (based on RER or RQ in table 8.1)EE = ____________ x_____________=_____________kcal/min2. Metabolic rate (MR)MR = EE / (Body surface area)= EE / (0.20247 x height0.725 x weight0.425)= ____________ / _______________=_________________kcal/m2/minAbove is an example of the power output and VO2 relationship graphLinear Equation (y=mx+c): ______________________
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