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lec_7_lab

# lec_7_lab - Measuring VO2 in the laboratory Two things will...

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Measuring VO 2 in the laboratory: Two things will be measured in lab today: External work (work done on the environment) Internal work (i.e., metabolic work, or energy expenditure). Open circuit indirect calorimetry (the measurement of VO 2 ). VO 2 max “aerobic capacity” – measure of the integrated functioning of the entire cardio- respiratory system at maximal exercise output.

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External work: W = F x D P = (F x D)/(time) On a cycle ergometer: Force is the resistance setting in kg Distance is the distance traveled by the flywheel = (revolutions) x (circumference of flywheel). Normally we give work as a “rate”, i.e., as a power unit: (rev/min.) x (circ. of flywheel) x F Example: (1 kg resistance) x (6 meters) x (60 rpm) = 360 kg/m/min. This can be converted into more familiar units: 1 kg/m/min = 0.16345 watts 1 kg/m/min = 0.00234 kcal On a treadmill?
Internal work (metabolic work) How is VO 2 measured?

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lec_7_lab - Measuring VO2 in the laboratory Two things will...

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