UMass Amherst KIN 470 - Lab 2 Handout Submax VO2_adjusted (8 pages)

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Lab 2 Handout Submax VO2_adjusted



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Lab 2 Handout Submax VO2_adjusted

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Pages:
8
School:
University of Massachusetts Amherst
Course:
Kin 470 - Exercise Physiology

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LABORATORY 2 SUBMAXIMAL EXERCISE ENERGY EXPENDITURE AND RECOVERY IMPORTANT TERMS 1 2 3 Steady state oxygen consumption Oxygen deficit Excess post exercise oxygen consumption EPOC IMPORTANT CONCEPTS 1 2 3 Economy METS Work on the cycle ergometer INTRODUCTION This laboratory will investigate energy expenditure during submaximal cycle ergometry and recovery The concepts of steady state exercise oxygen deficit excess post exercise oxygen consumption and exercise economy will be covered in this lab Investigations of exercise frequently measure energy expenditure We are usually interested in comparing the energy cost of the same activity between individuals While performing exercise tasks that require some measure of skill or precision in execution experienced individuals will require less energy to complete a given task than unfit or less trained individuals Often it is said that the participant who uses less energy is the more efficient participant but this is a misuse of the term efficient Efficiency is defined in a physical sense as the amount of energy produced divided by the amount of energy consumed While efficiency would be an excellent tool for making comparisons in a practical sense it is impossible to measure efficiency in the lab as there is really no good method of determining work output exactly The best example of this is the case of a participant running on a treadmill While it is clear that the participant is expending a lot of energy and performing work to accelerate and decelerate in a strict sense no external work has been done because the participant s center of mass is in the same location as it was at the beginning of the test Devices such as the cycle ergometer provide a better estimate of work done but they still fail to measure internal work joint friction hemodynamic work etc as well as any energy lost in the driveline of the machine Therefore we are not actually measuring efficiency in the lab A more contemporary expression describing the



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