SAR HS 342 Lecture Notes - Lecture 1: Calorimetry
31 Dec 2018
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Ergometry: measurement of work outputs, ergometer: device used for measurement (note: cannot calculate vo2 on treadmill without vertical incline, which tells you the vertical displacement) Work vs. energy expenditure: work: quantifying outputs, energy expenditure: quantifying inputs, these are opposites. Calorimetry: measurement to quantify energy expenditure, direct calorimetry: measurement of heat production, heat rises in proportion to energy expenditure. Indirect calorimetry: measurement of oxygen consumption: oxygen consumption rises in proportion to energy expenditure. Relative vo2 vs. absolute vo2: relative (ml/kg/min) takes into account a person"s body weight and is comparable, absolute (l/min) is unique to the individual and is not comparable. Mets: 1 met = 3. 5 vo2: unit of resting metabolic rate (rmr) Factors influence energy efficiency: work rate: work rate increases = efficiency decreases, speed of movement: any deviation from optimal speed = efficiency decreases, muscle fiber type: more slow-twitch fibers = efficiency increases.
