Kinesiology 3337A/B Lecture Notes - Lecture 2: Cellular Respiration, Lactic Acidosis, Vo2 Max
14 Sep 2016
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Document Summary
An australian study revealed major discrepancies between participant"s perceptions about sitting and the actual amount of time in which they were sedentary. Participants self-reported 200 minutes (3. 3hrs) a day sitting, but measurement devices recorded an average 500 minutes (8. 3hrs) a day spent sitting. Physical activity is the major challenge to homeostasis of the cellular environment. Walking at 5km/hr = 16-20-fold increase in o2 consumption in the muscles recruited. Low levels of energy expenditure can burn significant amounts of calories. Despite major acute changes in cellular respiration, external respiration increases with such precision there is little to no change in po2, pco2, and ph (steady state) The ratio, in steady state vco2 relative to vo2 defines the respiratory quotient (rq rer) of the muscle substrate (vco2 / vo2: rer gives indication of the substrate being used (carbs or fats) Effects of vet on vo2 and vco2 kinetics.
