Kinesiology 2230A/B Lecture Notes - Lecture 10: Vo2 Max, Pyruvic Acid, Glycogen

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Lactic acid concentration doesn"t increase until about 100 watts. What happens with a constant work rate? e. g. 50 watts. Oxygen consumption increases for a bit, and then reaches a steady state. Work rate at 150 watts: lactic acid is increasing. Takes a little bit longer, and doesn"t reach a steady state. We"re above lactate threshold, and o2 consumption will keep going up. We"re consuming more oxygen, and will need to produce more atp for the same power output. At 250 watts, o2 consumption will level o . Whats happened here is that the individual has reached their vo2 max, their upper limit of atp production in aerobic metabolism. At the lower work rates there was a continued increase in o2 consumption. Once they hit vo2 max, they can not get any more energy form aerobic metabolism. What is lactate? (lactic acid and lactate are not the same thing) Under cellular conditions, lactic acid loses an h+ and forms lactate.

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