PHED-3126EL Lecture Notes - Lecture 6: Lactic Acidosis, Creatine Kinase, Anaerobic Glycolysis
28 Dec 2019
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Document Summary
Chapter 6 human energy transfer during physical activity. Atp-pcr system: used during short duration and high intensity activities (e. g. , 100/m sprint, thrusting a heavy weight upwards, quantity of intramuscular phosphagens influences all-out energy for brief durations, creatine kinase regulates phosphagen breakdown rate. Short-term glycolytic (lactic-forming) system: during intense activity, intramuscular stored glycogen provides energy to phosphorylate. Adp during glycogenolysis, forming lactate: performance of short duration high intensity requires rapid energy transfer that exceeds phosphagen supply, 400m sprint, 100m swim, multi-sprint sports. Aerobic activities produce cellular adaptations that increase rates of lactate removal, but only activities at higher intensities produces lactate accumulation: blood lactate accumulates only when its disappearance does not match its production rate. Blood lactate threshold (obla): blood lactate begins to increase exponentially: occurs at ~55% of max capacity for aerobic metabolism in healthy, untrained persons, occurs at higher percentage of endurance athlete vo2max. Specific sprint-power anaerobic training produces high blood lactate levels during max pa.
