KINESIOL 2F03 Lecture Notes - Lecture 9: Myocyte, Anaerobic Glycolysis, Creatine Kinase

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Maximal effort lasting 3 180 seconds. First 3 seconds near maximal effort: nearly 100% local energy turnover. At first 90 seconds anaerobic contribution ~ 50% energy from anaerobic metabolism: replenish muscle stores of atp. Energy production: short term: 3-10 seconds, intermediate: 20-50 seconds, long term: 60-120 seconds, wind gate: short to intermediate, four energy pathways. Adp + creatine phosphate atp phosphorylation (creatine kinase) requires enzymes: have to make atp before breaking it down. Anaerobic glycolysis: glycogen/glucose atp (lactate production) Aerobic glycolysis (kreb"s cycle/citric acid cycle: fatty acids/glucose/ glycogen + 02 atp. Overall message: complexity increases while atp production speed decreases. Performance related to ffm and muscle size. Muscle fibre type: high fast twitch muscle fibre content (cross bridges move quick for rapid energy production) Accumulation of metabolic by-products: lactate production h+ ph decreases exhaustion. Oxygen delivery, substrate availability and neuromotor control = no great influence. Step test short term energy production, sensors on steps measure time.

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