ANP 1105 Lecture Notes - Lecture 6: Lactate Threshold, Cori Cycle, Myocyte

• School: University of Ottawa
• Department: Anatomy and Physiology
• Course: ANP 1105
• Professor: Joanne Savory

Document Summary

Weight lifting, diving, sprinting: atp & cp: short term energy. Tennis, soccer, 100m: almost entirely anaerobic: short term energy, uses glycogen. Marathon runs, jogging: mainly aerobic, but anaerobic may function until aerobic reaches full efficiency. Aerobic endurance: length of a time a muscle can use aerobic. Anaerobic threshold: point at which muscle converts to anaerobic. State of physiological inability to contract; results from a relative deficit of atp (total absence would cause contractures: ex of contractures: inability to relax muscles. Contributors: build-up of lactic acid, ion imbalances (na+/k+ requires atp!) Post exercise need to: replenish oxygen reserves, convert lactic acid to pyruvic acid, replace glycogen stores, restock atp and cp. Liver converts additional lactic acid to glycogen (cori cycle) Oxygen debt: extra amount of oxygen needed to be taken in to accomplish the above (lactic acid indirectly stimulates respiratory centre of brain) New term is excess post-exercise oxygen consumption (epoc) Atp-driven muscle contraction 20-25% efficient; dissipated by body"s cooling mechanisms.