Energy systems. Energy for muscular contraction during exercise comes from the splitting of a high energy compound (ATP). 3 systems – adenosine triphospate (ATP PC), Lactic acid system and the aerobic system
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Energy for muscular contraction during exercise comes from the splitting of a high energy compound (ATP).
3 systems – adenosine triphospate (ATP PC), Lactic acid system and the aerobic system
ATP stored in very small amounts in the muscles (enough to provide for maximal contraction for about 1 second.
All 3 energy systems are activated at the start of exercise, with the relative contribution being determined by the intensity and duration of exercise. All 3 work together.
3 basic pathways responsible for the resynthesis or rebuilding of ATP (energy supply). Depends upon : duration and intensity of exercise, how urgent energy is required, whether oxygen is present.
Stage 1 – fats and carbo’s broken down to release energy. Fats stored as triglycerides, are broken down releasing small amounts of energy for basic body functions and low intensity activities. Carbo’s (also used in lactic acid system) are used to provide energy in the aerobic system. Difference is that sufficient oxygen is supplied - glycogen broken down to glucose and pyruvic acid with energy made available for ATP resynthesis. (Aerobic glycolysis). No toxic waste ie lactic acid.