Are the three energy systems used sequentially?
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Interesting answers. Exercise biochemistry can be a complicated combination of pathways to produce ATP. It depends on the nature of the increase in exercise intensity. If one goes from resting to low intensity to moderate intensity to vigorous to max, the metabolic pathways will progress from aerobic (mitochondrial) to combined with glycolytic to creatine phosphate. However, if you get up out of your chair and sprint to the corner, the C-P system will kick in immediately. So the best answer I can give is “it depends.”
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