Exercise varies in intensity, endurance and many other factors which may vary from a short quick sprint, a long run, or a combination of different movements. Exercise requires effort which is provided by stored energy systems. What energy systems are used during exercise?Is there one system or multiple systems that help provide the energy needed during exercise. In general, quick and intense exercise lasting up to 30 seconds is provided by phosphocreatine . The first 2 seconds are provided by stored ATP in the muscle. This system combined is called the phosphagen system.
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