Tag: Immediate energy system

The human body is remarkably efficient, but its most rapid energy comes from a system that lasts mere seconds. This initial, explosive fuel source, followed by the rapid breakdown of stored carbohydrates, provides the basis for answering the question: what is the body's main source of short-term fast energy?.

The human body has three primary energy systems, but the immediate energy system is the most rapid of all. Its purpose is to provide instant, explosive energy for short durations, as seen in maximal physical efforts lasting up to about 10-15 seconds. A prime example of the immediate energy system is a shot-put throw, which requires a single, maximal muscular contraction.