Fifteen minutes into a 10 -km run, what is the major energy...

Fifteen minutes into a 10 -km run, what is the major energy source of the leg muscules?
a. Preformed ATP
$b .$ Glycolysis
$c .$ Oxidative metabolism
$d .$ Pyruvate and lactate
e. High-protein drink consumed right before the race

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Key Concepts

Oxidative Metabolism

Oxidative metabolism, or aerobic respiration, is a process that uses oxygen to convert substrates like carbohydrates and fats into ATP within the mitochondria. It is the dominant energy system for activities of moderate to long duration, such as a 10-km run, where the demand for ATP is sustained over time and oxygen is abundantly available.

Anaerobic Glycolysis

Anaerobic glycolysis is an energy pathway that rapidly generates ATP without the use of oxygen by breaking down glucose into pyruvate, and under limited oxygen, into lactate. While this process is crucial for high-intensity, short-duration activities, its contribution diminishes during prolonged exercise when oxidative metabolism takes over.

Energy Systems in Exercise

Human muscles use various energy systems to supply ATP during physical activity. The contribution of each energy system depends on the intensity and duration of the exercise. Short, high-intensity efforts primarily use immediate stored ATP and phosphocreatine, whereas longer activities rely on glycolysis and, eventually, oxidative metabolism for sustained energy production.

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