Muscle cells use four systems that coordinate to create (synthesize) ATP to fuel the body. These systems have different metabolic processes, different fuel sources, and vary in the type of physical activity (intensity and duration) to which they contribute. ATP–CP (phosphagen) system Anaerobic (glycolytic) system Aerobic (glycolytic) system Fatty acid oxidation system
Working with a professional who understands these systems is vital to a training plan that takes account of appropriate rest periods and targeted energy systems during different workouts for maximum results.
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