After a work-set is terminated and blood flow is returned to the target muscle, spent ATP and CP must be replaced. For each 30 seconds of rest, 50% of the remaining spent ATP and CP, is replaced. This means that it takes 30 seconds to replace 50%, 60 seconds to replace 75%, 90 seconds to replace 87%, and 120 seconds to replace 94% of the ATP/CP used during a work-set or anaerobic activity. For these percentages to apply, a total rest period for the target muscle must be utilized. This is because even low-moderate intensity activity requires ATP and will slow the process of ATP/CP replacement. Unfortunately, lactic acid build up can hinder ATP formation, too.
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