29. During high intensity, short-duration exercise (weight lifting, for example), fatigue is believed to be partially caused by: The decrease in extracellular Calcium caused by sweating_ The increase in extracellular Potassium and increase in intracellular ADP caused by the activity of the muscle fibers. The decrease in localized temperature that occurs in active muscle fibers. D The decrease in intracellular Sodium caused by the Action Potential_
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