Fast and slow fibers in human muscles.
D000818:Animals; D001001:Anura; D004558:Electric Stimulation; D005221:Fatigue; D006244:Hardness; D006801:Humans; D009119:Muscle Contraction; D009132:Muscles / Q000502:physiology*; D009210:Myofibrils / Q000502:physiology*; D005082:Physical Exertion; D013997:Time Factors