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Overview Muscle contraction links excitationâcontraction coupling to sliding filament theory and clinical strength testing. Mechanism Motor unit recruitment, action potential, Ca²⺠release from SRCross-bridge cycling between actin and myosinTypes: isometric, isotonic (concentric/eccentric) Exam Tips Define latent period, contraction period, relaxation period on twitch curveRelate fatigue and muscle fibre types to exercise prescription