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There are 3 types of muscle fiber contraction during exercise. 1) CONCENTRIC or “positive” contraction - shortening of the muscle fibers during contraction. The joint angle decreases between the proximal and distal attachments. 2) ISOMETRIC or “neutral” contraction - No change in the length of the muscle fibers during contraction. The joint angle does not change. 3) ECCENTRIC or “negative” contraction - lengthening of the muscle fibers during contraction. The joint angle increases between the pr

4.2K views · 161 reactions | 1. A muscle's contractile units lie...