Physical therapy
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Review
Injury to skeletal muscle fibers during contractions: conditions of occurrence and prevention.
Contraction-induced injury results in the degeneration and regeneration of muscle fibers. Of the three types of contractions--shortening (concentric), isometric, and lengthening (eccentric)--injury is most likely to occur and the severity of the injury is greatest during lengthening contractions. ⋯ The recovery from contraction-induced injury is usually complete within 30 days. Repeated exposures to protocols of lengthening contractions result in "trained" muscles that are not injured by the protocol that previously caused injury.