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Etymology: Gk, physis + logos, science; L, contractio, drawing together
a temporary condition in which muscles may contract and shorten for a considerable period. Drugs, temperature extremes, and local accumulation of lactic acid are possible causes.
A temporary condition in which tension and shortening of a muscle are maintained for a considerable time although there is no tetanus. It may be induced by injury, disease, heat, drug action, or acids.
See also: contracture