Exercise-induced Muscle Pain
Physical exercise may cause pain both as an immediate pain effect that may result from stimulation of free nerve endings by low pH, as well as a delayed onset muscle soreness. The delayed soreness is fundamentally the result of ruptures within the muscle, although apparently not involving the rupture of whole muscle fibers.
Read more about this topic: Exercise Physiology
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—Ralph Waldo Emerson (1803–1882)