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The soreness is caused by eccentric exercise, that is, exercise consisting of eccentric (lengthening) contractions of the muscle. Isometric (static) exercise causes much less soreness, and concentric (shortening) exercise causes none.elayed onset muscle soreness (DOMS), also called muscle fever, is the pain and stiffness felt in muscles several hours to days after unaccustomed or strenuous exercise. The soreness is felt most strongly 24 to 72 hours after the exercise.
This differs a bit from calf pain from causes other than cramping that results in muscle spasm. Exercise-related cramps are likely caused by muscle fatigue and may involve the Golgi tendon bodies, which normally fire to inhibit the muscle from contracting too hard. If the Golgi body fatigues, the nerve input to the muscle is overstimulated and the muscle cramps.