Often the muscle soreness after a workout is at its greatest 24 to 48 hours after exercise and could persist for several days. Fatigue and soreness are caused by different muscle contraction types.
The culprit that causes muscle fatigue is constant muscle shortening (concentric contractions) that initiate limb movement. Concentric contractions need to overcome gravity. During a 30-minute run a person may contract their leg muscles 4500-5400 times depending on if stride-rate is 150 or 180 times a minute.
The sensation of fatigue is normally limited to the exercise bout and subsides once a person rests. The culprit for soreness is constant-muscle lengthening (eccentric contractions) rather than muscle shortening. Eccentric contractions enable lower the limb and are assisted by gravity. The forces generated by eccentric contractions are greater than concentric contractions as lowering the limbs has the additional effect of gravity.
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