Recovery

Should you train a muscle that is still sore?

Mild soreness is not a reason to skip a workout. Light training often makes it feel better, but sharp or one-sided pain is a different story.

Delayed-onset muscle soreness usually peaks one to three days after an unfamiliar or hard session and then fades on its own. It reflects microscopic disruption and inflammation in the muscle, and it is common after new exercises, a return from a break or a lot of lowering work. The question many people ask is whether training the same muscle again while it still hurts will slow recovery or cause injury.

For ordinary mild to moderate soreness, the answer is usually no. Research suggests that light to moderate exercise of a sore muscle does not worsen the damage, and the extra blood flow and movement often reduce the stiffness for a while. Performance may be somewhat lower, especially strength and power in the first one or two days, so a heavy record attempt is not a good idea. Training a different muscle group or doing easier sets with lighter weights, more warm-up and a full range of motion is a sensible compromise.

Soreness should feel diffuse, similar on both sides and better after warming up. Pain that is sharp, localized to one spot, gets worse during the set, comes with swelling or bruising, or follows a sudden pop is not normal soreness and deserves rest and, if it persists, a medical check. Extremely severe soreness with very swollen muscles and dark urine after an extreme session needs urgent medical attention. Over time, regular training makes soreness much milder, so do not chase it as a sign of progress.

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