Recovery

DOMS: what muscle soreness actually tells you.

By Luigi · 5 min read

Two clients can do the same session and one wakes up barely able to sit down while the other feels fine. Neither of those outcomes tells me who trained "better". Soreness gets treated as a scorecard — no pain, no gain — and that's one of the more persistent myths I have to talk people out of.

Delayed onset muscle soreness (DOMS) is real and well documented. What it actually indicates is narrower than most people assume, and chasing it as a goal can quietly work against you.

What soreness actually is

A detailed review of the evidence describes DOMS as the result of microscopic damage to muscle fibres and connective tissue, usually from unfamiliar movements or unfamiliar amounts of eccentric (lengthening) load — think the lowering phase of a squat, or any exercise your body hasn't adapted to yet^[1]. That's the key word: unfamiliar. Soreness is largely a novelty response, not a growth dial you can turn up by trying harder.

Why it fades as you adapt — and why that's not a bad sign

The same review documents the "repeated bout effect": do a similar session again within a few weeks and the soreness is dramatically reduced, even though the training stimulus is just as real^[1]. If soreness measured effectiveness, your training would stop working as you got consistent. It doesn't — you keep progressing, you just stop waking up wrecked from the same exercises. Less soreness over time is adaptation working as intended, not a session gone soft.

The muscle-swelling complication

It gets more interesting here. Researchers tracking muscle size early in a training programme found that a meaningful chunk of the "growth" measured in the first couple of weeks wasn't new muscle tissue at all — it was swelling from the same damage-and-inflammation process that causes soreness^[2]. That cuts both ways: it means early soreness and early "pump" can overstate real progress, and it reinforces that soreness is a marker of disruption, not a direct measure of the muscle you're actually building over the following months.

Stretching won't save you from it

If you've ever stretched hard after a session hoping to head off next-day soreness — a Cochrane review pooling the trial evidence found stretching, before or after exercise, produces at most a trivial reduction in soreness, not a meaningful one^[3]. It's not harmful, but it's not the fix people treat it as either.

What actually helps, according to the evidence

A systematic review with meta-analysis pooling the trial evidence on recovery techniques found massage was the most consistently effective intervention for reducing soreness and perceived fatigue, with cold water immersion also showing a measurable benefit for inflammation markers^[4]. Neither is essential — soreness resolves on its own regardless — but if you want to actively speed up how you feel, those two have the best evidence behind them of the common options, ahead of stretching, foam rolling as a standalone fix, or supplements marketed for the purpose.

What I actually tell clients

• Soreness is feedback on novelty, not quality. A new exercise, a new rep range, or a longer layoff will make you sore regardless of whether the session was programmed well.
• No soreness doesn't mean a wasted session. Once your body adapts to a movement, you can keep progressing on it with little to no next-day soreness at all. That's the system working.
• Don't chase soreness on purpose. Deliberately hunting for maximum DOMS (random exercise variation every session, brutal eccentric overload) mostly just makes recovery harder without a clear return.
• Judge progress by the numbers, not the ache. Weight on the bar, reps completed, and how you look and feel over months — those are the real scoreboard.