You finish a workout, wake up two days later barely able to sit down on the stairs, and think: that one worked. The soreness feels like proof. It’s the body’s receipt for a session well done. Except the research says that receipt is mostly measuring the wrong thing — and if you’re using next-day soreness to judge whether you trained well, you’re chasing a signal that doesn’t track the outcome you actually want.
This isn’t “soreness is bad.” Soreness is normal, usually harmless, and part of training. The point is narrower and more useful: how sore you get is a poor gauge of how good the workout was. Let’s go through what DOMS actually is, what it does and doesn’t tell you, and why occasionally it’s actively working against you.
What DOMS Actually Is
Delayed-onset muscle soreness — DOMS — is the stiffness and tenderness that shows up 12 to 24 hours after training, peaks around 24 to 72 hours, and fades by day 5 to 7. The key word is delayed: this isn’t the burn during a set, it’s the ache that arrives a day later.
The dominant explanation is the “popped sarcomere hypothesis,” first proposed by Morgan in 1990. Under high force — especially eccentric contractions, where the muscle lengthens under load (lowering a weight, running downhill) — individual sarcomeres get overstretched beyond their force-generating range and are mechanically disrupted. That damage releases calcium, activates protein-degrading enzymes, and triggers an inflammatory response. Macrophages arrive within about 24 hours; satellite cells (the muscle’s resident stem cells) activate to rebuild the fibers.[1]
Here’s the first clue that soreness is a messy signal: the physiological changes don’t move together. Force loss, swelling, blood markers of damage (like creatine kinase), and the soreness itself all follow different time-courses and don’t correlate cleanly with each other. Soreness peaks at 24–72 hours, while creatine kinase can peak days later, when the soreness is already fading. If soreness were a clean readout of muscle damage, these would track together. They don’t.[1],[2]
The Core Problem: Soreness Doesn’t Track Growth
The belief underneath “sore = good workout” is a logical chain: soreness means damage, damage means the muscle rebuilds bigger, so soreness means growth. Every link in that chain is weaker than it sounds — and the last one mostly breaks.
The definitive review on this is Schoenfeld and Contreras (2013) in the Strength and Conditioning Journal, which asked directly whether post-exercise soreness is a valid indicator of muscular adaptation. Their conclusion: it isn’t. Soreness is too heavily influenced by training novelty, individual pain perception, and connective-tissue involvement to serve as a proxy for the stimulus that drives growth.[3]
The research cuts several ways, all pointing the same direction:
• Weak correlation with damage itself: Nosaka and colleagues found perceived soreness correlates only weakly (r < 0.32) with other indirect markers of muscle damage. Big soreness can occur with little measurable damage — and vice versa.[4]
• Damage doesn’t predict growth: In Damas et al.’s longitudinal work, muscle damage was highest in the early weeks of a program — exactly when it was not linked to actual muscle growth. As lifters adapted and damage settled down, protein synthesis became the better predictor of mass gained.[5]
• Growth without soreness: Trained lifters build muscle with little to no soreness. Hypertrophy is driven primarily by mechanical tension and adequate volume — not by how much you ache afterward.[3]
Sources: Schoenfeld & Contreras, Strength Cond J 2013;35(5):16-21; Nosaka et al. 2002; Damas et al. 2016.A marathon leaves your legs wrecked for days.
It builds almost no muscle.
That’s the cleanest proof there is. Long-duration running and cycling produce significant DOMS — genuinely trashed legs — yet cause minimal hypertrophy.[3] If soreness reliably signaled growth, marathoners would be the most muscular athletes alive. They aren’t. Soreness and muscle building are simply measuring different things.
What Soreness Is Really Telling You: “That Was New”
If soreness isn’t a growth meter, what is it? Mostly, it’s a novelty meter. DOMS is most pronounced when you do something your body isn’t accustomed to — a new exercise, a big jump in volume, more eccentric loading than usual, or your first session back after time off.
The clearest demonstration is the repeated bout effect. Do a damaging workout, and you’re wrecked. Repeat that same workout a week or two later — and the soreness is dramatically less, even though you did the identical work. Your body adapts after a single exposure through neural, mechanical, and cellular changes.[6]
Think about what the repeated bout effect implies. If soreness meant a workout was productive, then the workout getting less sore over time would mean it’s getting less productive — which is backwards. The same session becomes less sore precisely as you get better at it. Soreness fades because you adapted, not because you stopped benefiting. Chasing soreness would mean constantly changing your training to stay unfamiliar with everything — which is a recipe for never getting good at anything.
When Chasing Soreness Actively Backfires
This is the part that matters most for athletes and active people, and it’s where “harmless” stops being the whole story. Deliberately hunting soreness doesn’t just fail to help — it can cost you.
DOMS comes with a measurable loss of force production. A muscle that’s sore and damaged produces less force, shows reduced activation, and has diminished range of motion for days.[2],[7] So if you train hard enough to be significantly sore, then train again through that soreness, you’re training in a compromised state:
Excessive soreness can reduce muscle activation and force capacity, interfere with the quality of your next session, and — because you’re compensating around sore tissue — change your mechanics in ways that raise injury exposure. For a golfer, a runner, a CrossFit athlete, “I was too sore to move well” isn’t a badge. It’s lost training quality.
“I’m crushingly sore, so that was a great workout and I’m building muscle.”
You did something unaccustomed. That’s all soreness reliably tells you — not whether the session drove adaptation.
“I’m not sore anymore, so I need to change things up to keep making progress.”
Less soreness means you adapted. Keep progressing load and volume — that’s what drives results, sore or not.
“No soreness means I wasted the session.”
Trained lifters grow with little to no soreness. Growth comes from tension and volume, not next-day ache.
So What Should You Actually Track?
Drop soreness as your scorecard and replace it with the variables that actually predict progress. This is what strength and conditioning coaches use, and it’s what the research points to:
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Progressive Load and Volume Over Weeks
Are you gradually lifting more, doing more quality work, or covering more distance at the same effort over a month or two? This is the real signal of a productive program.
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Performance Trending Up
Faster, stronger, more work at a given effort. Rising performance is the outcome soreness was falsely standing in for.
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Recovery Between Sessions
Are you showing up to the next session able to perform, or dragging? Quality across the week beats one heroic, wrecking workout.
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Ease Into New Stimulus
Starting something new? A lower-volume “prep phase” lets tissue acclimate and prevents the excessive soreness that compromises your next few sessions. Progress the volume after.
Normal DOMS is dull, symmetrical, tied to a new or hard session, and fades within a week. Be more cautious if soreness is severe, sharp, one-sided, accompanied by significant swelling, or paired with dark urine — that last combination can signal rhabdomyolysis, a medical emergency. And pain in a joint rather than the belly of a muscle isn’t DOMS at all. When soreness doesn’t fit the usual pattern, that’s a reason to get it looked at, not to push through.
The Bottom Line
Soreness tells you that you did something your body wasn’t used to. It does not tell you the workout was productive, and it does not tell you that you’re building muscle. Some of your best training sessions will leave you barely sore; some of your least productive (hello, first marathon) will wreck you for a week.
Train for progress, not for punishment. Judge your workouts by whether you’re getting stronger, faster, and more capable over weeks — not by how hard it is to walk down the stairs tomorrow.
Training Hard but Not Progressing?
If soreness is the only thing your training is reliably producing — or the same aches keep recurring — that’s worth an assessment. We help athletes train smarter, recover better, and find what’s actually limiting progress.
Book an Assessment ?References
- Morgan DL (popped sarcomere hypothesis, 1990); mechanistic reviews of DOMS describing eccentric damage, calcium release, macrophage and satellite cell response, and the mismatched time-courses of soreness, force loss, and creatine kinase. See also Proske & Morgan, J Physiol 2001;537:333-345. PubMed
- Reviews of exercise-induced muscle damage documenting decreased force production, reduced range of motion, swelling, and stiffness following unaccustomed (especially eccentric) exercise, with symptom time-courses that do not align. PMC
- Schoenfeld BJ, Contreras B. Is postexercise muscle soreness a valid indicator of muscular adaptations? Strength and Conditioning Journal. 2013;35(5):16-21. doi:10.1519/SSC.0b013e3182a61820. (Concludes DOMS is not a valid indicator of muscle damage or growth; notes marathon/endurance soreness without hypertrophy, and large interindividual variability.) Strength & Conditioning Journal
- Nosaka K, et al. (2002). Perceived soreness shows only weak correlation (r < 0.32) with other indirect markers of muscle damage such as strength loss, range of motion, and creatine kinase.
- Damas F, et al. Resistance training-induced changes in integrated myofibrillar protein synthesis are related to hypertrophy only after attenuation of muscle damage. Journal of Physiology. 2016;594(18):5209-5222. (Damage was highest early and not linked to eventual hypertrophy; protein synthesis became predictive once damage attenuated.) PubMed
- McHugh MP and others on the repeated bout effect: a single bout of eccentric exercise attenuates soreness and damage from subsequent bouts via neural, mechanical, and cellular adaptations. PMC
- Flann KL, et al. (2011); Peake JM, et al. (2017). Hypertrophy and strength increases can occur largely independent of soreness and symptomatic damage, driven by mechanical tension and volume; training through significant soreness can reduce activation and impair subsequent performance.
This article is for general educational purposes and does not constitute medical advice. Severe, sharp, or one-sided muscle pain, significant swelling, or soreness with dark urine should be evaluated promptly by a healthcare provider.
