What is DOMS?
DOMS stands for Delayed Onset Muscle Soreness. It's that achy, stiff, tender feeling you get in your muscles — usually starting the day after a hard training session, and often peaking on day two.
If you've ever woken up the morning after a tough cheer practice and thought "why does everything hurt when I try to sit down," — that's DOMS. It's incredibly common. It's normal. And despite how it feels, it is not a sign that something is wrong.
when it typically peaks
usually fully resolves
DOMS at some point
Imagine your muscles are like a brand new pair of shoes. When you first wear them, they rub and feel uncomfortable. Your body is saying "we haven't done this before — let me adjust." DOMS is your muscles doing exactly that. They're being stretched and worked in a new way, and they're letting you know about it while they adapt.
Why does it happen?
For a long time, people thought DOMS was caused by lactic acid — that burning feeling you get during exercise. We now know that's not true. Lactic acid clears from your muscles within about an hour of finishing training.
What actually causes DOMS is a combination of microscopic damage to muscle fibres and the body's inflammatory response to that damage. Not the kind of damage that means something is broken — the kind that's a completely normal part of how muscles grow and get stronger.
Micro-tears in muscle fibres
When you train — especially with new movements, heavier loads, or more reps than usual — tiny tears form in the muscle fibres. These are microscopic and harmless.
Inflammation response
Your body detects the damage and sends fluid and immune cells to the area to start repairing it. This causes swelling, warmth, and the aching sensation you feel.
Repair and rebuild
Over the next few days, your body repairs those micro-tears and builds the fibres back slightly stronger than before. This is literally how muscle is built.
The result
After the soreness clears, those muscles are more prepared for the same type of effort. That's the adaptation — you come back stronger, and the same workout causes less soreness next time.
Eccentric movements cause the most DOMS. Eccentric just means the muscle is working while it's lengthening — like the lowering phase of a squat, landing from a jump, or slowly lowering out of a handstand. These create more micro-tears than concentric (shortening) movements, which is why leg day and jump-heavy cheer training often hits hardest the next morning.
When does it start —
and how long does it last?
This is the part that confuses a lot of people. DOMS doesn't start during training, or even right after. It creeps in later — which is why it's called delayed onset.
You feel the burn — not DOMS
That burning sensation during exercise is metabolic fatigue and lactic acid. It clears within 30–60 minutes of finishing. Not DOMS.
Mild stiffness begins
Some athletes notice the first hints of soreness starting. Muscles may feel slightly tight or heavy. Often barely noticeable at this stage.
Soreness kicks in properly
Most athletes start to feel it here. Muscles are tender to touch, stiff when you first move, and achy with certain movements. The classic "I can't walk down stairs" moment.
Usually the worst it gets
Day two is typically peak DOMS. The inflammation response is at its highest. This is normal — it doesn't mean you've done more damage. It just means the repair process is in full swing.
Gradual improvement
Most athletes feel significantly better by day three. Stiffness eases, tenderness reduces, and normal movement returns. Light activity can speed this up.
Fully resolved
For most people, DOMS is completely gone by day five at the latest. If soreness is still significant after seven days, it's worth checking in with a health professional.
Who gets it more —
and why youth athletes are different.
Anyone can get DOMS. But there are real differences between how it affects young athletes versus adults — and parents especially need to understand this, because the experience can look and feel quite different.
Youth athletes vs adults — the key differences
The most important thing for parents to understand
Young athletes — especially those aged 5–12 — often have a harder time describing what they're feeling and whether it's soreness or actual pain. They may dramatise it, or equally, they may push through something that actually needs attention.
Teaching your athlete the difference between "my muscles are sore and achy" (DOMS) and "something feels sharp, different, or wrong" (potential injury) is one of the most valuable things you can do. We'll cover this more in the warning signs section below.
Why do some athletes get worse DOMS than others?
Even within the same training session, two athletes can have completely different experiences. The main factors that influence how much DOMS you get include:
Myths vs facts.
There's a lot of misinformation floating around about DOMS. Some of it is harmless. Some of it leads athletes and parents to make decisions that actually slow recovery. Let's clear it up.
"No pain, no gain — if you're not sore, you didn't work hard enough."
DOMS is not a measure of workout quality. As your body adapts, you get less sore doing the same work — that's a good sign, not a bad one. You can make real progress without being sore. Chasing soreness is not a training strategy.
"DOMS is caused by lactic acid building up in your muscles."
This was the old theory and it's been thoroughly debunked. Lactic acid clears within an hour of exercise. DOMS is caused by micro-tears and the subsequent inflammation response.
"You should rest completely and not move when you have DOMS."
Light movement actually helps. Gentle activity increases blood flow to sore muscles, which speeds up the repair process. Complete rest is not the answer — unless the soreness is severe.
"Stretching before training prevents DOMS."
Research consistently shows that static stretching before exercise does not prevent DOMS. A proper dynamic warm-up can reduce the severity, but stretching alone won't stop it.
"If you train through DOMS you'll make it worse."
Training the same muscles at full intensity during peak DOMS is not ideal, but light and moderate activity on sore muscles is fine and often beneficial. Listen to the body — don't stop completely.
"Ice baths completely eliminate DOMS."
Cold water immersion can reduce the perception of soreness and some inflammation, but recent research suggests it may also blunt some of the adaptation signal — meaning it could slightly reduce the training benefit. Good for competition recovery, less ideal for regular training recovery.
What actually helps.
Not everything marketed as a DOMS fix actually works. Here's what the evidence actually supports — split into what helps, what might help a little, and what doesn't really do much.
Light movement and active recovery. A gentle walk, easy swim, or low-intensity activity on recovery days increases blood flow to sore muscles and speeds up the repair process. This is the most consistently supported approach.
Sleep. The majority of muscle repair happens during deep sleep. Growth hormone — which drives tissue repair — is released in significant amounts during sleep. For youth athletes especially, 8–10 hours is not a luxury. It's recovery.
Adequate protein intake. Muscles are repaired using protein. If an athlete isn't eating enough protein, the repair process is slower. This doesn't mean protein shakes — it means making sure meals include good protein sources consistently.
Hydration. Dehydrated muscles recover more slowly. Staying well hydrated before, during, and after training is one of the simplest recovery tools available.
Gradual training progression. The best way to reduce DOMS long-term is to increase training load gradually rather than in big jumps. The body adapts best when changes are incremental.
Massage. Many athletes report feeling better after massage, and some studies show modest reductions in soreness. The evidence isn't definitive but the risk is low — if it feels good, it's not harmful.
Foam rolling. Similar to massage — studies show some short-term relief and improved range of motion. Most beneficial before training as part of a warm-up.
Contrast showers (alternating hot and cold). Anecdotally popular, the evidence is modest. Worth trying if accessible — the contrast can help with perceived soreness.
Anti-inflammatories (ibuprofen etc). These reduce inflammation and therefore reduce pain. However, inflammation is part of the repair process — consistently suppressing it with medication may slow adaptation. Occasional use is fine; habitual use is not recommended for training recovery.
Don't skip the warm-up. Young athletes especially benefit from 10–15 minutes of dynamic warm-up before any intense session. It doesn't prevent DOMS but it does reduce severity.
Communicate openly. Young athletes need to feel safe saying they're sore. Normalise talking about it so you can distinguish DOMS from something that needs attention.
Prioritise sleep over everything else. For athletes under 18, sleep is the single most powerful recovery tool available. 8–10 hours is appropriate. Less than this meaningfully impairs both recovery and performance.
When to be concerned.
DOMS is normal and harmless. But there are situations where muscle pain after training needs more than a rest day. Knowing the difference matters — especially for parents of young athletes who may struggle to articulate what they're feeling.
Pain that is sharp, stabbing, or localised to one specific spot — DOMS is generally a diffuse, achy feeling across a muscle group. Sharp or pinpoint pain is different and needs assessment.
Significant swelling or bruising — general muscle soreness doesn't cause visible swelling or bruising. If present, this suggests a strain or tear rather than DOMS.
Pain that gets significantly worse over 48 hours rather than better — DOMS peaks at around 48 hours and then starts to improve. Pain that keeps escalating past this point is worth investigating.
Soreness that doesn't resolve after 7 days — DOMS resolves within a week. Persistent soreness beyond this timeline warrants a check.
Pain during training, not just after — DOMS is post-exercise. If an athlete is experiencing significant pain during a session, that's not DOMS and shouldn't be pushed through.
Dark or unusual urine after very intense exercise — this can be a sign of rhabdomyolysis, a rare but serious condition where muscle breakdown releases proteins into the bloodstream. Requires immediate medical attention.
Teaching young athletes to describe what they feel
One of the most useful things you can do is give athletes a simple framework. Soreness = achy, stiff, feels like it's in the whole muscle, worse when you first move, eases as you warm up. Pain = sharp, specific, doesn't ease up, feels different to usual soreness.
When athletes understand the difference and feel safe reporting it, problems get caught earlier and appropriate recovery happens faster.
Ongoing factors —
what changes over time.
DOMS isn't static. As an athlete develops, their relationship with soreness changes. Understanding this helps coaches and parents set realistic expectations and make smarter training decisions.
The repeated bout effect
One of the most well-established findings in exercise science is the repeated bout effect — after doing a new exercise or significantly increasing load, the muscle adapts so that doing the same thing again causes noticeably less soreness. This happens relatively quickly — often after just one or two exposures.
This is why athletes who train consistently tend to get less sore over time doing similar work. It's also why returning after a break — holidays, illness, off-season — often results in significant soreness even from training that previously caused none.
How DOMS changes as athletes get older
As athletes move from youth into adolescence and then adulthood, several things shift:
Youth (5–12 years)
Muscles adapt extremely quickly. DOMS can be more acute but resolves fast. The most important factor is gradual load increase — young bodies aren't ready for adult training volumes. Recovery needs are high.
Adolescence (13–17 years)
Hormonal changes — particularly in puberty — affect muscle development, recovery speed, and how the body responds to training loads. Girls especially may notice changes in how they recover at different points in their cycle. Load management becomes more important.
Early adulthood (18–25)
Peak physical adaptation capacity. Recovery is good, adaptation is fast, and the body generally handles training loads well. DOMS is manageable with consistent training and good recovery habits.
Adults (25+)
Recovery gradually slows. The same training load may cause more pronounced soreness and take longer to resolve. Sleep, nutrition, and stress management become increasingly important recovery factors.
The role of nutrition in long-term recovery
For growing athletes especially, nutrition isn't just about fuel — it's about recovery material. Muscles are rebuilt from protein. Bone and connective tissue need calcium, vitamin D, and adequate calories. Chronically undereating — even unintentionally — impairs recovery, increases injury risk, and makes DOMS worse and longer-lasting.
Eat enough. Athletes who are undereating for their training load recover poorly. If your athlete is frequently exhausted, unusually sore, or getting sick often — inadequate nutrition is one of the first things to look at.
Include protein at every meal. Chicken, eggs, fish, dairy, legumes — these are the building blocks of muscle repair. Young athletes need consistent protein intake across the day, not just after training.
Don't skip carbohydrates. Carbohydrates replenish glycogen — the fuel stored in muscle. Low-carb eating is not appropriate for athletes with high training loads. It impairs recovery and performance.
Hydration is ongoing. Not just during training — hydration throughout the day supports muscle repair, reduces soreness severity, and improves every aspect of recovery.
The bottom line
DOMS is a completely normal part of athletic development and usually harmless. It's not a sign of injury, it's not caused by lactic acid, and it doesn't mean you need to stop training. That said, very severe, sharp, or unusual pain after training is worth paying attention to — normal DOMS should feel like an achy, widespread soreness, not something sharp or localised.
For young athletes, it's especially important that parents and coaches normalise it, teach athletes to describe what they're feeling, and create an environment where soreness is talked about openly rather than pushed through silently.
The athletes who manage DOMS best are the ones with consistent training, good sleep, adequate nutrition, and the knowledge to tell the difference between soreness and something that needs attention.
Recovery is not the opposite of training. It is half of training.