Sport-Related Concussion: From Sideline to Safe Return

How to handle a suspected concussion on the sideline, what to do in the first 48 hours, and how the six-step graduated return brings an athlete safely back to sport.

What is sport-related concussion?

A concussion is a temporary disruption of how the brain works after a force is transmitted to the head. It is a mild form of brain injury, and it usually does not show up on scans (CT or MRI) — a normal scan does not mean there is no concussion.

Key points:

• You do not need a direct blow to the head. A hit to the body, a throw, or a whiplash-type force can accelerate or decelerate the brain enough to cause a concussion
• Combat sports such as judo and wrestling are a clear example: throws and hard landings can produce head acceleration without the head ever being struck
• Symptoms alone are enough to suspect a concussion. You do not need visible signs such as collapsing or a blank stare
• Common symptoms: headache, dizziness, nausea, feeling “foggy,” slowed thinking, sensitivity to light or noise, patchy memory of the event, mood swings, poor sleep, fatigue
• Most people recover in about 2 to 4 weeks, including the stepwise return to play

What to do on the sideline — day of injury

This is the most important part of this article, and the part with no room for compromise.

Key points:

• Any athlete with a suspected concussion is removed from play immediately, and does not return that day — not after ten minutes, not later in the game. The day is over
• Keep the threshold for “suspected” low: symptoms count, even mild ones, and even if the athlete insists they are fine
• Do not leave the athlete alone. Have someone stay with them and watch — symptoms can take hours to appear
• No alcohol, no driving or riding a bike that day, and no further risk of impact
• If any red flag appears (see below), call an ambulance or go to the emergency department right away
• Arrange a medical assessment as soon as possible, and write down what happened: how the injury occurred, the symptoms at the time, and whether there was any loss of consciousness

Why is “never the same day” so strict?

• A brain that is still symptomatic is more vulnerable. A second impact soon after clearly slows recovery, and in rare cases the consequences are very serious
• Athletes frequently under-report symptoms — they do not want to look weak in front of teammates, they see toughness as part of who they are, or they worry about their starting spot, a scholarship, or a big game
• So the decision cannot rest on the athlete saying “I’m okay.” Coaches, parents, and athletic trainers are responsible for removing the athlete and refusing same-day return

The first 48 hours — rest, but not total rest

Strict rest in a dark, quiet room — sometimes called “cocooning” — used to be standard advice. That advice has been overturned.

Key points:

• In randomised trials, five days of strict rest was not better than usual care: 1 to 2 days of rest followed by a stepwise return to activity
• For the first 24 to 48 hours, aim for relative rest: cut back on mentally demanding tasks, reduce screen time (phone, computer, gaming), and avoid anything with impact risk
• Relative rest is not bed rest. Walking around and doing light everyday activities is fine and encouraged
• Sleep directly affects recovery. Poor sleep slows healing, so make sleep hygiene a priority: keep a consistent schedule, no screens before bed, avoid long daytime naps
• Symptoms fluctuating over the first few days is normal. What matters is the overall trend

Graduated return to sport — six steps

Light aerobic exercise — exercise that raises your heart rate without impact — started within 24 to 72 hours of injury safely speeds recovery. The idea is borrowed from cardiac rehabilitation: exercise as medicine.

How hard is hard enough? The symptom-threshold rule:

• Exercise must not make symptoms clearly worse. The rule of thumb: no more than a 2-point rise on a 0-to-10 symptom scale
• If formal exercise testing is not available, start at roughly 50% of age-predicted maximum heart rate (220 minus your age)
• Example: for a 16-year-old, 220 − 16 = 204, so about 100 beats per minute
• If symptoms rise more than 2 points, stop that session and drop back to the previous level the next day

The six steps (each step at least 24 hours):

The rules:

• Spend at least 24 hours at each step, and only move up if symptoms stay tolerable
• Before step 5 (full contact), the athlete must be symptom-free at rest and symptom-free with exertion, and must be assessed and cleared by a doctor
• If symptoms come back, drop one step, stay there 24 hours, then try again
• Children and adolescents usually progress more slowly than adults and should be managed more conservatively
• For children and teens there is a useful “dose” target: about 259 minutes of moderate-to-vigorous activity in the first week and about 565 minutes over two weeks. Doing more than that does not speed recovery further

Returning to school and work

Getting back to school or work and getting back to sport are two parallel tracks — and school comes first.

Key points:

• Return to school or work early, within what you can tolerate. Weeks of sitting at home is not the goal
• Ask for academic accommodations: shorter days, extended deadlines and exam time, less screen work, permission to take breaks, and avoiding noisy or bright environments
• The same symptom-threshold rule applies: if studying or working clearly worsens symptoms, shorten the session, rest, and try again the next day
• In practice, athletes are usually back to a normal school day before they reach full-contact practice
• One caution: fatigue and sleep problems are common in people who have never had a concussion. Not every symptom is necessarily from the injury — stress, poor sleep, and pre-existing patterns all contribute. Don’t assume every bad day means the brain injury is worsening

What if symptoms persist?

Most people recover within 2 to 4 weeks, but some do not. Persisting symptoms are a reason for active treatment, not a reason to go back to resting.

Key points:

• In adolescents, dizziness, neck pain, or headache lasting more than 10 days → cervicovestibular rehabilitation (targeted treatment for the neck and the balance system)
• Symptoms beyond 30 days → active rehabilitation plus collaborative care (doctor, physiotherapist, psychology, and the school working together) may help
• Symptoms persisting past 28 days are linked to worse school performance and lower quality of life, so treat actively rather than waiting it out
• Early exercise appears to reduce this risk: adolescents prescribed aerobic exercise 2 to 10 days after injury recovered in a median of 13 days versus 17 days, and only 21% had symptoms beyond 28 days versus 32%
• Across seven studies, a meta-analysis found early exercise shortened recovery by an average of about 4.64 days
• Keep addressing sleep problems, neck pain, and stress — all of them influence how fast you recover

When to get emergency care — red flags

If any of the following appear, call an ambulance or go to the emergency department immediately. Do not wait and watch:

• Neck pain or tenderness (possible neck injury)
• Double vision
• Weakness, numbness, tingling, or burning in the arms or legs
• Severe headache, or a headache that keeps getting worse
• Seizure or convulsion
• Loss of consciousness (for any length of time)
• Deteriorating consciousness (harder to wake, increasingly confused)
• Vomiting
• Increasing restlessness, agitation, or combative behaviour

Evidence base and limitations

Why this article was written:

• It was prompted by a 2026 paper in Clinical Journal of Sport Medicine proposing a judo-specific return-to-competition protocol, adapted from the 2023 Amsterdam international consensus on concussion in sport

What we have to be honest about:

• That judo paper is not open access. Only the abstract was available to us, so its full content and details could not be checked
• It is a protocol proposal for one sport, not a clinical trial. It does not compare outcomes with and without the protocol
• The guidance in this article therefore does not rest on that paper. It comes from the 2023 Amsterdam consensus statement and the randomised trials and meta-analyses cited above
• Combat sports genuinely are different: in judo and wrestling, throws and landings can produce sharp head acceleration with no direct blow. Sport-specific protocols make sense in principle, but direct trial evidence for sport-specific protocols is still lacking
• The “six steps, at least 24 hours each” structure is a consensus recommendation in wide clinical use, but the exact way the steps are divided has not been tested head-to-head in randomised trials
• Recovery time varies between people: age, sex, previous concussions, a history of headache or migraine, and psychological stress all matter
• This is general health information and cannot replace an individual medical assessment. Return to play is a clinical decision that must be made by a doctor

Frequently asked questions

Q: It was only a small knock and I felt fine straight away. Do I really have to leave the field?

Yes. Concussion symptoms are often delayed — feeling fine at the time and developing a headache or dizziness an hour or two later is common. And a second impact while still symptomatic clearly slows recovery. The rule is one sentence: if a concussion is suspected, out for the day.

Q: I’m a coach or parent, and the athlete keeps insisting they can keep playing. What do I do?

• Do not let them back on. This is not the athlete’s decision to make. Under-reporting is very common — they may not want to let teammates down, may see toughness as part of their identity, or may worry about a scholarship or their place in the team
• No same-day return, no exceptions, regardless of how important the game is
• Arrange for someone to stay with them and watch for red flags
• Get a medical assessment promptly. Before full-contact practice and competition, medical clearance is required — in many places this is a legal requirement, not just advice

Q: If exercise helps, can I just go back to normal training?

No — this is the most common misunderstanding. “Early exercise helps” means low-intensity, controlled aerobic exercise such as walking or a stationary bike, kept below the symptom threshold, with all impact risk removed. Returning to contact training follows the six-step progression and needs a doctor’s clearance.

Q: Do I have to avoid screens completely and stay off school?

No, not completely. For the first 24 to 48 hours, cut back on screens and mentally demanding work — but this is not a dark room and total shutdown. Trials showed five days of strict rest was no better. After that, build back up to school within what you can tolerate, using accommodations if needed. Protect your sleep at the same time: poor sleep directly slows recovery.