The Short Answer Educational content only, not medical or safety advice. Prevention evidence varies enormously in quality across the interventions in this series, from cluster randomized trials to observational data alone. Nothing here is a reason to abandon protective equipment, since helmets prevent skull fracture and death even where their effect on concussion specifically is limited. Follow the applicable laws and governing body rules for your sport and jurisdiction, and consult a concussion-experienced clinician about individual risk. No evidence shows baseline testing programs reduce concussion severity or improve recovery outcomes. Baselines exist to assist interpretation of post-injury cognitive testing by providing a personal comparison, which is a narrower purpose than the way they are often promoted. Consensus guidance states baseline testing is not required for concussion management, since normative comparisons are available (Patricios et al., 2023). Several practical problems further undermine them: athletes deliberately underperform to set an easy threshold for later clearance, group administration produces invalid results, and scores fluctuate between sessions without injury. Baselines aid interpretation of cognitive testing, nothing more. Consensus guidance states they are not required. Deliberate underperformance and poor administration undermine validity. What a Baseline Is Actually For The logic is reasonable. Cognitive ability varies widely between people, so an absolute post-injury score is hard to interpret. A previously fast athlete scoring at population average may be impaired while a slower athlete at the same score is normal. A personal baseline resolves that ambiguity. This is a real benefit and a limited one, because normative databases adjusted for age, sex, and education already provide reasonable comparison for most people, which is the basis for the consensus position that baselines are not required. The Sandbagging Problem Athletes have an obvious incentive to perform poorly at baseline, since a low baseline makes post-injury clearance easier. Research examining performance validity at baseline neurocognitive testing in collegiate football athletes found a meaningful proportion of baseline results failed validity criteria, indicating suboptimal effort (Abeare et al., 2019). This is a serious problem, because an invalid baseline is worse than none at all: it provides a falsely low reference that makes genuine post-injury impairment appear as normal performance, potentially supporting premature return to play. Detecting it requires embedded validity indicators many programs do not use or examine. Administration Quality Most baseline testing happens in the least favorable conditions imaginable. Whole squads are tested simultaneously in a noisy room or computer lab, often at the end of a long preseason day, with athletes rushing through a task they regard as an administrative obstacle. Distraction, fatigue, and low motivation all depress scores. The result is a baseline reflecting the testing conditions rather than the athlete's capacity, and post-injury testing conducted individually in a quiet clinic is not comparable. Individual administration in appropriate conditions solves this and costs far more, which is why it is uncommon. Normal Fluctuation Between Sessions Even with good effort and administration, scores move between sessions. Test-retest reliability of computerized neurocognitive batteries varies considerably by measure, and a change needs to exceed normal variation before it means anything. Sleep, caffeine, illness, mood, and time of day all shift performance. Baselines also become stale, since cognitive performance changes with development in adolescents, which is why annual or biennial retesting is generally recommended. A baseline from three years ago in a 15-year-old is of questionable value. Where Effort Is Better Spent Concussion severity and recovery depend far more on what happens after the injury than on whether a baseline existed. Immediate removal from play prevents the additional injury of continuing while symptomatic. Prompt clinical assessment identifies vestibular, ocular, cervical, sleep, and mood contributors that respond to treatment (Silverberg et al., 2020). Early graded return to activity supports recovery. Education so athletes report symptoms addresses the underreporting that delays all of the above. A program with strong recognition, reporting culture, and access to clinical care outperforms one with baselines and none of those. Neck strength and cervical control are among the few individually modifiable factors in concussion risk, and they depend on mobility as much as on strength. Start your 3-day free trial for joint-specific programming supporting cervical control. Supporting Mobility Routine JME 14 Chin tucks train deep cervical flexor control, the muscles stabilizing the head during unexpected loading. Ten repetitions with 5-second holds. JME 2 Cervical retraction reinforces a neutral head position, which improves the mechanical starting point for neck muscle activation. Ten repetitions per set. JME 1 Cervical rotation maintains the segmental mobility strength work depends on, since a stiff neck trains poorly. Ten repetitions per direction. JME 15 Cervical lateral flexion addresses side-bending restriction, relevant because lateral impacts load the neck in this plane. Ten repetitions per side. JME 16 Cervical flexion and extension restore sagittal mobility, supporting the full range through which the neck absorbs load. Eight slow repetitions. JME 150 Thoracic rotation restores mid-back motion, which reduces compensatory cervical load and supports trunk control during balance recovery. Eight repetitions per direction. JME 227 Overhead reach opens the thoracic spine and rib cage, supporting the upright posture underpinning balance in older adults. Ten repetitions with controlled tempo. JME 155 Diaphragmatic breathing lowers sympathetic drive and supports the nervous system regulation behind coordinated movement. Ten slow breaths, several times daily. Start your 3-day free trial for joint-specific mobility programming supporting cervical control and balance. Common Mistakes Believing baseline testing reduces injury severity or improves outcomes Administering baselines to whole squads in noisy conditions Omitting validity indicators that detect deliberate underperformance Using stale baselines from several years earlier in adolescents Interpreting small score changes without reliability data Treating a return to baseline as sufficient for clearance Investing in baselines instead of clinical access and education Progression Prioritize the elements with evidence: recognition training, a reporting culture where athletes are not penalized for disclosing symptoms, immediate removal protocols, and access to concussion-experienced clinical care. If running baselines anyway, administer individually in quiet conditions, explain why full effort matters, use and examine validity indicators, and retest annually in developing athletes. Interpret change against reliability thresholds. Never treat return to baseline cognitive scores as sufficient for clearance on its own. Does baseline testing reduce concussion severity? No evidence supports this. Baselines assist interpretation of post-injury cognitive testing by providing a personal comparison. They do not prevent injury, alter its severity, or improve recovery, and consensus guidance states they are not required for management. What is sandbagging? Deliberately underperforming at baseline so a low reference makes later clearance easier. Research on performance validity in collegiate football athletes found a meaningful proportion of baselines failed validity criteria, and an invalid baseline is worse than none because it can mask genuine impairment. Why is group baseline testing a problem? Noise, distraction, fatigue, and low motivation depress scores, so the baseline reflects testing conditions rather than capacity. Post-injury testing done individually in a quiet clinic is then not comparable, which distorts the comparison the baseline exists to provide. How often should baselines be repeated? Annually or at least every two years in developing athletes, since cognitive performance changes with maturation. A baseline several years old in an adolescent has questionable value as a comparison. What matters more than baseline testing? Immediate removal from play, a reporting culture where athletes disclose symptoms without penalty, prompt clinical assessment identifying treatable vestibular, cervical, visual, sleep, and mood contributors, and early graded return to activity. What Actually Reduces Concussion Risk The evidence separates sharply by intervention type. Rule and policy changes have the strongest support, with disallowing bodychecking in youth ice hockey associated with substantial reductions in concussion rates, and a systematic review and meta-analysis of prevention strategies found policy change among the better-supported approaches (Eliason et al., 2023, and Houghton & Emery, 2012). Helmets in cycling, skiing, and motorcycling have strong evidence for reducing head injury overall, including severe injury and death. Equipment marketed specifically for concussion prevention in sports where helmets are not standard has much weaker support, and a cluster randomized trial of soccer headgear found no reduction in concussion incidence (McGuine et al., 2020). The Hierarchy of Prevention Evidence Rule changes limiting exposure to head impact: strongest evidence Helmets for cycling, motorcycling, skiing and snowboarding: strong for head injury overall Neck strengthening: biologically plausible, evidence limited but promising Fall prevention exercise in older adults: strong for falls, indirect for head injury Home hazard modification for high-risk older adults: good evidence for falls Education programs: reliably improve knowledge, less clearly change injury rates Equipment marketed for concussion prevention specifically: weak to absent Why Helmets Prevent Some Injuries and Not Others The distinction runs through this entire series. Helmets work by spreading impact force over a larger area and by increasing the time over which the head decelerates, which is highly effective against skull fracture, scalp laceration, and severe focal brain injury. Concussion is different. It is driven substantially by rotational acceleration of the brain within the skull, which a helmet does far less to attenuate, since the head still rotates rapidly whether or not it is padded. This is why a helmet dramatically reduces the risk of dying from a cycling crash while doing considerably less about concussion from the same crash. Rejecting helmets on that basis would be a serious error, because the injuries they prevent are the catastrophic ones. What This Means for Decisions Several practical conclusions follow. Wear the helmet, and do not expect it to prevent concussion. Treat equipment marketed as concussion-preventing with skepticism, and ask what trial supports the claim. Support rule changes limiting head impact exposure, since these have the best evidence and cost nothing to the participant. Recognize that education improves reporting and recognition, which has real value even where it does not lower injury rates, since unreported concussion carries the risk of playing on while symptomatic. And where an injury does occur, management matters more than any prevention measure did, since persistent symptoms usually reflect treatable vestibular, cervical, visual, sleep, and mood problems (Silverberg et al., 2020). References Eliason, P. H., Galarneau, J. M., Kolstad, A. T., et al. (2023). Prevention strategies and modifiable risk factors for sport-related concussions and head impacts: a systematic review and meta-analysis. British Journal of Sports Medicine, 57(12), 749-761. PubMed Patricios, J. S., Schneider, K. J., Dvorak, J., et al. (2023). Consensus statement on concussion in sport: the 6th International Conference on Concussion in Sport, Amsterdam, October 2022. British Journal of Sports Medicine, 57(11), 695-711. PubMed McGuine, T., Post, E., Pfaller, A. Y., et al. (2020). Does soccer headgear reduce the incidence of sport-related concussion? A cluster, randomised controlled trial of adolescent athletes. British Journal of Sports Medicine, 54(7), 408-413. PubMed Collins, C. L., Fletcher, E. N., Fields, S. K., et al. (2014). Neck strength: a protective factor reducing risk for concussion in high school sports. Journal of Primary Prevention, 35(5), 309-319. PubMed Houghton, K. M., & Emery, C. A. (2012). Bodychecking in youth ice hockey. Paediatrics and Child Health, 17(9), 509-510. PubMed Olivier, J., & Creighton, P. (2017). Bicycle injuries and helmet use: a systematic review and meta-analysis. International Journal of Epidemiology, 46(1), 278-292. PubMed Macpherson, A., & Spinks, A. (2008). Bicycle helmet legislation for the uptake of helmet use and prevention of head injuries. Cochrane Database of Systematic Reviews, (3), CD005401. PubMed Olivier, J., Boufous, S., & Grzebieta, R. (2019). The impact of bicycle helmet legislation on cycling fatalities in Australia. International Journal of Epidemiology, 48(4), 1197-1203. PubMed Saunders, R. N., Adams, N. S., Chapman, A. J., et al. (2018). The impact of the repeal of Michigan's universal helmet law on traumatic brain injury: a statewide analysis. American Journal of Surgery, 215(3), 424-427. PubMed Sherrington, C., Fairhall, N. J., Wallbank, G. K., et al. (2019). Exercise for preventing falls in older people living in the community. Cochrane Database of Systematic Reviews, 1(1), CD012424. PubMed Clemson, L., Stark, S., Pighills, A. C., et al. (2023). Environmental interventions for preventing falls in older people living in the community. Cochrane Database of Systematic Reviews, 3(3), CD013258. PubMed Howard, A. W., Macarthur, C., Rothman, L., et al. (2009). School playground surfacing and arm fractures in children: a cluster randomized trial comparing sand to wood chip surfaces. PLoS Medicine, 6(12), e1000195. PubMed Ono, H., Sase, T., Takasuna, H., et al. (2019). Playground equipment-related head injuries requiring hospitalization in children. Pediatrics International, 61(3), 293-297. PubMed Mrazik, M., Dennison, C. R., Brooks, B. L., et al. (2015). A qualitative review of sports concussion education: prime time for evidence-based knowledge translation. British Journal of Sports Medicine, 49(24), 1548-1553. PubMed Gibson, T. B., Herring, S. A., Kutcher, J. S., et al. (2015). Analyzing the effect of state legislation on health care utilization for children with concussion. JAMA Pediatrics, 169(2), 163-168. PubMed Abeare, C., Messa, I., Whitfield, C., et al. (2019). Performance validity in collegiate football athletes at baseline neurocognitive testing. Journal of Head Trauma Rehabilitation, 34(4), E20-E31. PubMed Jones, C. M., Austin, K., Augustus, S. N., et al. (2023). An instrumented mouthguard for real-time measurement of head kinematics under a large range of sport specific accelerations. Sensors, 23(16), 7068. PubMed Silverberg, N. D., Iaccarino, M. A., Panenka, W. J., et al. (2020). Management of concussion and mild traumatic brain injury: a synthesis of practice guidelines. Archives of Physical Medicine and Rehabilitation, 101(2), 382-393. PubMed