Sports- and Recreation-Related Concussions in US Youth

Under-representation of female athletes in research informing influential concussion consensus and position statements: an evidence review and synthesis

OBJECTIVE

We aimed to quantify the female athlete composition of the research data informing the most influential consensus and position statements in treating sports-related concussions.

DESIGN

We identified the most influential concussion consensus and position statements through citation and documented clinician use; then, we analysed the percentage of male and female athletes from each statement's cited research.

DATA SOURCES

We searched PubMed on 26 August 2021 with no date restrictions for English language studies using the terms 'concussion position statement' and 'concussion consensus statement.'

ELIGIBILITY CRITERIA FOR SELECTING STUDIES

Based on each statement having multiple statement editions, documented clinician use, and substantial citation advantages, we selected the National Athletic Trainers' Association (NATA, 2014), International Conference on Concussion in Sport (ICCS, 2017) and the American Medical Society for Sports Medicine (AMSSM, 2019). We extracted all cited studies from all three papers for assessment. For each paper analysing human data, at least two authors independently recorded female athlete participant data.

RESULTS

A total of 171 distinct studies with human participants were cited by these three consensus and position papers and included in the female athlete analyses (93 NATA; 13 ICCS; 65 AMSSM). All three statements documented a significant under-representation of female athletes in their cited literature, relying on samples that were overall 80.1% male (NATA: 79.9%, ICCS: 87.8 %, AMSSM: 79.4%). Moreover, 40.4% of these studies include no female participants at all.

CONCLUSION

Female athletes are significantly under-represented in the studies guiding clinical care for sport-related concussion for a broad array of sports and exercise medicine clinicians. We recommend intentional recruitment and funding of gender diverse participants in concussion studies, suggest authorship teams reflect diverse perspectives, and encourage consensus statements note when cited data under-represent non-male athletes.

Effect of Sleep-Related Symptoms on Recovery From a Sport-Related Concussion

Background

Sleep issues are commonly reported in athletes after a sport-related concussion (SRC). Further studies are needed to evaluate screening methods for sleep disturbances and the risk of persisting symptoms after an SRC.

Purpose

To evaluate the association between the Sport Concussion Assessment Tool 5 (SCAT5) symptoms of trouble falling asleep, fatigue (or low energy), and drowsiness and the risk of persisting symptoms (≥28 days to recovery) in adolescent athletes.

Study Design

Cohort study; Level of evidence, 3.

Methods

A total of 519 athletes aged 13 to 18 years reported any sleep-related symptoms with an SRC, scored as none (0), mild (1-2), moderate (3-4), or severe (5-6), at their initial office visit (median, 5.4 days after an SRC). Scores were correlated with the risk of persisting symptoms. A composite "sleep cluster" score (range, 0-18) was calculated by summing the SCAT5 component items for trouble falling asleep, fatigue, and drowsiness.

Results

The results indicated that, compared with athletes who reported that they did not have each symptom, (1) athletes who reported mild, moderate, or severe trouble falling asleep were 3.0, 4.6, and 6.7 times more likely to have persisting symptoms, respectively; (2) athletes reporting mild, moderate, or severe fatigue (or low energy) were 2.6, 4.8, and 7.6 times more likely to have persisting symptoms, respectively; and (3) athletes reporting mild, moderate, or severe drowsiness were 1.9, 4.6, and 6.8 times more likely to have persisting symptoms, respectively (P < .001 for all). For every 1-point increase in the sleep cluster score, there was a 1.2-fold increased risk of persisting symptoms and an additional 2.4 days of recovery required (P < .001 for both).

Conclusion

Athletes who reported mild, moderate, or severe sleep-related symptoms on the SCAT5 were at a proportionally increased risk of persisting symptoms at the initial office visit.

Visio-Vestibular Deficits in Healthy Child and Adolescent Athletes

OBJECTIVE

To determine the relationship between patient characteristics and performance on the visio-vestibular examination (VVE) in a cohort of healthy youth athletes and explore the potential association between the VVE and other standardized concussion batteries.

DESIGN

Cross-sectional.

SETTING

Suburban middle and high school.

PATIENTS

One hundred ninety subjects age 11 to 18 enrolled before their respective scholastic sport season between August 2017 and March 2020.

ASSESSMENT OF INDEPENDENT VARIABLES

Patient age, sex, concussion history, comorbidities, hours of weekly exercise, Sport Concussion Assessment Tool, 5th edition (SCAT-5), King-Devick (K-D), Postconcussion Symptom Inventory (PCSI).

MAIN OUTCOME MEASURES

Visio-vestibular examination abnormalities (smooth pursuit, horizontal and vertical saccades, horizontal and vertical gaze stability, convergence, right and left monocular accommodation, complex tandem gait).

RESULTS

Overall, 29.5% of subjects had at least one of 9 VVE elements abnormal, 7.9% at least 2, and 3.2% at least 3. None of 72 comparisons of the VVE elements, when stratified by age, sex, concussion history, history of headaches, attention deficit hyperactivity disorder, learning issues, psychiatric problems, motion sickness, or weekly hours of exercise, reached significance using the Benjamini-Hochberg procedure at a false discovery rate of 5%. There were no significant associations between VVE elements and the SCAT-5, K-D, or PCSI.

CONCLUSIONS

The VVE is robust across multiple patient characteristics. Although healthy subjects may have one abnormal element, multiple abnormal elements are a less common feature, making multiple abnormal elements more indicative of concussion, highlighting the use of this assessment in the setting of injury. The VVE tests unique domains when compared with the PCSI, SCAT-5, and K-D.

Parent-Child Communication regarding Sport-Related Concussion: An Application of the Theory of Planned Behavior

Extant research has discussed the importance of social climates surrounding sport-related concussion (SRC) reporting, especially the need to address parents/guardians' role in concussion management. This study explores parents/guardians' intentions toward SRC-related conversations with their children and their seeking of conversational resources via the Theory of Planned Behavior (TPB). Data collected from 292 parents/guardians of 1^st-12^th graders who play contact sports are examined via a structural equation model. The results indicate that parents/guardians' intention toward communicating with their child about SRC reporting was determined by their attitudes and subjective norms but that perceived behavioral control was not a significant predictor of intention. Furthermore, parents/guardians' intention toward having these conversations was predictive of whether they sought information to aid these conversations. This study answers calls to address parents/guardians' involvement in SRC management and provides preliminary information for persuading parents/guardians to have conversations with their children about SRC reporting.

Concussion Nondisclosure in Youth Sports

CONTEXT

Researchers conducting studies about sport-related concussion (SRC) reporting behaviors and reasons for nondisclosure primarily focus on older athletic populations. Youth athletes participating in contact sports are also at risk for SRC; however, little is known about their SRC disclosure patterns and reasons for nondisclosure.

OBJECTIVE

To examine the self-reported SRC history and reasons for SRC nondisclosure of youth athletes aged 8-14 years.

DESIGN

Cross-sectional study.

SETTING

Youth athletes in organized football, ice hockey, lacrosse, or soccer.

PATIENTS OR OTHER PARTICIPANTS

A total of 411 youth athletes (boys = 70.0% [n = 287/410]; median age = 11 [interquartile range = 10-13] years).

MAIN OUTCOME MEASURE(S)

A 15-minute survey including self-reported demographics, diagnosed and nondisclosed SRC history, and reasons for nondisclosure of suspected SRCs.

RESULTS

Ten percent of respondents (n = 41/411) recounted ≥1 diagnosed SRC, 12.7% (n = 52/411) did not report a suspected SRC, 13.1% (n = 53/404) indicated they continued to practice, and 12.3% (n = 50/406) reported they continued to play in a game after a suspected SRC. Significant associations between sport and nondisclosure existed (P values < .001) but not with self-reported concussion history (P = .14). In sex-comparable analyses, boys' lacrosse players had a higher frequency of nondisclosure than girls (P = .05). The most common reasons for nondisclosure were not wanting to lose playing time (66.7%, n = 32/48), miss a game (56.3%, n = 27/48), and let the team down (43.8%, n = 21/48) and uncertainty over injury severity and the presence of SRC (43.8%, n = 21/48).

CONCLUSIONS

Ten percent of youth athletes self-reported at least 1 diagnosed SRC. However, they also described continuing to practice or play in a game after a suspected SRC. Reasons for nondisclosure at this age were similar to those reported in high school and collegiate athletes. Recent researchers suggested negative consequences of continued play with SRC, especially in the acute stages. Anyone conducting future educational initiatives should emphasize these risks and focus on reasons why athletes of both sexes withhold reporting.

Adolescent and Parent Perceptions of the Impact of Concussion/mTBI on Family Functioning and Activity Levels in Recovery

OBJECTIVE

To explore adolescent and parent perceptions of the impact of a concussion/mild traumatic brain injury (mTBI) on family functioning and activity levels in the first 4 weeks of recovery.

SETTING

Outpatient research setting.

PARTICIPANTS

Twenty-seven adolescents (aged of 13-17 years) within 1 week of a concussion/mTBI and a parent/guardian were enrolled in the study.

DESIGN

Prospective ecological study with qualitative, semistructured interviews.

MAIN MEASURES

Adolescents reported symptoms electronically every 2 days for 28 days via the Post-Concussion Symptom Inventory. Semistructured interviews were completed with each adolescent-parent dyad at the end of the 28-day period. Interview questions focused on perceptions of recovery progress and study procedures.

RESULTS

Symptom trajectories were variable across participants. Three main themes emerged from thematic analysis, including: (1) disruption of routines and activities, (2) injury management considerations, and (3) positive and negative influential factors (eg, school and coach support, timing of injury, and recovery expectations). Results highlighted nuances of recovery challenges that families specifically face and help emphasize the potential benefits of shared decision-making and where more guidance would be appreciated such as more specific self-management of symptoms and physical activity reintegration strategies.

CONCLUSIONS

Study findings support a shared decision-making approach with the identified themes as potential topics to help consider social and environmental influences on recovery. The themes presented in the results could be topics emphasized during intake and follow-up visit processes to help guide plans of care and return-to-activity decisions.

Exploring Vestibular/Ocular and Cognitive Dysfunction as Prognostic Factors for Protracted Recovery in Sports-Related Concussion Patients Aged 8 to 12 Years

OBJECTIVE

To explore the prognostic ability of the vestibular/ocular motor screening (VOMS), King-Devick (K-D) Test, and C3 Logix Trails A and B to identify protracted recovery from sports-related concussion (SRC) in patients aged 8 to 12 years.

DESIGN

Retrospective cohort analysis.

SETTING

Specialty pediatric sports concussion clinic.

PARTICIPANTS

A total of 114 youth athletes aged 8 to 12 years who were diagnosed with an SRC within 7 days of injury.

INDEPENDENT VARIABLES

A positive screen on the VOMS, K-D, and C3 Logix Trails A and Trails B. Combined positive screens on multiple tests (ie, 2, 3, or all 4 positive screens of 4 possible).

MAIN OUTCOME MEASURES

Recovery time in days and protracted recovery (recovery time ≥30-days) were the primary outcomes of interest.

RESULTS

A positive VOMS screen was associated with 1.31 greater days to SRC recovery ( P = 0.02) than a negative VOMS screen. The K-D and C3 Logix tests were not significantly associated with recovery time, nor were any combinations of tests ( P > 0.05). The VOMS demonstrated moderate prognostic ability to predict normal recovery (negative predictive value = 80.78% [95% CI = 63.73-90.95]). Overall predictive accuracy of normal versus protracted recovery was strongest when a participant screened positive on all 4 tests (Accuracy = 76.32% [95% CI = 67.45-83.78]).

CONCLUSIONS

The VOMS was associated with overall recovery time and proved to be a useful test to identify those who would experience a normal recovery time. Combining the 4 tests improved the prognostic accuracy of the protocol in predicting protracted versus normal recovery. These findings suggest that combining multiple, varied assessments of cognition and vestibular/ocular functions may better explain factors contributing to protracted recovery.

Norm-Based Cutoffs as Predictors of Prolonged Recovery After Adolescent Sport-Related Concussion

OBJECTIVES

To identify predictors of prolonged recovery (ie, >28 days) using patient demographic factors and healthy, norm-based cutoffs on a multimodal test battery in adolescents after sport-related concussions (SRCs).

DESIGN

Retrospective cohort. Patients were deemed recovered after successful completion of return-to-play/school protocols and received medical clearance.

SETTING

Community concussion clinic.

PATIENTS

Male and female adolescent student athletes diagnosed with a SRC and evaluated within 1 week of injury.

INDEPENDENT VARIABLES

Patient demographics, medical history, injury description, computerized neurocognitive testing, vestibular/ocular testing, and symptoms at initial clinical visit.

MAIN OUTCOME MEASURES

Performance on clinical testing to predict recovery duration, classified as normal (<28 days) or prolonged (>28 days).

RESULTS

A total of 201 adolescent student athletes (age = 15.3 ± 1.4 years) were included (female 35%). Average recovery duration for the entire cohort was 22.3 ± 13.3 days, with 22% (n = 45) of adolescent student athletes taking >28 days to recover. The final model was 88.3% accurate in classifying normal and prolonged recovery. Predictor variables included sex, loss of consciousness, history of ocular disorder, history of concussion, performance on visual motor speed composite, visual motion sensitivity symptom provocation and near point of convergence distance, number-naming total time, and symptom count.

CONCLUSIONS

These findings suggest that using norm-based cutoffs from cognitive, oculomotor, and vestibulo-ocular testing and symptom reporting, clinicians can accurately predict a prolonged recovery (sensitivity = 81%) and normal recovery (specificity = 83%) in an adolescent, SRC cohort.

Association Between Fear of Pain and Sports-Related Concussion Recovery in a Pediatric Population

OBJECTIVE

To determine whether an association exists between fear of pain and recovery time from sports-related concussion in a pediatric population.

DESIGN

Prospective observational study.

SETTING

Primary outpatient sports medicine clinic of a large pediatric hospital.

PATIENTS

One hundred twenty-eight pediatric patients aged 8 to 18 years who presented to clinic with a primary diagnosis of concussion from September 2018 to March 2020. Inclusion criteria included presentation within 2 weeks of injury and symptomatic on initial visit. Patients who sustained a concussion because of motor vehicle collisions or assault were excluded.

INDEPENDENT VARIABLES

There was no intervention. Study participants who met inclusion criteria were administered the Fear of Pain Questionnaire (FOPQ) at their initial visit.

MAIN OUTCOME MEASURES

Time to clinical recovery was the main outcome measure and was determined by the fellowship-trained sports medicine physician based on resolution of concussion symptoms, resumption of normal physical and cognitive daily activities, no use of accommodations or medications, and normalization of physical exam.

RESULTS

There was a significant difference in FOPQ scores for those with prolonged recovery (M = 33.12, SD = 18.36) compared with those recovering in fewer than 28 days (M = 26.16, SD = 18.44; t [126] = -2.18, P = 0.036).

CONCLUSIONS

Consistent with the adult literature, we found that pediatric patients are more likely to have a prolonged recovery from concussion when they have higher fear of pain.

Pediatric Sports-Related Concussion: An Approach to Care

Sports-related concussion (SRC) is a common sports injury in children and adolescents. With the vast amount of youth sports participation, an increase in awareness of concussion and evidence that the injury can lead to consequences for school, sports and overall quality of life, it has become increasingly important to properly diagnose and manage concussion. SRC in the student athlete is a unique and complex injury, and it is important to highlight the differences in the management of child and adolescent concussion compared with adults. This review focuses on the importance of developing a multimodal systematic approach to diagnosing and managing pediatric sports-related concussion, from the sidelines through recovery.

Physician recommended school accommodations and student outcomes following a mild traumatic brain injury among youth with persistent post-concussive symptoms

BACKGROUND

Post-concussion return-to-learn (RTL) guidelines include implementation of school accommodations. Yet, little is known about physician recommendations for school accommodations and their impact, particularly among youth experiencing persistent post-concussive symptoms (PPCS).

OBJECTIVE

We examined the association between physician recommended school accommodations and student outcomes among youth experiencing PPCS.

METHODS

Data from a randomized comparative effectiveness trial was used. Physician recommended school accommodations (≤90 days post-injury) were collected via chart abstraction. Grade point average was extracted from school records. Reports of problems at school, concussion symptoms, health-related quality of life (HRQOL), anxiety symptoms, and depressive symptoms were collected by survey (at baseline, three months, and 12 months post study entry).

RESULTS

Of 200 participants (Mage = 14.7, 62% female), 86% were recommended school accommodations. Number of recommended school accommodations was positively associated with number of school problems at three months (aRR 1.18, 95% CI:1.12-1.24) and 12 months (aRR 1.11, 95% CI:1.05-1.18). No significant associations were found between recommended school accommodations and GPA, HRQOL, anxiety symptoms, or depressive symptoms.

CONCLUSIONS

Physicians recommend more school accommodations for students experiencing more school problems post-concussion. Appropriate implementation of RTL recommendations made by physicians by fostering partnerships among physicians, students, and schools may be needed to achieve student-centered RTL.

Salivary miRNA Expression in Children With Persistent Post-concussive Symptoms

Background

Up to one-third of concussed children develop persistent post-concussive symptoms (PPCS). The identification of biomarkers such as salivary miRNAs that detect concussed children at increased risk of PPCS has received growing attention in recent years. However, whether and how salivary miRNA expression levels differ over time between concussed children with and without PPCS is unknown.

Aim

To identify salivary MicroRNAs (miRNAs) whose expression levels differ over time post-concussion in children with vs. without PPCS.

Methods

We conducted a prospective cohort study with saliva collection at up to three timepoints: (1) within one week of injury; (2) one to two weeks post-injury; and (3) 4-weeks post-injury. Participants were children (ages 11 to 17 years) with a physician-diagnosed concussion from a single hospital center. We collected participants' daily post-concussion symptom ratings throughout their enrollment using the Post-concussion Symptom Scale, and defined PPCS as a total symptom score of ≥ 5 at 28 days post-concussion. We extracted salivary RNA from the saliva samples and measured expression levels of 827 salivary miRNAs. We then compared the longitudinal expression levels of salivary miRNAs in children with vs. without PPCS using linear models with repeated measures.

Results

A total of 135 saliva samples were collected from 60 children. Of the 827 miRNAs analyzed, 91 had expression levels above the calculated background threshold and were included in the differential gene expression analyses. Of these 91 miRNAs, 13 had expression levels that differed significantly across the three timepoints post-concussion between children with and without PPCS (i.e., hsa-miR-95-3p, hsa-miR-301a-5p, hsa-miR-626, hsa-miR-548y, hsa-miR-203a-5p, hsa-miR-548e-5p, hsa-miR-585-3p, hsa-miR-378h, hsa-miR-1323, hsa-miR-183-5p, hsa-miR-200a-3p, hsa-miR-888-5p, hsa-miR-199a-3p+hsa-miR-199b-3p). Among these 13 miRNAs, one (i.e., hsa-miR-203a-5p) was also identified in a prior study, with significantly different expression levels between children with and without PPCS.

Conclusion

Our results from the longitudinal assessment of miRNAs indicate that the expression levels of 13 salivary miRNAs differ over time post-injury in concussed children with vs. without PPCS. Salivary miRNAs may be a promising biomarker for PPCS in children, although replication studies are needed.

Sports- and physical activity-related concussion and mental health among adolescents: Findings from the 2017 and 2019 Youth Risk Behavior Survey

This study examined the association between self-reported sports- or physical activity-related concussion and symptoms of depression and suicidal behaviors (suicidal ideation, having a suicide plan, and suicide attempts). This study used data from the 2017 and 2019 Youth Risk Behavior Survey (YRBS), a biennial, school-based, nationally representative survey of U.S. students in grade levels 9 to 12 (N = 14,496). Multivariate logistical regression models assessed the association between self-reported sports-or physical activity-related concussions and suicidal behaviors among students, controlling for a range of demographic and psychosocial variables. Altogether, 13.6% of students reported a sports-or physical activity related concussion in the past 12 months. Among youth, sports-or physical activity related concussions were significantly associated with greater odds of symptoms of depression, suicidal ideation, making a suicide plan, and suicide attempts compared to other youth who did not experience sports- or physical activity-related concussion. Findings highlight increased risk for adverse mental health outcomes among students with sports-or physical activity related concussions. Providing resources for students to engage in physical activity and sports teams may help prevent the onset of depression and suicidal behaviors; however, resources must also be available to monitor any concussions related to these activities to provide support for student emotional well-being.

Presence of persistent parent reported emotional and behavioral-related concussion symptoms is associated with lower health-related quality of life in adolescent athletes

Persistent concussion symptoms in adolescents are associated with lower health-related quality of life (HRQOL). However, the association between persistent emotional and behavioral-related concussion symptoms (EBS) and HRQOL is unknown. This study was a prospective cohort of adolescent athletes presenting to a concussion clinic within three days post-concussion and completing a one-month follow up. The independent variable in these analyses was parent reported EBS symptom presence grouped as: 1) no EBS; 2) EBS present at pre-concussion levels; and 3) EBS worse than pre-concussion. EBS included the following concussion symptoms: feeling irritable, depressed, frustrated/impatient, restless, reduced tolerance to stress/emotion, poor concentration, and fear of permanent symptoms. Dependent variables were parent reported psychosocial, physical, and total HRQOL. Separate multivariable linear regression models controlling for age, sex, and concussion history were used to assess the association between EBS and HRQOL. Estimated adjusted mean differences (MD) and 95% confidence intervals (CI) were used to assess associations; MDs with a 95%CI excluding 0.0 were considered statistically significant. Overall, n=245 presented to the study clinic three days post-concussion and completed the one-month follow-up (Mage=14.28±2.09 years, 59.02% male, 90.64% Caucasian, 31.84% with concussion history). At one-month post-concussion, adolescents with pre-concussion EBS levels had significantly lower psychosocial, physical, and total HRQOL than those with no EBS. Additionally, those with EBS worse than pre-concussion had significantly lower psychosocial, physical, and total HRQOL than those with no EBS and EBS at pre-concussion levels. These findings highlight the importance of HRQOL assessments and that targeted interventions may be needed for those with EBS at one-month post-concussion to improve HRQOL.

Mobile Subthreshold Exercise Program (MSTEP) for concussion: study protocol for a randomized controlled trial

BACKGROUND

Subthreshold exercise, defined as aerobic exercise below the level that causes symptoms, has been utilized as a treatment for youth with persistent postconcussive symptoms (PPCS), but there is currently little evidence to guide use. In addition, prior studies of exercise for PPCS have all required multiple in-person visits. We developed a virtual approach for delivering subthreshold exercise to youth with PPCS called the Mobile Subthreshold Exercise Program (MSTEP), and we have now been funded to conduct a large national randomized controlled trial (RCT) to test its efficacy for reducing concussive symptoms and improving health-related quality of life.

METHODS

This investigation is an RCT comparing MSTEP to an active control. We will recruit 200 adolescents 11-18 years old with postconcussive symptoms persisting for at least 1 week but less than 1 year. Youth will be randomized to receive either 6 weeks of subthreshold exercise (MSTEP) or a stretching condition (control). Youth and parents will complete surveys of concussive symptoms at baseline, weekly during the intervention, and at 3 and 6 months. The primary outcomes will be trajectory of concussive symptoms and health-related quality of life over the 6 months of the study. Secondary outcomes will include depression, anxiety, and sleep quality. We will also assess potential mediators of treatment effects including moderate-vigorous physical activity and fear avoidance of concussive symptoms.

DISCUSSION

This multisite RCT of MSTEP will provide vital information regarding the efficacy of a virtually delivered subthreshold exercise program for youth with PPCS, and insight regarding potential mediators of treatment effects, including objectively measured physical activity and fear avoidance of concussive symptoms.

TRIAL REGISTRATION

ClinicalTrials.gov NCT04688255. Registered on December 29, 2020.

Resting State Functional Connectivity between Dorsal Attentional Network and Right Inferior Frontal Gyrus in Concussed and Control Adolescents

Concussion among adolescents continues to be a public health concern. Yet, the differences in brain function between adolescents with a recent concussion and adolescents with no history of concussion are not well understood. Although resting state functional magnetic resonance imaging (fMRI) can be a useful tool in examining these differences, few studies have used this technique to examine concussion in adolescents. Here, we investigate the differences in the resting state functional connectivity of 52 adolescents, 38 with a concussion in the previous 10 days (mean age = 15.6; female = 36.8%), and 14 controls with no concussion history (mean age = 15.1; female = 57.1%). Independent component analysis and dual regression revealed that control adolescents had significantly greater functional connectivity between the dorsal attention network (DAN) and right inferior frontal gyrus (RIFG) compared to concussed adolescents (p-corrected < 0.001). Specifically, there was a positive DAN-RIFG connectivity in control, but not concussed, adolescents. Our findings indicate that concussion is associated with disrupted DAN-RIFG connectivity, which may reflect a general, nonspecific response to injury.

Getting a jump on recovery from sports-related concussion

Early subthreshold aerobic exercise safely improved recovery time over a stretching regimen among adolescents in this clinical trial.

Sleep Dysfunction in Adolescents With Prolonged Postconcussion Symptoms: A Reciprocal Coupling of Traumatic Brain Injury and Sleep-Related Problems

CLINICAL SCENARIO

Concussions are often neglected injuries that affect children and adolescents. Two physiological responses to a concussion are an ionic flux and an increased indiscriminate release of glutamate, which leads to an increase of intracellular calcium and extracellular potassium. This can ultimately result in sleep dysfunction, which often occurs after concussion and has long been thought of as simply another concussion symptom.

FOCUSED CLINICAL QUESTION

Does the likelihood of prolonged postconcussion symptoms increase with reported sleep-related problems (SRPs) in young athletes (8-18 y) compared to concussed young athletes without SRPs and healthy controls?

SUMMARY OF KEY FINDINGS

Four cohort studies with level 2/3 evidence measured subjective and objective sleep dysregulations in concussed and healthy populations. Overall, there was a difference in subjective SRPs between concussed and healthy patients. This correlated with other studies where worse sleep scores during the acute phase of concussion and increased SRPs led to worse ImPACT scores in patients 3 to 12 months postconcussion and longer overall recovery. Objective sleep dysfunction measures were significantly worse in concussed patients than in healthy controls, but no significant difference existed in melatonin measures.

CLINICAL BOTTOM LINE

There is strong evidence that sleep dysfunction is both a symptom of concussion as well as a causal factor of prolonged postconcussion symptoms. These studies show that sleep dysregulation is not always evident in objective measurements, leading to the strong possibility of a functional dysregulation of the sleep-wake cycle that is evident solely from subjective reports.

STRENGTH OF RECOMMENDATION

While there are strong cohort studies researching the role of sleep in those with postconcussion symptoms, the nature of sleep studies prevents the production of strong, high-level evidence studies such as randomized control trials. Thus, there is level B evidence that the likelihood of prolonged postconcussion symptoms is increased by a higher amount of SRPs.

The acute, systemic effects of aerobic exercise in recently concussed adolescent student-athletes: preliminary findings

OBJECTIVES

Examine the acute effects (pre-, during, post-intervention) of two different intensities of aerobic exercise or rest on autonomic, oculomotor, and vestibular function and symptom burden in patients with a recent sport-related concussion (SRC) and compare their responses to sex-matched, age-stratified, non-concussed (HEALTHY) student-athletes.

METHODS

Student-athletes between the ages of 13 and 18 that presented to the sports medicine clinic within Day 3-7 post-SRC and from local schools were recruited for a randomized controlled trial (RCT). The participants were administered the Vestibular/Ocular Motor Screening (VOMS), King-Devick (K-D), and Post-Concussion Symptom Scale (PCSS) before and after the intervention. Heart rate variability (HRV) and mean arterial pressure (MAP) were collected before, during, and after the intervention. The intervention was either a single, 20-min session of treadmill walking at 40% (40HR) or 60% of age-predicted max heart rate (60HR), or seated, rest (NOEX).

RESULTS

30 participants completed the intervention with the SRC group treated 4.5 ± 1.3 days post-injury. Pre-exercise HRV and MAP were significantly different (p's < 0.001) during treatment but returned to pre-exercise values within 5 min of recovery in both the SRC and HEALTHY groups. Both the SRC and HEALTHY groups exhibited similar reductions pre- to post-intervention for symptom severity and count (p's < 0.05), three VOMS items (p's < 0.05) but not K-D time.

CONCLUSIONS

To date, this is the first adolescent RCT to report the acute, systemic effects of aerobic exercise on recently concussed adolescent athletes. The interventions appeared safe in SRC participants, were well-tolerated, and provided brief therapeutic benefit.

TRIAL REGISTRATION

Clinicaltrials.gov Identifier NCT03575455.

Understanding Baseline Concussion Testing: A Resource for School Nurses as Members of Concussion Management Teams

Sports-related concussions (SRCs) are not uncommon among teen athletes. School nurses are in an ideal position to care for athletes affected with SRCs. However, evidence suggests there is a lack of knowledge regarding concussion management, use of baseline concussion testing, and active involvement on concussion management teams among school nurses. This article briefly examines the use of baseline concussion testing as a tool for assessing and managing the student athlete suffering from an SRC. The role of the school nurse on concussion management teams will also be explored. As active members of concussion management teams, working closely with athletic trainers, coaches, school administration, and local medical providers, school nurses have the opportunity to evaluate for return to learn and play, ultimately improving outcomes of student athletes suffering from SRCs.

Effect of Collaborative Care for Persistent Postconcussive Symptoms on Academic Function: A Randomized Clinical Trial

BACKGROUND

There is limited long-term data on the course of school-related problems and academic needs for youth with persistent post-concussive symptoms (PPCS).

METHODS

This was a randomized trial comparing collaborative care to usual care for 200 youth 11-18 years of age with PPCS. In this report, the main outcomes were academic functioning, GPA, school absences, date of return to school, and school days missed.

RESULTS

Youth were mean age of 14.7 (SD = 1.7), 62.0% female. New or worsening academic problems occurred in half of participants in both groups at 12 months after injury. Students were most concerned about grades and falling behind. There were no significant differences by study group on school problems or GPA, but number of days missed was lower in the collaborative care group compared at 3 months (12.5 [SD = 14.5] vs 16.1 days [20.4] adjusted relative risk [aRR] 0.67 [95% CI: 0.61, 0.74; p < .001]), 6 months (14.5 [22.1] vs 19.3 [26.6] aRR 0.77 [95% CI: 0.71, 0.84; p < .001]), and 12 months (16.9 [25.4] vs 19.6 [27.7], aRR 0.68 [95% CI: 0.62, 0.74; p < .001]).

CONCLUSIONS

Youth with PPCS are at high risk of school problems in the year after injury.

Assessment of Saccades and Gaze Stability in the Diagnosis of Pediatric Concussion

OBJECTIVE

To evaluate the discriminatory ability of different repetition increments of saccades and gaze stability testing for diagnosing concussion in adolescents.

DESIGN

Cross-sectional.

SETTING

Suburban high school and academic pediatric tertiary care center.

PARTICIPANTS

Sixty-nine adolescent athletes within 28 days of a sports- or recreation-related concussion and 69 adolescent athletes without recent concussion.

ASSESSMENT OF INDEPENDENT VARIABLES

Symptom provocation with horizontal and vertical saccades and gaze stability testing performed up to 30 repetitions.

MAIN OUTCOME MEASURES

Sensitivity and specificity at 10-repetition increments (≤10, ≤20, ≤30) and area under the receiver operating characteristic curves (AUC) of a visio-vestibular examination (VVE) subscore, scored 0 to 4 based on the number of assessments with symptom provocation, at each repetition increment.

RESULTS

Sensitivity improved when increasing from ≤10 to ≤20 to ≤30 repetitions for horizontal (25% to 50% to 69%) and vertical (32% to 52% to 74%) saccades and horizontal (19% to 45% to 71%) and vertical (23% to 45% to 72%) gaze stability. Specificity was comparable at ≤10 and ≤20 repetitions, but decreased at ≤30 repetitions across assessments. For a VVE subscore (0-4) based on the number of symptomatic assessments, the discriminatory ability of the test was highest at ≤20 repetitions (AUC of 0.79) with an optimal subscore of one (sensitivity 59%, specificity 96%).

CONCLUSIONS

A VVE including a higher threshold level of repetitions for saccades and gaze stability has improved discriminatory ability for concussion, with an optimized AUC of 0.79 at ≤20 repetitions.

CLINICAL RELEVANCE

The findings in this study suggest that a higher threshold level of repetitions of 2 commonly used visio-vestibular assessments enables clinicians to more accurately diagnose youth concussion.

An acute bout of controlled subconcussive impacts can alter dynamic cerebral autoregulation indices: a preliminary investigation

OBJECTIVES

There is growing concern repetitive head contacts sustained by soccer players may lead to long-term health ramifications. Therefore, this preliminary investigation examined the impact an acute soccer heading bout has on dynamic cerebral autoregulation (dCA) metrics.

METHODS

In this preliminary investigation, 40 successful soccer headers were performed in 20 min by 7 male elite soccer players (24.1 ± 1.5 years). Soccer balls were launched at 77.5 ± 3.7 km/h from JUGS soccer machine, located 35 m away from participants. Linear and rotational head accelerations impacts were measured using an accelerometer (xPatch). The SCAT3 indexed concussion symptom score and severity before and after: soccer headers, sham (body contact only), and control conditions. Squat-stand maneuvers were performed at 0.05 Hz and 0.10 Hz to quantity dCA through measures of coherence, phase, and gain.

RESULTS

Cumulative linear and rotational accelerations during soccer headers were 1574 ± 97.9 g and 313,761 ± 23,966 rads/s², respectively. SCAT3 symptom severity was elevated after the soccer heading bout (pre 3.7 ± 3.6, post 9.4 ± 7.6: p = 0.030) and five of the seven participants reported an increase in concussion-like symptoms (pre: 2.6 ± 3.0, post: 6.7 ± 6.2; p = 0.078). Phase at 0.10 Hz was elevated following soccer heading (p = 0.008). No other dCA metric differed following the three conditions.

CONCLUSION

These preliminary results indicate an acute bout of soccer heading resulted in alterations to dCA metrics. Therefore, future research with larger sample sizes is warranted to fully comprehend short- and long-term physiological changes related to soccer heading.

Exploring Heterogeneity of Stepped Collaborative Care Treatment Response Trajectories after Adolescent Sports Injury Concussion

Objective: Few clinical trials of posttraumatic interventions have utilized symptom trajectory modeling to explore heterogeneity of treatment responses. The goal of this investigation was to conduct a secondary analysis of a randomized clinical trial of stepped collaborative care for adolescents with sports and recreational related concussion and persistent symptoms of >1 month.Method: Trajectory modeling was used to examine the impact of randomization to the intervention as well as demographic, clinical, and injury characteristics on adolescent post-concussive symptom trajectories. Two hundred male and female adolescents were assessed >1 month after a concussion, and then 3-, 6- and 12-months later with a standardized measure of concussive symptoms, the Health and Behavior Inventory (HBI). Multinomial logistic regression was used to compare the association between intervention, demographic, clinical and injury characteristics with trajectory group membership.Results: Four post-concussive symptom trajectories emerged: recovery, remitting, low-persistent, and high-persistent. In adjusted analyses randomization to the intervention condition was associated with significantly greater odds of HBI recovery trajectory group membership (OR 3.29 95% CI 1.06-10.28). Female gender and prior concussion history were associated with significantly greater odds of high-persistent trajectory group membership relative to all other trajectories. Greater odds of high-persistent versus recovery group trajectory membership was observed for adolescents with a pre-injury history of anxiety and/or depressive disorders.Conclusions: Stepped collaborative care was associated with an increased odds of recovery versus high-persistent post-concussive symptom trajectories, while readily identifiable baseline characteristics were associated high-persistent symptoms. Future post-concussive clinical trials and practice improvement efforts could incorporate these observations.

The Relationship Between Measures of Postural Control in Concussion Assessment

OBJECTIVE

To determine the relationship between postural sway performance during commonly utilized postural control assessments following a concussion, including the modified Balance Error Scoring System (mBESS), concussion balance test (COBALT), and sensory organization test (SOT) in healthy young adults.

APPROACH

Twenty participants completed all balance testing. The mBESS conditions included double limb stance, single limb stance, and tandem stance. The COBALT was comprised of yaw plane head shake (HS) and vestibular ocular reflex cancellation conditions performed on firm and foam surfaces. Subjects performed 6 conditions of the SOT (C1-C6), which systematically perturbed sensory inputs. Postural sway performance was measured using a single force plate and quantified as a sway score for the mBESS and COBALT, and an equilibrium score for the SOT. Spearman rank correlations were used to examine the relationship between postural sway performance for each test.

MAIN RESULTS

There was a moderate positive correlation between mBESS-tandem stance and the HS on foam COBALT condition (r = .643, P = .002). There was a moderate negative correlation between mBESS-double limb stance and SOT-C6 (r = -.512, P = .021), and between mBESS-single limb stance and SOT-C6 (r = -.523, P = .018). The COBALT and SOT demonstrated numerous moderate to good negative correlations (r = -.448 to -.708, P ≤ .05), including a good negative correlation between HS on foam and SOT-C1 (r = -.725, P = .0003).

SIGNIFICANCE

Performance on the mBESS had minimal relationship to performance on the COBALT and SOT, suggesting that the clinical standard may not challenge sensory integration at the same capacity as other tests. All COBALT conditions had fair to good associations to at least 2 SOT conditions, suggesting both assessments are representative of sensory integration. Further investigation of the current clinical approach is warranted as the COBALT may be a clinically feasible test of sensory integration.

Learning and Attention Deficit/Hyperactivity Disorders as Risk Factors for Prolonged Concussion Recovery in Children and Adolescents

OBJECTIVE

Examine pre-existing learning disorders (LD) and attention deficit/hyperactivity disorders (ADHD) as risk factors for prolonged recovery and increased symptomology following pediatric mild traumatic brain injury (mTBI).

METHODS

We conducted a retrospective cohort study of children/adolescents (5-17 years) with mTBI who presented to a Children's Minnesota Concussion Clinic between April 2018 and March 2019. Differences across strata of pre-existing conditions (present vs. absent) in time to recovery measures were estimated via Kaplan-Meier and Cox proportional hazards analyses and differences in symptom trajectories were examined via linear mixed-effects regression models. Regression models were adjusted for age, sex and other confounders.

RESULTS

In our cohort of 680 mTBI patients, those with LD (n = 70) or ADHD (n = 107) experienced significantly longer median durations of symptoms (58 and 68 days, respectively) than those without (43 days). Accordingly, LD was significantly associated with delayed symptom recovery (adjusted hazard ratio (aHR) = 1.63, 95% CI: 1.16-2.29), return to school (1.47, 1.08-2.00), and return to physical activity (1.50, 1.10-2.04). Likewise, ADHD was associated with delayed recovery (1.69, 1.28-2.23), return to school (1.52, 1.17-1.97) and physical activity (1.55, 1.19-2.01). Further, patients with LD or ADHD reported, on average, significantly more concussion symptoms and higher vision symptom scores throughout recovery versus those without. There was no evidence that concussion or vision symptom recovery trajectories varied over time between those with/without LD or ADHD (joint P-interactions > 0.05).

CONCLUSION

Pre-existing LD and ADHD are risk factors for prolonged and more symptomatic mTBI recovery in youth. These results can inform clinical concussion management and recovery expectations.

Youth sport parents’ familiarity and perceptions of concussion legislation

Objectives

In an effort to reduce the negative health consequences often associated with concussions among young athletes, all U.S. states and the District of Columbia enacted youth concussion legislation between 2009 and 2014. This study explored youth sport parents’ (1) familiarity with their state's concussion legislation, and (2) perceptions about the need for additional legislative provisions not currently found in such laws.

Methods

Cross-sectional online survey data were obtained from parents ( n = 430) of youth sport athletes from 22 U.S states.

Results

Primary findings suggest that 67% of parents were moderately to extremely familiar with the removal from play requirement; 69.9% were moderately to extremely familiar with mandatory concussion training for coaches; and 75.1% were moderately to extremely familiar with the medical clearance requirement for athletes to return to play. In regard to perceptions, approximately half (50.2%) believed it is essential to mandate parent/guardian notification when a child suffers a potential concussion; and 42.8% believed it is essential to include a penalty/sanction for violating the statute. Based on the results of a multivariable logistic regression model, a significantly greater familiarity of concussion legislation was found among parents who were White/Caucasian, had advanced degrees, had higher household incomes, or were urban residents.

Conclusions

Our findings suggest that most youth sport parents have a sound understanding of concussion legislation and believe that the laws should be revised to improve best practices in preventing and managing concussions. Parents who face socio-cultural and economic barriers can benefit most from having access to credible information about their state's concussion law.

Participating in Two Video Concussion Education Programs Sequentially Improves Concussion-Reporting Intention

Undiagnosed concussions increase the risk of additional concussion and persistent symptoms from concussion. Because there are no reliable objective markers of concussion, self-reporting of subjective and non-visible symptoms are critical to ensuring proper concussion management. For this reason, educational interventions target concussion reporting, but the majority of studies have examined the efficacy of single educational interventions or compared interventions to one another. This randomized crossover study sought to identify whether there was benefit to administering multiple concussion education programs in tandem, back to back. The study randomized 313 male high school football players to first receive CrashCourse concussion education (CC) or Centers for Disease Control and Prevention video concussion education (CDC) followed by crossover with the other education. Athlete concussion-reporting intention, attitudes, subjective norms, perceived behavioral control, and enjoyment of education were assessed at baseline and after each intervention. There were statistically significant improvements across all measures, both after single intervention and crossover (all p < 0.001). Secondary analyses examining differences between education found that athletes reported higher enjoyment of concussion education immediately after participating in CC, as compared to CDC (p < 0.001). These findings demonstrate an additive benefit to implementing CC and CDC education in tandem, without decrement in enjoyment of concussion education after experiencing dual educations; in fact, enjoyment of concussion education improved after receiving education programs back to back. These educational programs appear to complement one another, and the results support the use of multi-modal concussion education to differentially target and maximize concussion reporting.

Sex Differences in the Outcomes of Mild Traumatic Brain Injury in Children Presenting to the Emergency Department

Sex differences after concussion have been studied largely in high school and college athletes, often without reference to comparison groups without concussion. This study sought to evaluate sex differences in outcomes among all children and adolescents presenting to the Emergency Department (ED) for either mild traumatic brain injury (TBI) or orthopedic injury (OI), regardless of mechanism of injury. The study involved a concurrent cohort, prospective study design with longitudinal follow-up. Participants were eight to 16 years old with mild TBI (n = 143) or OI (n = 73). They were recruited and completed an initial assessment at EDs at two children's hospitals. They returned for a post-acute assessment within two weeks of injury and for follow-up assessments at three and six months. Outcomes included child and parent proxy ratings of somatic and cognitive symptoms, and standardized tests of cognitive functioning and balance. Sex did not moderate group differences in balance, fluid or crystallized cognitive ability, or child or parent proxy ratings of somatic or cognitive symptoms. Both parents and children reported more somatic symptoms in girls than boys, but in both groups. Compared with the OI group, the mild TBI group showed significantly lower fluid cognitive ability at the post-acute assessment and significantly higher somatic and cognitive symptoms according to both child and parent proxy ratings across the first two weeks post-injury. The results suggest that sex does not moderate the outcomes of mild TBI in a pediatric ED population. Previous research pointing to sex differences after concussion may reflect the lack of comparison groups, as well as a focus on adolescents and young adults and sport-related concussion. Future research should investigate whether sex moderates the outcomes of pediatric mild TBI in adolescents but not in pre-adolescent children.

Associations between interpersonal violence victimisation and concussions among US college students

Interpersonal violence is common on college campuses and is associated with many adverse health outcomes; however, it remains unknown whether experiencing interpersonal violence victimisation is associated with concussions. The aim of this study was to estimate the associations between interpersonal violence, including emotional abuse, physical abuse and sexual assault, and concussions among a large, diverse sample of college students. We analysed cross-sectional data from the 2018-2019 national (US) Healthy Minds Study (N = 1,478). Multiple logistic regression analyses were conducted to estimate the association between interpersonal violence victimisation (any violence victimisation, emotional abuse, physical abuse and sexual assault) and concussion history (any concussion, diagnosed concussion and undiagnosed concussion), while adjusting for potential confounders. Analyses were conducted among the overall sample and separately by male and female participants. Results showed patterns of significant associations between interpersonal violence victimisation and concussions among the overall sample and among male and female participants. Among the overall sample, any interpersonal violence victimisation (adjusted odds ratio [AOR] 1.45, 95% confidence interval [CI] 1.13-1.88), emotional abuse (AOR 1.36, 95% CI 1.06-1.76), physical abuse (AOR 1.61, 95% CI 1.07-2.44) and sexual assault (AOR 2.17, 95% CI 1.44-3.26) were associated with higher odds of any concussion history. Sexual assault victimisation had the strongest association with any concussion history among male (AOR 1.96, 95% CI 1.04-3.71) and female (AOR 2.96, 95% CI 1.62-5.43) participants. These results expand on prior interpersonal violence and concussion research by showing an association with multiple victimisation measures among a large and diverse sample of college students. Medical professionals should screen for concussions among college students who experience emotional abuse, physical abuse and sexual assault to provide appropriate guidance. Information on the symptoms of concussions should be incorporated into campus violence awareness and prevention efforts.

Predictors of Treatment Response to Multidisciplinary Care for Persistent Symptoms after Pediatric Concussion

PURPOSE

To assess which pediatric patients experiencing persistent post-concussive symptoms (PCS) benefit most from multidisciplinary treatment including specialists in Neurology, Neuropsychology, Physical Therapy, and Athletic Training, and to explore the effectiveness of this approach.

METHODS

A retrospective chart review of 56 adolescents 10-20 years old (M = 15.0 ± 2.1) receiving multidisciplinary care for PCS (>30 days) was conducted.

RESULTS

Systolic blood pressure and Body Mass Index predicted time to concussion resolution (p < .05), such that higher values were associated with slower resolution. PCS scores significantly decreased between participants' initial and final clinic visits, p < .01, and among the 25 participants for whom pre-intervention PCS scores were available, symptom severity scores significantly declined following multidisciplinary intervention compared to pre-referral values (p < .01).

CONCLUSIONS

Exploratory analyses reveal that multidisciplinary treatment is a promising approach for reducing symptoms among adolescents with PCS, and that those with greater levels of physical fitness may benefit most.

Development of a scale to measure expected concussion reporting behavior

Background

Most concussion education aims to increase athlete self-report of concussive symptoms. Although the population burden of concussion is high, frequency with which this injury occurs on a given sports team in a given season is relatively low. This means that powering concussion education evaluation studies to measure change in post-injury symptom reporting behavior requires what is often a prohibitively large sample size. Thus, evaluation studies are typically powered to measure proximal cognitions. Expected reporting behavior, a cognition that reflects planned and reactive decision-making, is a theoretically indicated construct for inclusion in evaluation studies. However, previously no scales were available to measure this construct with demonstrated reliability and validity among youth athletes. The objective of this study was to develop and assess the validity of a brief single-factor scale to measure expected youth athlete concussion reporting behavior (CR-E) in a sample of youth athletes.

Methods

A mixed methods approach was used, including cognitive interviews with youth athletes, and quantitative item reduction and validation. Participants were youth athletes (aged 9–16) from the Seattle metropolitan and rural south-Georgia regions. After refining an initial pool of items using cognitive interviews with a diverse group of youth athletes (n = 20), a survey containing these items was administered to youth soccer and football players (n = 291). Item reduction statistics and sequential confirmatory factor analyses were used to reduce the initial scale using a randomly selected half of the sample. Then, a final confirmatory factor analysis and validation tests were applied to the other half of the sample of youth athletes. Predictive validation was conducted longitudinally in a separate sample of youth athletes (n = 155).

Results

Internal consistency was high (alpha = 0.89), model fit was excellent, validation tests were in the hypothesized directions, and the scale was feasible to use. Using the finalized 4-item scale, we observed that less than one-third of youth soccer and football athletes expect to “always” tell their coach about symptoms of a suspected concussion.

Conclusions

The CR-E measure should be included in future studies evaluating concussion education programming in youth athlete populations.

Supplementary Information

The online version contains supplementary material available at 10.1186/s40621-021-00364-4.

A Cross-Cultural Examination of Parental Knowledge of Concussion in Three Countries

The aim of the present study was to examine and compare knowledge regarding concussion among parents of youth soccer players, ages 5-17, from the United States, Israel, and Sicily. Results revealed parents from the United States were more knowledgeable than Israeli and Sicilian parents and were more likely to have a previous history of concussion in their children, themselves, and their social contacts. The success of concussion education, programming, and legislation in the US may account for the greater knowledge of US parents and is reason to advocate for similar resources for youth athletes internationally.

Treatment of Post-traumatic Headaches in Children: A Systematic Review

Post-traumatic headache is a secondary headache disorder beginning within 7 days of head injury. We conducted a systematic review of the evidence for treatment of post-traumatic headache in children. Of 2169 unique articles screened, 12 were included. Most studies pertained to headaches after concussion. The authors of seven studies examined the effect of medications, 4 studied nonpharmacological therapies, and 1 studied the reduction of medication usage. Much of the evidence came from retrospective chart reviews, had low level of evidence, and had fair risk of bias. High-quality randomized controlled treatment trials are needed to guide the clinical management of this condition.

The association of padded headgear with concussion and injury risk in junior Australian football: A prospective cohort study

OBJECTIVES

To assess whether padded headgear was associated with incidence of suspected sports-related concussion, non-sports-related concussion head injury, and injuries to other body regions in junior Australian football.

DESIGN

Prospective cohort injury surveillance.

METHODS

There were 400 junior players (42.5% female) enrolled across two seasons. Suspected sports-related concussion was defined by detection of observable signs on the field and medical assessment or missed match(es) due to suspected sports-related concussion. Non-sports-related concussion head injury and injuries to other body regions were defined as those that received medical assessment or resulted in a missed match.

RESULTS

There were 20 teams monitored over 258 matches. 204 players (2484 player hours) wore mandated headgear throughout the season and 196 (2246 player hours) did not. The incidence rate of suspected sports-related concussion was 3.17 (95% confidence interval: 3.04-3.30) per 1000 player-hours and no differences were observed between males and females (risk ratio 1.11; 95% confidence interval: 0.40-3.06). Headgear use was not associated with suspected sports-related concussion (risk ratio 1.09; 95% confidence interval: 0.41-2.97), non-sports-related concussion head injury (risk ratio 0.27; 95% confidence interval: 0.06-1.31), or injuries to other body regions (risk ratio 1.41; 95% confidence interval: 0.79-2.53).

CONCLUSIONS

Headgear use was not associated with reduced risk of suspected sports-related concussion, non-sports-related concussion head injury or injuries to other body regions. There was no difference in the rate of suspected sports-related concussion in female compared to male players, however, rates of non-sports-related concussion head injury and injuries to other body regions were higher in male players.

Association of impulsivity, physical development, and mental health to perceptual-motor control after concussion in adolescents

HIGHLIGHTS

After SRC, adolescents had deficits in action boundary perception accuracy, while reporting higher depression symptoms and impulsivity, including attention and cognitive instability components.Certain domains of impulsivity were predictive of action boundary perception accuracy and each perception actualization measure in the concussed group.ADD/ADHD history, anxiety scores, and physical development ratings were also significant predictors of perceptual-motor accuracy and actualization time.

Reporting of Concussion Symptoms by a Nationwide Survey of United States Parents of Middle School Children

This cross-sectional study assessed concussion symptom knowledge of parents of middle school (MS) children (aged 10-15 years) through a free-response item that solicited concussion symptoms and compared findings to a pre-validated scale-based measure. A self-administered online questionnaire was sent to a panel of randomly selected United States residents who were recruited by a third-party company, aged ≥ 18 years, and identified as parents of MS children. Via a free-response item, parents listed what they believed were concussion symptoms. Multiple sections later, parents identified potential concussion symptoms via a scale measure, which featured 25 items (22 actual symptoms, three distractor symptoms) with three response options: yes, no, maybe. Free-response item responses were coded into specific symptoms. The 1062 eligible parents that provided complete data commonly identified the symptoms of dizziness (90.2%), blurred vision (87.4%), and balance problems (86.4%) on the scale-based measure. However, these and other symptoms were less commonly identified via the free-response item (dizziness: 44.4%; blurred vision: 16.5%; balance problems: 3.5%). Concussion symptoms commonly reported via the scale-based measure were reported less frequently within the free-response item. Future research must explore strategies to help clinicians working with parents and their children to measure and assess concussion symptom reporting and knowledge.

Concussion symptoms and temporary accommodations using a student-centered return to learn care plan

BACKGROUND

Many students return to school after concussion with symptoms but without formal support.

OBJECTIVE

To examine concussion symptoms and temporary academic accommodations during school use of a four-week student-centered return to learn (RTL) care plan.

METHODS

Five public high schools used the RTL care plan and contributed student-level data after student report of concussion. Data on concussion symptoms, temporary academic accommodations corresponding to reported symptoms, and accommodations provided during RTL care plan use were examined.

RESULTS

Of 115 students, 55%used the RTL care plan for three (34%) or four (21%) weeks. Compared to students whose symptoms resolve within the first two weeks, students who used the RTL care plan for three or four weeks reported more unique symptoms (P = 0.038), higher total severity score (P = 0.005), and higher average severity per symptom (P = 0.007) at week one. Overall, 1,127 weekly accommodations were provided. While least reported, emotional symptoms received corresponding accommodations most often (127/155 reports: 82%of occurrences).

CONCLUSIONS

Use of an RTL care plan can facilitate the RTL of students with a concussion and may aid in the identification of students who are in need of longer-term support.

Selected issues in sport-related concussion (SRC|mild traumatic brain injury) for the team physician: a consensus statement

Selected Issues in Sport-Related Concussion (SRC|Mild Traumatic Brain Injury) for the Team Physician: A Consensus Statement is title 22 in a series of annual consensus documents written for the practicing team physician. This document provides an overview of selected medical issues important to team physicians who are responsible for athletes with sports-related concussion (SRC). This statement was developed by the Team Physician Consensus Conference (TPCC), an annual project-based alliance of six major professional associations. The goal of this TPCC statement is to assist the team physician in providing optimal medical care for the athlete with SRC.

Influence of Sleep Dysfunction on Concussion Assessment Outcomes Among Adolescent Athletes After Concussion and Healthy Controls

BACKGROUND

Sleep dysfunction (SD) is associated with a high symptom burden and lower neurocognitive performance after concussion and on baseline testing without injury. However, few studies have compared concussed athletes and controls with and without SD on clinical outcomes.

OBJECTIVE

To evaluate differences in clinical outcomes among both concussed athletes and matched controls with and without SD.

DESIGN

Retrospective cross-sectional study.

PARTICIPANTS

Participants aged 12 to 20 years were recruited from a concussion clinic (n = 50 patients) and research registry/flyers (n = 50 healthy age-/sex-matched controls). Participants were categorized by self-reported SD into one of 4 groups: sport-related concussion (SRC) + SD, SRC only, SD only, and controls.

MAIN OUTCOME MEASURES

Post-Concussion Symptom Scale (PCSS), Vestibular/Oculomotor Screening (VOMS), and neurocognitive testing (Immediate Postconcussion Assessment Cognitive Test).

RESULTS

Compared with the SRC only group, the SRC + SD group performed worse on all neurocognitive domains, had a higher total symptom score, and endorsed more symptoms on most VOMS items. In addition, the SRC + SD group was at an increased likelihood of having at least 1 abnormal VOMS item compared with SRC only group. The SRC only group had neurocognitive test scores and symptom reports statistically similar to the SD only group.

CONCLUSION

Sleep dysfunction after concussion is related to worse neurocognitive performance and higher concussion symptom reporting. This study extended findings to suggest vestibular symptomology is worse among athletes with SD after injury compared to injured athletes without SD. Similar performances on concussion assessments for the SRC only and SD only groups suggest SD may appear similar to clinical presentation of concussion, even at baseline in the absence of SRC.

Comparison of head impact frequency and magnitude in youth tackle football and ice hockey

Repetitive head impacts are a growing concern for youth and adolescent contact sport athletes as they have been linked to long term negative brain health outcomes. Of all contact sports, tackle football and ice hockey have been reported to have the highest incidence of head or brain injury however, each sporting environment is unique with distinct rules and regulations regarding contact and collisions. The purpose of this research was to measure and compare the head impact frequency and estimated magnitude of brain tissue strain, amongst youth tackle football and ice hockey players during game play. Head impact frequency was documented by video analysis of youth tackle football and ice hockey game play. Impact magnitude was determined through physical laboratory reconstructions and finite element modelling to estimate brain tissue strains. Tackle football demonstrated significantly higher impact frequency (P < 0.01) and magnitude of estimated brain tissue strains (P < 0.01) compared to ice hockey. A significantly higher number of higher strain head impacts were documented in tackle football when compared to ice hockey (P < 0.01). These differences suggest that youth football players may experience increased frequency and magnitude of estimated brain tissue strains in comparison to youth hockey.

Nonsteroidal anti-inflammatory drug use and concussions in adolescent athletes: incidence, severity, and recovery

OBJECTIVE

Given concerns about the potential long-term effects of concussion in young athletes, concussion prevention has become a major focus for amateur sports leagues. Athletes have been known to frequently use anti-inflammatory medications to manage injuries, expedite return to play, and treat concussion symptoms. However, the effects of baseline nonsteroidal anti-inflammatory drug (NSAID) use on the susceptibility to head injury and concussion remain unclear. This study aims to assess the effects of preinjury NSAID use on concussion incidence, severity, and recovery in young athletes.

METHODS

Data from 25,815 ImPACT (Immediate Post-Concussion Assessment and Cognitive Testing) tests were obtained through a research agreement with ImPACT Applications Inc. Subjects ranged in age from 12 to 22 years old. Those who reported NSAID use at baseline were assigned to one (anti-inflammatory [AI]) cohort, whereas all others were assigned to the control (CT) cohort. Differences in head trauma and concussion incidence, severity, and recovery were assessed using chi-square tests, unpaired t-tests, and Kaplan-Meier plots.

RESULTS

The CT cohort comprised a higher percentage (p < 0.0001) of males (66.30%) than the AI cohort (44.16%) and had a significantly greater portion of athletes who played football (p = 0.004). However, no statistically significant differences were found between the two cohorts in terms of the incidence of head trauma (CT = 0.489, AI = 0.500, p = 0.9219), concussion incidence (CT = 0.175, AI = 0.169, p = 0.7201), injury severity, or median concussion recovery time (CT = 8, AI = 8, p = 0.6416). In a multivariable analysis controlling for baseline differences between the cohorts, no association was found between NSAID use and concussion incidence or severity.

CONCLUSIONS

In this analysis, the authors found no evidence that preinjury use of NSAIDs affects concussion risk in adolescent athletes. They also found no indication that preinjury NSAID use affects the severity of initial injury presentation or concussion recovery.

Impact of Self-Efficacy and Affective Functioning on Pediatric Concussion Symptom Severity

OBJECTIVE

The purpose of this study was to examine whether self-efficacy predicted pediatric concussion symptom severity and explore whether affective mood states (e.g., depression) influenced this relationship.

METHOD

Children (8-17 years) who were diagnosed with a concussion within 30 days of injury participated in the study (n = 105). Following a clinical assessment, participants and caregivers completed questionnaires that assessed overall concussion symptom severity and current depression symptoms. Participants also completed ratings capturing self-efficacy for managing concussion recovery.

RESULTS

Linear regression models revealed that greater levels of self-efficacy predicted lower parent- (R2 = 0.10, p = .001) and youth-rated (R2 = 0.23, p < .001) concussion symptom severity. Interestingly, depression symptoms moderated the relationship between self-efficacy and concussion symptom severity.

CONCLUSIONS

Findings provide initial support for a relationship between self-efficacy and concussion outcomes and highlight the influence of depressive symptoms. Interventions that optimize youth's self-efficacy have the potential to increase treatment adherence, reduce concussion symptom severity, and improve recovery prognosis.

Utility of a Postural Stability/Perceptual Inhibition Dual Task for Identifying Concussion in Adolescents

CONTEXT

Research in the area of dual-task paradigms to assess sport-related concussion (SRC) status is growing, but additional assessment of this paradigm in adolescents is warranted.

DESIGN

This case-control study compared 49 adolescent athletes aged 12-20 years with diagnosed SRC to 49 age- and sex-matched controls on visual-spatial discrimination and perceptual inhibition (PIT) reaction time tasks performed while balancing on floor/foam pad conditions.

METHODS

The SRC group completed measures at a single time point between 1 and 10 days postinjury. Primary outcomes were dual-task reaction time, accuracy, and sway. General linear models evaluated differences between groups (P < .05). Logistic regression identified predictors of concussion from outcomes. Area under the curve evaluated discriminative ability of identifying SRC.

RESULTS

Results supported significantly higher anterior-posterior (AP) sway values in concussed participants for visual-spatial discrimination and PIT when balancing on the floor (P = .03) and foam pad (P = .03), as well as mediolateral sway values on the floor during visual-spatial discrimination (P = .01). Logistic regression analysis (R2 = .15; P = .001) of all dual-task outcomes identified AP postural sway during the PIT foam dual task as the only significant predictor of concussed status (ß = -2.4; P = .004). Total symptoms (area under the curve = 0.87; P < .001) and AP postural sway on foam (area under the curve = 0.70; P = .001) differentiated concussed from controls.

CONCLUSION

The AP postural sway on foam during a postural stability/PIT dual task can identify concussion in adolescents between 1 and 10 days from injury.

Preliminary Evidence of a Dose-Response for Continuing to Play on Recovery Time After Concussion

OBJECTIVE

To investigate a dose-response relationship between continuing to play following concussion and outcomes.

PARTICIPANTS

A total of 130 athletes (age 11-19 years).

DESIGN

Repeated-measures design comparing symptoms, neurocognitive performance, and recovery time between 52 athletes immediately removed from play (Removed), 24 who continued to play for 15 minutes or less (Short-Play), and 32 who continued to play for more than 15 minutes (Long-Play).

MAIN MEASURES

Recovery was the number of days from injury to clearance. Immediate Post-Concussion Assessment and Cognitive Testing (ImPACT) measured neurocognitive outcomes and the Post-Concussion Symptom Scale (PCSS) measured symptom severity.

RESULTS

Long-Play (44.09 ± 27.01 days) took longer to recover than Short-Play (28.42±12.74 days) and Removed (18.98 ± 13.76 days). Short-Play was 5.43 times more likely, and Long-Play 11.76 times more likely, to experience protracted recovery relative to Removed. Both Play groups had worse neurocognitive performance and higher symptom scores than Removed at days 1 to 7, with Long-Play demonstrating worse reaction time than Short-Play. At days 8 to 30, both Play groups performed worse than Removed on visual memory and visual motor speed, while only Long-Play performed worse on verbal memory and reaction time.

CONCLUSIONS

Results provide initial evidence of a dose-response effect for continuing to play on recovery from concussion, highlighting the importance of removal from play.

Sex Differences and Reporting of SCAT-5 Concussion Symptoms in Adolescent Athletes

OBJECTIVE

To elucidate specific symptoms that may differ between adolescent female and male athletes after a sports-related concussion (SRC) and identify symptoms that may require greater clinical attention by medical and athletic staff.

DESIGN

Prospective.

SETTING

This study is part of a larger research project conducted at clinics in the North Texas Concussion Network (ConTex) Registry.

PARTICIPANTS

Subjects (N = 491) aged 12 to 18 years who sustained a diagnosed SRC within 30 days of clinic visit.

INDEPENDENT VARIABLES

Sex (female vs male). Covariates included age, race, current mood (anxiety and depression), learning disability/ADHD, and time to clinic.

MAIN OUTCOME MEASURES

Twenty-two individual postconcussion symptoms as measured by the Post-Concussion Symptom Scale from the Sport Concussion Assessment Tool-5 (SCAT-5).

RESULTS

Girls endorsed higher levels of anxiety and depression symptoms at initial clinic visit. analysis of covariance results revealed that girls had significantly greater symptom severity of headache, dizziness, sensitivity to light, sensitivity to noise, pressure in the head, feeling slowed down, fatigue, and drowsiness than boys. Ordinal logistic regression results also revealed that girls had significantly greater predicted odds of higher symptom severity on these 8 symptoms and in trouble concentrating than boys.

CONCLUSIONS

Closer examination of specific symptoms with attention to patients' current levels of anxiety and depression symptoms may better inform medical and athletic staff to anticipate and address symptoms that may present greater challenges for adolescent girls than boys.