Background: The identification of risk factors for injury is a key step for musculoskeletal injury prevention in youth sports. Not identifying and correcting for injury risk factors may result in lost opportunity for athletic development. Physical maturation and sex affect these characteristics, which may indicate the need for both age and sex-based injury prevention programs. Hypothesis/Purpose: This study examined age and sex differences in knee strength, static balance, jump height, and lower extremity landing biomechanics in school- and high school-age athletes. Study Design: Cross-sectional Methods: Forty healthy school aged (10.8±0.8 yrs) and forty high school (16.8±0.8 yrs) athletes completed isokinetic knee flexion and extension strength tests, single-leg static balance and single-leg vertical stop jump tasks. Results: High school athletes were significantly stronger (~67% and 35% stronger for males and females, respectively) and jumped higher (regardless of sex) compared to school age athletes. High school males had worse balance (~28%) compared to their younger counterparts. High school females had lower strength (~23%) compared to males but had better balance (~46%). Conclusion: Maturation had different effects on the variables analyzed and sex differences were mainly observed after maturation. These differences may be minimized through appropriate age and sex specific training programs. Levels of Evidence: 3a Clinical Relevance: Neuromuscular and biomechanical differences between sex and age groups should be accounted for in injury prevention and rehabilitation. Inadequate training may be a primary factor contributing to injuries in a young athletic population. When designing training programs for long term athlete development, programs should be dependent on decrements seen at specific time points throughout maturation. What is known about the subject: Generally, both males and females get stronger and jump higher as they get older but the results comparing balance and biomechanics between genders or across age groups have been mixed. What this study adds to existing knowledge: The current study looks at multiple neuromuscular and biomechanical variables in male and female participants at different maturation statuses. The current data supports the significant changes observed in strength and jump height, as both genders age, but the data also demonstrates significant differences in balance between age groups in males and between genders in balance and knee flexion angles.

Pletcher, ER, Lovalekar, M, Coleman, LC, Beals, K, Nindl, BC, and Allison, KF. Decreased percent body fat but not body mass is associated with better performance on the Marine Corps Combat Fitness Test. J Strength Cond Res 37(4): 887–893, 2023—The military uses a variety of physical fitness tests to assess physical readiness. The Marine Corps designed the Combat Fitness Test (CFT) to emphasize functional fitness related to operational demands. The purpose of this study was to investigate the association between body mass (BM), fat free mass (FFM), and percent body fat (BF%) measured via air displacement plethysmography with CFT performance in male and female marines. Two-hundred 10 male (22.4 ± 2.6 years) and 84 female (22.6 ± 2.8 years) marines were grouped into quintiles according to BM (in kilograms), FFM (in kilograms), and BF%. Kruskal-Wallis test or 1-way analysis of variance were used to determine if significant differences in CFT total and component scores existed between the groups of subjects classified into quintiles of BM, FFM, and BF%. No significant differences in CFT scores were observed between BM quintile in either men or women. No significant differences in CFT scores were observed between FFM quintiles in men. Total CFT score (p = 0.002), movement to contact (MTC; p = 0.014), maneuver under fire (MANUF; p = 0.008), and ammunition lift (AL; p = 0.014) were all significantly different among FFM quintiles in women. Total CFT score (p = 0.007), MTC (p = 0.001), and MANUF (p = 0.022) were significantly different among BF% quintiles in men. Total CFT score (p = 0.008), MTC (p = 0.033), and AL (p = 0.016) were significantly different among BF% quintiles in women. Male and female marines in the quintile with lowest BF% had better CFT scores than those in higher quintiles. Targeted physical training and nutrition considerations to optimize BF% may help improve military task performance.

Little is known about how students in rehabilitation sciences accept and use generative artificial intelligence (GenAI) in their educational endeavors. We explored student perceptions, acceptance, and utilization of GenAI in school and their beliefs about its usefulness and ease of use. A cross-sectional online survey was conducted of adult students enrolled in rehabilitation sciences programs within a private urban academic university. The survey was based on the Technology Acceptance Model with questions specific to the use of GenAI in school. A total of 196 responses were included in the analysis (32.9% response rate), with responses received across all rehabilitation sciences programs. Half the respondents (50%) reported using GenAI “some of the time” in school, and 6.1% indicated frequent usage of “most of” or “all” the time. Users reported using GenAI to explain and review concepts (n = 49), to generate content or ideas (n = 20), and for grammatical support (n = 21). Users perceived GenAI as more useful and easier to use than non-users. Over half of rehabilitation sciences students use GenAI for school; however, only 6.1% report routine usage. Given the expected growth and potential of GenAI, faculty should explore strategies to facilitate the acceptance and appropriate use of this innovative technology.

Softball pitchers often pitch several games within a day and over consecutive days during a competitive season. High volumes of pitches thrown can decrease muscular strength, resulting in less proximal force generation and upper extremity compensation to maintain performance. Therefore, the purpose of this study was to assess upper and lower extremity muscular strength after pitching in a simulated game. Fourteen softball pitchers (17.9 ± 2.3 years, 166.4 ± 8.7 cm, 72.2 ± 12.6 kg) completed baseline isokinetic strength assessment for knee, hip, trunk and pitching elbow flexion and extension as well as trunk rotation. Seven days later, participants pitched a simulated game consisting of 105 fastballs prior to repeating all strength assessments. Changes in muscular strength were assessed using paired samples t-tests, with significance set a priori as p ≤ 0.05. Normalised (%BW) stride leg knee extension peak torque was significantly higher (p = 0.020) post-simulated game (75.1 ± 24.6%BW) as compared to baseline (64.0 ± 19.5%BW) and trunk flexion peak torque was significantly higher (p = 0.009) post-simulated game (84.8 ± 47.0%BW) as compared to baseline (63.5 ± 47.1%BW). This study showed an increase in knee extension and trunk flexion strength after an acute bout of pitching. The findings give insight into muscular changes following pitching which can assist in appropriate softball training and recovery.

Objectives: To assess and determine if concussion knowledge and attitudes differ among American community rugby members: Coaches, Sports Medicine Staff (SM; ranging from first aid trained personnel to sports-medicine trained physicians), Administrators (Admins), Players, and Referees/Referee Coaches (Refs). Methods: Participants completed an online survey of the Rosenbaum Concussion Knowledge and Attitude Survey-Student Version to calculate two indices: Concussion Knowledge Index (CKI: Range 0–25) and Concussion Attitude Index (CAI: Range 15–75), with higher scores indicating greater knowledge and safer attitudes towards concussion. Krushkal-Wallis tests compared CAI and CKI scores across all five roles, with pairwise comparisons using Dunn's procedure and a Bonferroni correction ( α = 0.005). Results: 702 participants (30.0 + 10.4 years, 75.1% Male) represented five groups: Coaches: n = 115; SM: n = 23; Admin: n = 18; Players: n = 472, and Refs: n = 74. Post hoc analyses revealed statistically significant differences in median CKI and CAI between Refs (22.0; 65.5) and SM (13.0; 51.0) and Players (12.0; 50.0) [ p < 0.003 for all comparisons]. Refs also had significantly higher CKI than coaches (18.0) [ p < 0.001]. Admins (22.0) had significantly higher CKI than players and SM ( p < 0.002). Lastly, players had significantly lower CAI than Coaches (61.0) and Admins (65.5) [ p < 0.001]. Conclusions: Concussion knowledge and attitudes vary significantly by role in American community rugby. Referees and administrators demonstrated the highest knowledge and safest attitudes, while players exhibited the lowest, raising concerns about self-reporting behaviors. Targeted education initiatives are needed to improve player awareness and safety.