Journal of Athletic Training最新文献

Context: Upper extremity injuries in baseball pitchers cause significant time loss from competing and decreased quality of life. Although shoulder range of motion (ROM) is reported as a key factor to prevent potential injury, it remains unclear how limited glenohumeral ROM affects pitching biomechanics which may contribute to upper extremity injuries.

Objective: To investigate how pitchers with decreased total arc glenohumeral ROM of the throwing arm differed in upper extremity pitching kinematics and kinetics as well as ball velocity compared with pitchers with greater levels of glenohumeral ROM.

Design: Cross-sectional study.

Setting: Laboratory.

Patients or other participants: Fifty-seven baseball pitchers (ages 18-24) were divided into either control (≥160° total arc) or lower ROM (<160° total arc) groups.

Main outcome measure(s): The mean glenohumeral ROM deficits, pitching kinematic and kinetic outcomes, and ball velocity were compared between groups.

Results: The control group demonstrated significantly less deficit in total arc ROM between arms than the lower ROM (control: -1.5° ± 10.0°; lower ROM: -12.4° ± 13.9°; P < .001). While the lower ROM group displayed less maximal shoulder external rotation (ER) while pitching, the control group had significantly less difference in ROM between maximal shoulder ER while pitching and clinically measured ER (lower ROM: 64.4° ± 12.1°; control: 55.8° ± 16.6°; P = .025). The control group had significantly faster ball velocity than the lower ROM group (control: 85.0 ± 4.3 mph; lower ROM: 82.4 ± 4.8 mph; P = .024).

Conclusion: Pitchers with decreased total arc glenohumeral ROM (<160° total arc) may undergo overstretching toward ER in the shoulder during the late cocking phase. Pitchers with higher total arc ROM can pitch the same or faster ball without increasing loading in the upper extremity. Total arc glenohumeral ROM measurement can be a clinical screening tool to monitor shoulder condition over the time, and pitchers with limited total arc ROM might be at higher risk of shoulder injury.

Context: Despite the availability of specialized assessment tools, psychological readiness is usually not considered when deciding to return to sport (RTS) after sport injury. Reinjury anxiety, self-confidence, and functional attention may be associated with sport reinjury, making it important to evaluate these factors before RTS.

Objective: To predict lower extremity reinjury in soccer players using self-confidence, functional attention, and reinjury anxiety as predictive variables.

Design: Prospective cohort study.

Setting: Laboratory.

Patients or other participants: Sixty-two male soccer players, who were older than 18 years of age, suffered from lower extremity injuries, had completed the rehabilitation program, and were ready to RTS.

Main outcome measure(s): Before returning to the sport, participants completed a preseason questionnaire on their previous injuries, self-confidence, reinjury anxiety, and level of functional attention. The primary outcome measured was the risk of reinjury during the upcoming competitive season, and logistic regression was used to calculate odds ratios (ORs) with 95% confidence intervals (CIs) to determine the association between each risk factor and reinjury.

Results: The overall reinjury rate was 5.56 injuries per 1000 hours of play. Self-confidence scores of ≤47 increased the risk of reinjury by 2.26 times (relative risk = 2.26; 95% CI, 1.31-3.91; OR = 5.00; 95% CI, 1.56-16.04), and each unit increase in self-confidence score reduced the risk of reinjury by 10% (OR = 0.90; CI, 0.82-0.99; P = .03). Regarding reinjury anxiety, a score of >22 was associated with 2.43 times the risk of reinjury (relative risk = 2.43; 95% CI, 1.44-4.13; OR = 6.46; 95% CI, 1.93-21.69), and each unit increase in reinjury anxiety score increased the risk of injury by 45% (OR = 1.45; CI, 1.13-0.87; P = .004).

Conclusions: Increased reinjury anxiety and decreased self-confidence are associated with higher odds of lower extremity reinjury in male soccer players. To reduce the risk of reinjury, athletic trainers and sport psychologists should take these psychological factors into account when evaluating the psychological readiness of soccer players with a history of lower extremity injury to RTS.

Context: Participation in high school sports has physical, physiological, and social development benefits, while also increasing the risk of acute and overuse injuries. Risk of sport-related overuse injury differs between boys and girls.

Objective: To investigate differences in overuse injuries among US high school athletes participating in the gender-comparable sports of soccer, basketball, and baseball/softball.

Design: Descriptive epidemiology study using a nationally representative sample from the High School Reporting Information Online (RIO) database.

Setting: High schools.

Patients or other participants: Athletes with overuse injuries during the 2006-2007 through 2018-2019 academic years.

Main outcome measure(s): National estimates and rates of overuse injuries were extrapolated from weighted observed numbers with the following independent variables: sport, gender, academic year, class year, event type, body site, diagnosis, recurrence, activity, and position.

Results: Among an estimated 908 295 overuse injuries nationally, 43.9% (n = 398 419) occurred in boys' soccer, basketball, and baseball, whereas 56.1% (n = 509 876) occurred in girls' soccer, basketball, and softball. When comparing gender across sports, girls were more likely to sustain an overuse injury than boys (soccer, injury rate ratio [IRR]: 1.37, 95% CI = 1.20-1.57; basketball, IRR: 1.82, 95% CI = 1.56-2.14; baseball/softball, IRR: 1.21, 95% CI = 1.04-1.41). Most overuse injuries in soccer and basketball for both genders occurred to a lower extremity (soccer: 83.9% [175 369/209 071] for boys, 90.0% [243 879/271 092] for girls; basketball: 77.0% [59 239/76 884] for boys, 80.5% [81 826/101 709] for girls), whereas most overuse injuries in baseball and softball were to an upper extremity (72.5% [81 363/112 213] for boys, 53.7% [73 557/136 990] for girls). For boys' baseball, pitching (43.5% [47 007/107 984]) was the most common activity associated with an overuse injury, which differed from the most common activity of throwing (31.7% [39 921/126 104]) for girls' softball.

Conclusions: Gender differences observed in this study can help guide future strategies that are more specific to gender and sport to reduce overuse injuries among high school athletes.

Context: Individuals with anterior cruciate ligament reconstruction (ACLR) often fail to return to their previous level of sport performance. Although multifaceted, this inability to regain preinjury performance may be influenced by impaired plyometric ability attributable to chronic quadriceps dysfunction. Whole-body vibration (WBV) acutely improves quadriceps function and biomechanics after ACLR, but its effects on jumping performance outcomes such as jump height, the reactive strength index (RSI), and knee work and power are unknown.

Objective: To evaluate the acute effects of WBV on measures of jumping performance in those with ACLR.

Design: Crossover study design.

Setting: Research laboratory.

Patients or other participants: Thirty-six individuals with primary, unilateral ACLR.

Intervention(s): Participants stood on a WBV platform in a mini-squat position while vibration or no vibration (control) was applied during six 60-second bouts with 2 minutes of rest between bouts.

Main outcome measure(s): Double-leg jumping tasks were completed preintervention and postintervention (WBV or control) and consisted of jumping off a 30-cm box to 2 force plates half the participant's height away. The jumping task required participants to maximally jump vertically upon striking the force plates.

Results: Whole-body vibration did not produce significant improvements in any of the study outcomes (ie, jump height, RSI, and knee work and power) in either limb (P = .053-.839).

Conclusions: These results suggest that a single bout of WBV is insufficient for improving jumping performance in individuals with ACLR. As such, using WBV to acutely improve jumping performance post-ACLR is likely not warranted. Future research should evaluate the effects of repeated exposure to WBV in combination with other plyometric interventions on jumping performance.