The evidence-based hamstring strengthening programme for prevention of hamstring injuries is not adopted by football teams because of its high training volume. This study on female football players investigated if high-volume training with the Nordic hamstring exercise is more effective on hamstring strength, jump height, and sprint performance than low-volume training. We also examined the time course of changes in muscle strength during the intervention period. Forty-five female football players were randomised to a high- (21 sessions, 538 total reps) or low-volume group (10 sessions, 144 total reps) and performed an 8-week training intervention with the Nordic hamstring exercise during the preseason. We tested hamstring strength (maximal eccentric force with NordBord and maximal eccentric torque with isokinetic dynamometer), jump height, and 40 m sprint before and after the intervention. The NordBord test was also performed during training weeks 4 and 6. Both groups increased maximal eccentric force (high-volume: 29 N (10%), 95% CI: 19–38 N, p < 0.001 , low-volume: 37 N (13%), 95% CI: 18–55 N, p = 0.001 ), but there were no between-group differences ( p = 0.38 ). Maximal eccentric torque, jump height, and sprint performance did not change. Maximal eccentric force increased from the pretest to week 6 (20 N (7%), 95% CI: 8 to 31 N, p < 0.001 ), but not week 4 (8 N (3%), 95% CI: −2 to 18 N, p = 0.22 ). High training volume with the Nordic hamstrings exercise did not lead to greater adaptations in strength, jump height, or speed than a low-volume programme. Players in both groups had to train for at least 6 weeks to improve maximal eccentric force significantly.
the injury and illness patterns in women's premier league football. Materials and Methods During the 2020 and 2021 seasons players in the women's premier football league in Norway reported all health problems (acute injuries, overuse injuries and illnesses) weekly, using the Oslo Sports Trauma Research Centre Questionnaire on Health Problems. We calculated incidence, average weekly prevalence, and burden (the crossproduct of incidence and severity) of all health problems reported. ResultsWe included 294 female football players (22±4 years, range: 16-37) in the study. The average response rate to the weekly questionnaire was 79% (SD: ±9%). On average, 32% (95% CI, 31% to 33%) of the players reported at least one health problem at any time and 22% (95% CI, 21% to 23%) reported a health problem negatively affecting their training volume or performance. Acute injuries caused the greatest burden of all health problems (68% of the total burden), followed by overuse injuries (25%) and illness (8%). Thigh was the most common injury location (n=143, 26% of all cases), but knee injuries caused the greatest time-loss (42% of total time-loss). Conclusion One in five players in the women's premier league in Norway had a health problem negatively affecting their training volume or performance at any time. Acute injuries represented the most burdensome health problem. Thigh injuries were most frequent while knee injuries caused the greatest time-loss.
symptom state (PASS) threshold were compared with oneway analysis of covariance (adjusted for sex, age, time to surgery, and cartilage/meniscus injury at ACLR) or chi-square tests (a=0.05). Results Eighty-three (83%) and 1477 (53%) patients attended the 10-year follow-up. Patients who received progressive preoperative and postoperative rehabilitation had superior outcomes for KOOS pain, symptoms, activities of daily living, sports and recreation compared with usual care (p<.001), with the largest difference in sports and recreation (13±6 points). A greater proportion also exceeded the PASS-threshold compared to patients who received usual care (53-97% versus 38-83%, p£.003). Conclusion Ten years after ACLR, patients who received progressive preoperative and postoperative rehabilitation had better knee function and symptoms, and a greater proportion achieved acceptable symptoms compared to patients who underwent usual care.
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