Publications (2)7.58 Total impact
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Article: Characteristics of the leg extensors in male volleyball players with jumper's knee.
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ABSTRACT: The aim of the present study was to characterize the performance ability of the leg extensor apparatus in a group of athletes with jumper's knee and to compare the results with those of a matched control group without knee symptoms. Patient and control groups (12 players in each) were selected from a population of 141 well-trained male Norwegian volleyball players, of which 55 (39%) satisfied the diagnostic criteria for jumper's knee. The testing program consisted of a standing jump, a countermovement jump, a 15-second rebound jump test, a standing jump with a 20-kg load, and a standing jump with a load corresponding to one-half of the subject's body weight. Jump height and power were measured using a contact mat connected to an electronic timer. The test results of the patient group were significantly higher than those of the control group for the countermovement jump (15% increase), power during rebound jump (41%), work done in standing jump (12%) and countermovement jump (22%), and the difference between countermovement jump and standing jump (effect of adding eccentric component). Athletes with jumper's knee demonstrated better performance in jump tests than uninjured athletes, particularly in ballistic jumps involving eccentric force generation.The American Journal of Sports Medicine 24(3):380-5. · 3.79 Impact Factor -
Article: Incidence and mechanisms of acute ankle inversion injuries in volleyball. A retrospective cohort study.
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ABSTRACT: In a retrospective cohort study of ankle inversion injuries performed after the 1991-1992 season in the top two divisions of the Norwegian Volleyball Federation, 63 injuries were found among 318 players during 60,612 hours of training and 928 matches. The study was limited to acute ankle inversion injuries that caused an absence of 1 or more days from training or match play. The total injury rate was 0.9 +/- 0.12 per 1000 player hours: 0.7 +/- 0.11 during training and 2.6 +/- 0.56 during match play. The relative risk of injury during match play versus training was 3.9 (P < 0.001). Women had an injury rate of 1.1 +/- 0.18, whereas that of men was 0.7 +/- 0.15 (relative risk = 1.47; not significant). Most of the players (78%) had suffered at least one previous injury of the affected ankle. Most injuries were mild to moderate. The majority of the injuries (86%) occurred at the net, mainly when landing after blocking (63%) or attacking (29%). We suggest that simple measures such as rule changes, technical training, and prophylactic taping or bracing may lead to a significant reduction in the incidence and severity of such injuries.The American Journal of Sports Medicine 22(5):595-600. · 3.79 Impact Factor
