Gleeson N P, Reilly T, Mercer T H, Rakowski S, Rees D
Division of Sport, Health & Exercise, School of Sciences, Staffordshire University, Stoke-on-Trent, UK.
Med Sci Sports Exerc. 1998 Apr;30(4):596-608. doi: 10.1097/00005768-199804000-00019.
The purpose of this study was to investigate the effect of endurance activities designed to simulate the physiological demands of soccer match-play and training, on leg strength, electromechanical delay, and knee laxity.
Eight recreational soccer players completed four exercise trials in random order: 1) a prolonged intermittent high intensity shuttle run (PHISR) which required subjects to complete a total distance of 9600 m in a form simulating the pattern of physical activity in soccer match-play (activity mode; rest-to-work intervals; approximately 90 min duration), 2) a shuttle-run (SR), (3) a treadmill run (TR) which required subjects to complete an equivalent distance at a running speed corresponding to 70% VO2max, and 4) a control condition consisting of no exercise.
Results from repeated measures ANOVA revealed significant condition (PHISR; SR; TR; control) by time (pre; mid; post) interactions for peak torque (PT: knee extension and flexion: 1.05 rad.s-1), EMD and anterior tibio-femoral displacement (TFD) (P < 0.05). Impairment to indices of knee joint performance was observed in PHISR, SR, and TR trials. The greatest decrement occurred in PHISR and SR trials (up to 44%). Knee extensor and flexor strength performance near to full knee extension (0.44 rad knee flexion) was not changed following the functionally-relevant endurance activities.
Even though strength performance near to full knee extension was preserved following acute endurance activities, the risk of ligamentous injury may be increased by concomitant impairment to EMD and anterior TFD.
本研究旨在调查旨在模拟足球比赛和训练生理需求的耐力活动对腿部力量、肌电延迟和膝关节松弛度的影响。
八名业余足球运动员以随机顺序完成四项运动试验：1）长时间间歇性高强度穿梭跑（PHISR），要求受试者以模拟足球比赛身体活动模式（活动模式；休息与工作间隔；约90分钟时长）的形式完成总距离9600米，2）穿梭跑（SR），3）跑步机跑步（TR），要求受试者以相当于70%最大摄氧量的跑步速度完成相同距离，4）不运动的对照条件。
重复测量方差分析结果显示，在峰值扭矩（PT：膝关节伸展和屈曲：1.05弧度·秒-1）、肌电延迟（EMD）和胫股前移位（TFD）方面，条件（PHISR；SR；TR；对照）与时间（前；中；后）存在显著交互作用（P<0.05）。在PHISR、SR和TR试验中观察到膝关节性能指标受损。最大降幅出现在PHISR和SR试验中（高达44%）。在功能相关的耐力活动后，接近膝关节完全伸展（膝关节屈曲0.44弧度）时的膝关节伸肌和屈肌力量表现未发生变化。
尽管急性耐力活动后接近膝关节完全伸展时的力量表现得以保留，但肌电延迟和胫股前移位的同时受损可能会增加韧带损伤的风险。
