Arthritis Research UK Centre for Sport, Exercise and Osteoarthritis, Loughborough University, Leicestershire, UK.
School of Sport, Exercise, and Health Sciences, Loughborough University, Leicestershire, UK.
Scand J Med Sci Sports. 2018 Dec;28(12):2547-2557. doi: 10.1111/sms.13261. Epub 2018 Jul 22.
The effect of football-specific fatigue on explosive neuromuscular performance and dynamic balance has received little attention in the literature despite the potential consequences for injury risk. This study aimed to investigate the effect of fatigue induced by simulated football match play on maximal and explosive knee flexor (KF) and knee extensor (KE) torque, and thus the maximal and explosive KF/KE ratio, as well as the effect of fatigue induced by simulated football match play on whole-body response to disturbances in balance. Fifteen male team sports players (mean ± SD: age 24.2 ± 4.2 years; stature 1.79 ± 0.09 m; body mass, 77.3 ± 10.7 kg) underwent ~90 minutes of the modified Loughborough Intermittent Shuttle Test (LIST; fatiguing exercise condition) or seated rest (control condition) on separate days. Maximal and explosive isometric KF and KE voluntary torque (MVT/EVT) were assessed pre- and post-condition. Maximal and explosive KF/KE ratios were calculated. Center of mass (COM) response (displacement) to unexpected anterior and posterior platform perturbations were also assessed pre- and post-condition. Football simulated fatigue resulted in reduced KF (15%) and KE (12%) MVT (P ≤ 0.002) but was not found to reduce EVT of either muscle group, or explosive KF/KE ratio. Football simulated fatigue resulted in impaired balance response (11% increase in COM displacement) to unexpected perturbation in the posterior (P = 0.002) but not the anterior direction. Impaired response to dynamic disturbances in balance, rather than explosive torque or changes in muscle balance (H/Q ratios), may be a contributory factor toward increased injury risk in the latter portion of football games, and likely highlights the influence of fatigue on sensory/proprioceptive processes.
足球专项疲劳对爆发力神经肌肉性能和动态平衡的影响在文献中很少受到关注，尽管这可能会增加受伤风险。本研究旨在调查模拟足球比赛引起的疲劳对最大和爆发性膝关节屈肌（KF）和伸肌（KE）扭矩的影响，以及由此产生的最大和爆发性 KF/KE 比值的影响，以及模拟足球比赛引起的疲劳对平衡受扰时全身反应的影响。15 名男性团队运动运动员（平均 ± 标准差：年龄 24.2 ± 4.2 岁；身高 1.79 ± 0.09 米；体重 77.3 ± 10.7 公斤）分别在不同的日子里进行了大约 90 分钟的改良劳氏间歇性穿梭测试（LIST；疲劳运动条件）或坐姿休息（对照条件）。在条件前后评估了最大和爆发性等长膝关节屈肌和伸肌自愿扭矩（MVT/EVT）。还计算了最大和爆发性 KF/KE 比值。在条件前后，还评估了质心（COM）对意外前向和后向平台扰动的反应（位移）。足球模拟疲劳导致 KF（15%）和 KE（12%）MVT 降低（P ≤ 0.002），但并未发现降低任何肌肉群的 EVT，或爆发性 KF/KE 比值。足球模拟疲劳导致平衡反应（COM 位移增加 11%）对后向（P = 0.002）而不是前向意外扰动的受损，而不是爆发力扭矩或肌肉平衡变化（H/Q 比值），可能是足球比赛后期受伤风险增加的一个促成因素，这可能突出了疲劳对感觉/本体感觉过程的影响。
