Aspetar Orthopaedic and Sports Medicine Hospital, Doha, Qatar.
Department of Rehabilitation Sciences and Physiotherapy, Ghent University, Ghent, Belgium.
Scand J Med Sci Sports. 2018 Aug;28(8):1878-1887. doi: 10.1111/sms.13201. Epub 2018 May 16.
In elite sport, the use of strength testing to establish muscle function and performance is common. Traditionally, isokinetic strength tests have been used, measuring torque during concentric and eccentric muscle action. A device that measures eccentric hamstring muscle strength while performing the Nordic hamstring exercise is now also frequently used. The study aimed to investigate the variability of isokinetic muscle strength over time, for example, between seasons, and the relationship between isokinetic testing and the new Nordic hamstring exercise device. All teams (n = 18) eligible to compete in the premier football league in Qatar underwent a comprehensive strength assessment during their periodic health evaluation at Aspetar Orthopaedic and Sports Medicine Hospital in Qatar. Isokinetic strength was investigated for measurement error, and correlated to Nordic hamstring exercise strength. Of the 529 players included, 288 players had repeated tests with 1/2 seasons between test occasions. Variability (measurement error) between test occasions was substantial, as demonstrated by the measurement error (approximately 25 Nm, 15%), whether separated by 1 or 2 seasons. Considering hamstring injuries, the same pattern was observed among injured (n = 60) and uninjured (n = 228) players. A poor correlation (r = .35) was observed between peak isokinetic hamstring eccentric torque and Nordic hamstring exercise peak force. The strength imbalance between limbs calculated for both test modes was not correlated (r = .037). There is substantial intraindividual variability in all isokinetic test measures, whether separated by 1 or 2 seasons, irrespective of injury. Also, eccentric hamstring strength and limb-to-limb imbalance were poorly correlated between the isokinetic and Nordic hamstring exercise tests.
在精英运动中，使用力量测试来确定肌肉功能和表现是很常见的。传统上，等速力量测试已被用于测量向心和离心肌肉运动时的扭矩。现在也经常使用一种测量北欧腿筋运动时离心腿筋肌肉力量的设备。本研究旨在调查等速肌肉力量随时间的变化，例如，在赛季之间的变化，以及等速测试与新的北欧腿筋运动设备之间的关系。所有有资格参加卡塔尔顶级足球联赛的球队（n=18）都在卡塔尔 Aspetar 骨科和运动医学医院进行定期健康评估时接受了全面的力量评估。研究了等速力量的测量误差，并与北欧腿筋运动力量相关联。在 529 名入选的球员中，有 288 名球员在 1/2 个赛季的间隔时间内进行了重复测试。测试间隔时间的变异性（测量误差）很大，这一点可以从测量误差（约 25 Nm，15%）看出，无论间隔时间是 1 个还是 2 个赛季。考虑到腿筋受伤，受伤（n=60）和未受伤（n=228）球员的情况也是如此。在等速腿筋离心扭矩和北欧腿筋运动峰值力之间观察到较差的相关性（r=0.35）。两种测试模式的腿部力量不平衡计算结果之间没有相关性（r=0.037）。无论间隔时间是 1 个还是 2 个赛季，所有等速测试指标的个体内变异性都很大，与受伤无关。此外，在等速和北欧腿筋运动测试之间，腿筋的离心力量和肢体间的不平衡之间相关性较差。
