方法:在等速膝关节强度测试期间,很少考虑与测量的扭矩值相对应的膝盖弯曲角度。此外,坐姿测试中的髋部屈曲角度与大多数日常生活和体育活动中的不同。关于髋部角度影响的信息有限,肌肉收缩模式,在整个运动范围(ROM)上的等速膝盖强度和速度是可用的。20名休闲运动员(10名女性,10名男性;23.3±3.2岁;72.1±16.5kg;1.78±0.07m)在以下条件下进行了10°和90°髋关节屈曲的等速膝关节屈曲和伸展测试:(i)以60°/s同心,(ii)180°/s同心,和(iii)以60°/s偏心。髋部角度的影响,收缩模式,和速度对特定角度的扭矩和HQ比率以及常规参数(峰值扭矩,峰值扭矩角度,和HQ比率)使用统计参数映射和参数ANOVA进行分析,分别。
结果:一般来说,与屈曲的髋关节相比,伸展的髋关节中特定角度和常规扭矩和HQ比率较低。因此,与膝盖伸展相比,在膝关节屈曲过程中,扭矩值下降的程度更大,但在整个ROM中并不一致。在较低的速度和偏心模式下,扭矩值较大,但是在较短和较大的肌肉长度时,速度和收缩模式的影响较小,分别。
结论:膝关节的等速运动强度受髋关节屈曲角度的影响。因此,测试和训练期间的坐姿是有问题的,因为在日常生活和体育活动中髋关节很少在90°弯曲。仰卧位时膝关节最大力量较低,应考虑进行培训和测试。角度特定的效果不能由常规参数反映。因此,建议进行特定角度的分析以获得补充信息,从而改善膝关节强度测试。
METHODS: During isokinetic knee strength testing, the knee flexion angles that correspond to the measured torque values are rarely considered. Additionally, the hip flexion angle during seated testing diverges from that in the majority of daily life and sporting activities. Limited information concerning the influence of hip angle, muscle contraction mode, and velocity on the isokinetic knee strength over the entire range of motion (ROM) is available. Twenty recreational athletes (10 females, 10 males; 23.3 ± 3.2 years; 72.1 ± 16.5 kg; 1.78 ± 0.07 m) were tested for isokinetic knee flexion and extension at 10° and 90° hip flexion with the following conditions: (i) concentric at 60°/s, (ii) concentric at 180°/s, and (iii) eccentric at 60°/s. The effects of hip angle, contraction mode, and velocity on angle-specific torques and HQ-ratios as well as conventional parameters (peak torques, angles at peak torque, and HQ-ratios) were analyzed using statistical parametric mapping and parametric ANOVAs, respectively.
RESULTS: Generally, the angle-specific and conventional torques and HQ-ratios were lower in the extended hip compared to a flexed hip joint. Thereby, in comparison to the knee extension, the torque values decreased to a greater extent during knee flexion but not consistent over the entire ROM. The torque values were greater at the lower velocity and eccentric mode, but the influence of the velocity and contraction mode were lower at shorter and greater muscle lengths, respectively.
CONCLUSIONS: Isokinetic knee strength is influenced by the hip flexion angle. Therefore, a seated position during testing and training is questionable, because the hip joint is rarely flexed at 90° during daily life and sporting activities. Maximum knee strength is lower in supine position, which should be considered for training and testing. The angle-specific effects cannot be mirrored by the conventional parameters. Therefore, angle-specific analyses are recommended to obtain supplemental information and consequently to improve knee strength testing.