Biduski Grazieli Maria, Knihs Débora Aparecida, Nery de Oliveira Silas, Hoinaski Laís Peixoto, Rossato Mateus, Freitas Cíntia De La Rocha
Laboratory of Biomechanics, Sport Center, Federal University of Santa Catarina, Florianópolis, Brazil.
Laboratory of Human Performance, Faculty of Physical Education and Physiotherapy, Federal University of Amazonas, Manaus, Brazil.
Front Sports Act Living. 2023 Sep 8;5:1239626. doi: 10.3389/fspor.2023.1239626. eCollection 2023.
The aims of the present study are to investigate the magnitude and direction of the elbow torque asymmetries in manual wheelchair users and to verify the agreement levels of the asymmetry's direction between different velocities and contraction modes in the isokinetic test. The sample was composed of 14 manual wheelchair users (four women, 10 men). The peak torque of the elbow flexors and extensors were measured on the dominant and non-dominant limbs, using a set of concentric/eccentric contractions at speeds of 60° s and 180° s. Asymmetries were calculated by a specific equation, and the levels of agreement of the asymmetry's direction were calculated using Kappa coefficient. The main results showed a large variability in the magnitude of the asymmetries, ranging from -73.1% (ND) to 59.9% (D) between participants. The agreement levels of the elbow flexors and extensors between the different contraction modes were great ( = 0.71-0.85) for most of the velocities [except for flexors of 60° s ( = 0.29)], but the agreement levels were only slight to fair ( = 0.16-0.31) for most of the contraction modes when comparing between velocities [except for flexors eccentric ( = 0.71)]. In conclusion, the elbow torque asymmetries are highly variable between subjects in terms of magnitude. In addition, in general, the limb favored by the asymmetry is the same when comparing between velocities, but not when comparing between contraction modes.
本研究的目的是调查手动轮椅使用者肘部扭矩不对称的程度和方向，并验证等速测试中不同速度和收缩模式之间不对称方向的一致性水平。样本由14名手动轮椅使用者组成（4名女性，10名男性）。使用一组在60°/秒和180°/秒速度下的向心/离心收缩，测量优势侧和非优势侧肢体的肘部屈肌和伸肌的峰值扭矩。通过特定方程计算不对称性，并使用kappa系数计算不对称方向的一致性水平。主要结果显示，参与者之间不对称程度的变异性很大，范围从-73.1%（非优势侧）到59.9%（优势侧）。对于大多数速度，不同收缩模式之间肘部屈肌和伸肌的一致性水平很高（κ=0.71-0.85）[除了60°/秒的屈肌（κ=0.29）]，但在比较不同速度时，大多数收缩模式的一致性水平仅为轻微到中等（κ=0.16-0.31）[除了离心收缩的屈肌（κ=0.71）]。总之，肘部扭矩不对称在个体之间的程度上具有高度变异性。此外，一般来说，在比较不同速度时，不对称所青睐的肢体是相同的，但在比较不同收缩模式时则不然。
