Liew Bernard X W, Morris Susan, Netto Kevin
School of Sport, Rehabilitation and Exercise Sciences, University of Essex, Colchester, Essex CO4 3SQ, United Kingdom.
School of Physiotherapy and Exercise Sciences, Curtin University, GPO Box U1987, Perth, WA 6845, Australia.
J Biomech. 2020 Aug 26;109:109949. doi: 10.1016/j.jbiomech.2020.109949. Epub 2020 Jul 15.
Understanding the influence of load carriage on trunk-pelvis coordination and its variability has important functional implications for athletes who need to run with load. The aim of this study was to examine the influence of load carriage on trunk-pelvis coordination in running. Thirty healthy adults performed running while wearing a 20% bodyweight backpack, and without load. Vector coding was used to quantify trunk-pelvis segmental coordination and its variability during the stance phase of running. The four coordination patterns were: 1) anti-phase (segments moving in opposite directions), in-phase (segments moving in same directions), trunk-only phase (only trunk movement), and pelvic-only phase (only pelvic movement). For each plane, the percentage of stance phase spent in a specific coordination pattern was quantified. Coordination variability for each plane was averaged over the stance phase. Mixed effects models were used to analyse the effects of load, adjusted for the covariate of sex, on coordination and its variability. Running with load increased trunk-only coordination in the sagittal plane (P < 0.001), increased anti-phase coordination in the frontal plane (P < 0.001), reduced trunk-only phase coordination in axial rotation (P < 0.001), and increased coordination variability in all three planes (Flexion-Extension: P < 0.001; Lateral flexion: P = 0.03; Axial rotation: P < 0.001). Future studies would benefit from investigating how trunk-pelvis coordination and its variability alters candidate end-point variability indices (e.g. COM displacement), and its functional implications in load carriage running.
了解负重对躯干 - 骨盆协调性及其变异性的影响，对于需要负重跑步的运动员具有重要的功能意义。本研究的目的是检验负重对跑步时躯干 - 骨盆协调性的影响。30名健康成年人在佩戴相当于体重20%的背包和无负重的情况下进行跑步。矢量编码用于量化跑步支撑阶段躯干 - 骨盆节段性协调性及其变异性。四种协调模式为：1）反相位（节段向相反方向运动）、同相位（节段向相同方向运动）、仅躯干相位（仅躯干运动）和仅骨盆相位（仅骨盆运动）。对于每个平面，量化在特定协调模式下支撑阶段所花费的百分比。每个平面的协调性变异性在支撑阶段进行平均。使用混合效应模型分析负重的影响，并对性别协变量进行调整，以研究其对协调性及其变异性的影响。负重跑步增加了矢状面的仅躯干协调性（P < 0.001），增加了额状面的反相位协调性（P < 0.001）降低了轴向旋转的仅躯干相位协调性（P < 0.001），并增加了所有三个平面的协调性变异性（屈伸：P < 0.001；侧屈：P = 0.03；轴向旋转：P < 0.001）。未来的研究将受益于调查躯干 - 骨盆协调性及其变异性如何改变候选终点变异性指标（如重心位移），以及其在负重跑步中的功能意义。
