School of Sport, Rehabilitation and Exercise Sciences, University of Essex, Colchester, CO4 3SQ, Essex, UK.
LUNEX International University of Health, Exercise and Sports, 50, avenue du Parc des Sports, 4671, Differdange, Luxembourg.
Sci Rep. 2020 Oct 20;10(1):17831. doi: 10.1038/s41598-020-74707-4.
Having an abundance of motor solutions during movement may be advantageous for the health of musculoskeletal tissues, given greater load distribution between tissues. The aim of the present study was to understand whether motor abundance differs between people with and without low back pain (LBP) during a low-load lifting task. Motion capture with electromyography (EMG) assessment of 15 muscles was performed on 48 participants [healthy control (con) = 16, remission LBP (rLBP) = 16, current LBP (cLBP) = 16], during lifting. Non-negative matrix factorization and uncontrolled manifold analysis were performed to decompose inter-repetition variability in the temporal activity of muscle modes into goal equivalent (GEV) and non-goal equivalent (NGEV) variabilities in the control of the pelvis and trunk linear displacements. Motor abundance occurs when the ratio of GEV to NGEV exceeds zero. There were significant group differences in the temporal activity of muscle modes, such that both cLBP and rLBP individuals demonstrated greater activity of muscle modes that reflected lumbopelvic coactivation during the lifting phase compared to controls. For motor abundance, there were no significant differences between groups. Individuals with LBP, including those in remission, had similar overall motor abundance, but use different activation profiles of muscle modes than asymptomatic people during lifting.
在运动过程中拥有丰富的运动解决方案，可能有利于肌肉骨骼组织的健康，因为组织之间的负荷分布更大。本研究的目的是了解在低负荷举重任务中，有无腰痛（LBP）的人之间的运动丰富度是否存在差异。对 48 名参与者（健康对照组（con）= 16 名，缓解期腰痛组（rLBP）= 16 名，现患腰痛组（cLBP）= 16 名）进行运动捕捉和肌电图（EMG）评估，以评估 15 块肌肉。采用非负矩阵分解和非控制流分析，将肌肉模式的重复间时变变异性分解为骨盆和躯干线性位移控制的目标等效（GEV）和非目标等效（NGEV）变异性。当 GEV 与 NGEV 的比值大于零时，就会出现运动丰富度。肌肉模式的时变活动存在显著的组间差异，即与对照组相比，cLBP 和 rLBP 个体在举重阶段表现出更多反映腰骶部协同激活的肌肉模式活动。对于运动丰富度，各组之间没有显著差异。有腰痛的个体，包括缓解期的个体，整体运动丰富度相似，但在举重过程中，他们的肌肉模式激活模式与无症状个体不同。
