Gilliam John R, Mandal Debdyuti, Wattananon Peemongkon, Banerjee Sourav, Herter Troy M, Silfies Sheri P
Applied Neuromechanics Lab, Department of Exercise Science, University of South Carolina, Columbia, SC 29208, USA.
Integrated Material Assessment and Predictive Simulation Laboratory (i-MAPS), Department of Mechanical Engineering, University of South Carolina, Columbia, SC 29208, USA.
Brain Sci. 2024 Jun 28;14(7):657. doi: 10.3390/brainsci14070657.
This study examined the impact of personalizing muscle vibration parameters on trunk control. We assessed how altered trunk extensor muscle (TEM) proprioception affects seated trunk control in healthy controls (HCs). To explore the link between altered TEM proprioception and impaired trunk control in chronic low back pain (cLBP), we performed equivalence testing between HCs undergoing TEM vibration and cLBP without vibration. Twenty HCs performed active joint reposition error (AJRE) testing to determine personalized vibration parameters. Each participant maintained balance on an unstable chair with eyes open and closed, with and without TEM vibration. We compared trunk control between HCs and twenty age- and sex-matched cLBP participants, using mean velocity and 95% confidence ellipse area of center-of-pressure changes to quantify trunk postural control. Equivalence was examined by comparing mean difference scores to minimal detectable change values and calculating between-group effect sizes. Personalized vibration parameters led to larger lumbopelvic repositioning errors (d = 0.89) than any single vibration frequency (d = 0.31-0.36). In healthy adults with no back pain, vision had large effects on postural control (η = 0.604-0.842), but TEM vibration had no significant effects ( > 0.105) or interactions with vision ( > 0.423). Between-group effect sizes (d = 0.32-0.51) exceeded our threshold for performance equivalence (d < 0.2). Muscle vibration altered position sense during AJRE testing, and personalizing parameters amplified this effect. However, TEM vibration had minimal impact on seated trunk postural control in adults with no back pain and did not lead to performance degradation comparable to that in cLBP.
本研究探讨了个性化肌肉振动参数对躯干控制的影响。我们评估了躯干伸肌（TEM）本体感觉改变如何影响健康对照者（HCs）的坐姿躯干控制。为了探究TEM本体感觉改变与慢性下腰痛（cLBP）患者躯干控制受损之间的联系，我们对接受TEM振动的HCs和未接受振动的cLBP患者进行了等效性测试。20名HCs进行了主动关节复位误差（AJRE）测试以确定个性化振动参数。每位参与者在睁眼和闭眼、有和没有TEM振动的情况下，在不稳定的椅子上保持平衡。我们比较了HCs与20名年龄和性别匹配的cLBP参与者之间的躯干控制情况，使用平均速度和压力中心变化的95%置信椭圆面积来量化躯干姿势控制。通过将平均差异分数与最小可检测变化值进行比较并计算组间效应大小来检验等效性。个性化振动参数导致的腰骶骨盆重新定位误差（d = 0.89）比任何单一振动频率（d = 0.31 - 0.36）都要大。在没有背痛的健康成年人中，视觉对姿势控制有很大影响（η = 0.604 - 0.842），但TEM振动没有显著影响（> 0.105），也没有与视觉的交互作用（> 0.423）。组间效应大小（d = 0.32 - 0.51）超过了我们的性能等效性阈值（d < 0.2）。肌肉振动在AJRE测试期间改变了位置觉，并且个性化参数放大了这种效应。然而，TEM振动对没有背痛的成年人的坐姿躯干姿势控制影响最小，并且没有导致与cLBP患者相当的性能下降。
