Shahbazi Majid, Sarrafzadeh Javad, Ebrahimi Takamjani Ismail, Negahban Hossein
Department of Physical Therapy, School of Paramedical and Rehabilitation Sciences, Mashhad University of Medical Sciences, Mashhad, Iran.
Department of Physiotherapy, School of Rehabilitation Sciences, Iran University of Medical Sciences, Tehran, Iran.
Turk J Phys Med Rehabil. 2024 Oct 31;70(4):460-467. doi: 10.5606/tftrd.2024.12768. eCollection 2024 Dec.
The study investigated the influence of starting load position during lifting on postural control in nonspecific chronic low back pain (LBP) and healthy volunteers.
The cross-sectional study included 20 healthy males (mean age: 31.8±7.4 years; range, 18 to 55 years) and 52 male patients (mean age: 33.4±9.2 years; range, 18 to 55 years) with chronic LBP between February 2016 and April 2018. Postural control characteristics were assessed by a force plate system. Center of pressure signals were obtained at a frequency of 100 Hz, and the mean of three trials was calculated. The participants were told to place their feet hip-width apart on the force plate while standing barefoot. They were then asked to lift a box weighing 10% of their body weight from the ground to waist height and then from waist height to overhead with straight elbows. They moved the box at their selected speed. The examinations began upon the examiner's command.
Results indicated a significant difference (p<0.001) in all postural control variables in chronic LBP patients who lifted a load at different heights. In addition, there was a significant difference between all of the postural control measures of this study in healthy participants during load lifting at different heights (p<0.05), with the exception of the mediolateral standard deviation of velocity (p=0.067).
Different lifting heights impact LBP patients' and healthy people's postural control differently. Postural control was more challenging during waist-to-overhead lifting in the patient group. This may be due to a stiffening strategy. The central nervous system reduces postural sway at higher centers of mass.
本研究调查了在非特异性慢性下腰痛（LBP）患者和健康志愿者中，举重时起始负荷位置对姿势控制的影响。
这项横断面研究纳入了2016年2月至2018年4月期间的20名健康男性（平均年龄：31.8±7.4岁；范围18至55岁）和52名患有慢性LBP的男性患者（平均年龄：33.4±9.2岁；范围18至55岁）。通过测力板系统评估姿势控制特征。以100Hz的频率获取压力中心信号，并计算三次试验的平均值。参与者被告知赤脚站立在测力板上，双脚分开与肩同宽。然后要求他们将一个重量为其体重10%的箱子从地面举到腰部高度，再伸直肘部从腰部高度举过头顶。他们以自己选择的速度移动箱子。检查在检查者的指令下开始。
结果表明，在不同高度举起重物的慢性LBP患者中，所有姿势控制变量均存在显著差异（p<0.001）。此外，在不同高度举起重物期间，本研究中健康参与者的所有姿势控制测量值之间也存在显著差异（p<0.05），速度的内外侧标准差除外（p=0.067）。
不同的举重高度对LBP患者和健康人的姿势控制影响不同。在患者组中，从腰部举过头顶的过程中，姿势控制更具挑战性。这可能是由于一种僵硬策略。中枢神经系统在更高的质心处减少姿势摆动。
