Department of Sports Medicine, Faculty of Health Sciences, Medical University of Lublin, Lublin, Poland.
Department of Computer Science, Faculty of Electrical Engineering and Computer Science, Lublin University of Technology, Lublin, Poland.
Ergonomics. 2023 Jan;66(1):101-112. doi: 10.1080/00140139.2022.2061051. Epub 2022 Apr 15.
Prolonged sitting may involve several mechanisms that make it a risk factor for low back pain. The aim of this study was to investigate lumbar-pelvic kinematics and multifidus muscle (MF) activity during squatting and forward bending in relation to the sedentary behaviour of physically active students. Sixty-three students were divided into two groups according to the time spent in a sitting position during the day: 'high' (>7 h/day); 'low' (≤7 h/day). Lumbar-pelvic ratios, ranges of motion, angular velocities, and MF flexion-relaxation phenomenon were investigated. Data were obtained using the optical motion analysis system, and surface electromyography. The results indicated that lumbar-pelvic ratios during both tasks and velocity of lumbar spine during squatting were significantly greater in the 'high' than in the 'low' sitting group. Muscle activity showed no differences between groups. Prolonged sitting can be considered a factor that slightly, but statistically significantly influences the lumbar-pelvic kinematics in physically active people. Lumbar-pelvic kinematics can be altered by prolonged sitting in physically active students. Lumbar-pelvic ratios during squatting and forward bending and lumbar spine velocity during squatting were significantly greater in the 'high' than in the 'low' sitting group. Sedentary behaviour should be considered during an assessment of movement patterns.: BMI: body mass index; ERR: extension-relaxation ratio; FRP: flexion-relaxation phenomenon; FRR: flexion-relaxation ratio; IPAQ: International Physical Activity Questionnaire; LBP: low back pain; METs: metabolic equivalent of tasks; MF: multifidus muscle; PA: physical activity; ROM: range of motion; sEMG: surface electromyography.
长时间久坐可能涉及多种机制，使其成为腰痛的一个风险因素。本研究旨在探讨在与身体活跃学生的坐姿行为有关的情况下，深蹲和前屈时腰椎骨盆运动学和多裂肌（MF）活动。63 名学生根据白天坐在座位上的时间分为两组：“高”（>7 小时/天）；“低”（≤7 小时/天）。研究了腰椎骨盆比、运动范围、角速度和 MF 屈伸现象。数据是使用光学运动分析系统和表面肌电图获得的。结果表明，在两种任务中，“高”组的腰椎骨盆比和深蹲时腰椎的速度都明显大于“低”组。肌肉活动在两组之间没有差异。长时间坐着可以被认为是一个略微但统计学上显著影响身体活跃人群腰椎骨盆运动学的因素。久坐可以改变身体活跃学生的腰椎骨盆运动学。在深蹲和前屈时的腰椎骨盆比和深蹲时的腰椎速度在“高”组中明显大于“低”组。在评估运动模式时，应考虑久坐行为。：BMI：体重指数；ERR：伸展-放松比；FRP：屈伸现象；FRR：屈伸比；国际体力活动问卷（IPAQ）；下腰痛（LBP）；METs：任务代谢当量；MF：多裂肌；PA：体力活动；ROM：运动范围；sEMG：表面肌电图。
