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首页> 外文期刊>Journal of Clinical and Diagnostic Research >Association of Manual Weight Lifting Tasks with Low Back Pain: A Pilot Study
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Association of Manual Weight Lifting Tasks with Low Back Pain: A Pilot Study

机译：手动举重任务与下腰痛的关联：一项初步研究

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Manual Weight Lifting (MWL) and Low Back Pain (LBP) become closely interrelated when lifting tasks are performed without adhering to lifting norms. Maximum trauma during MWL is encountered by lower body joints which absorb force proportional to the weight being lifted. Therefore, quantification of the injury potential of such tasks in terms of kinetic responses would prove beneficial for further designing of MWL tasks with reduced incidences of LBP.Aim: To quantify the kinetic responses of lifting tasks using real-time data collection technique and to find out whether real-time kinetics data corroborated with 2D prediction kinetics data analysed using simultaneously recorded 2D images of MWL.Materials and Methods: This cross-sectional pilot study was conducted on eight healthy participants. Hand grip strength, videos for prediction kinetics and real-time kinetics data were recorded with hand grip calliper, Sony handy cam, and Kistler Force Plate, respectively. Prediction kinetics data from still photographs were extracted and analysed using ergonomics evaluation software ErgoMaster. Real-time Kinetics data were analysed with BioWare(R) software. Repeated measure Analysis of Variance (ANOVA) followed by Bonferroni post-hoc test was applied for statistical treatment.Results: Some of the real-time and predicted kinetics data (mean±SEM) observed while lifting load at one lift per minute through different heights are given here. The Vertical component of Ground Reaction Forces (VGRF) while lifting 10 kg from Knuckle to Shoulder (K-S) height was 126.5±9.4 N which increased to 157.2±9.2 N for Floor to Knuckle (F-K) height and 178.4±7.4 N for Floor to Shoulder (F-S) height. Other conditions remaining same, while lifting 20 kg load the values of VGRF were 188.5±29.2 N, 270.6±16.0 N and 374.5±44.8 N, respectively. Under similar experimental conditions, the responses for Total Compression Force (TCF) while lifting 10 kg were 3095.22±218.5 N, 3892.9±204.1 N, 3886.1±190.40 N, respectively and similar trend was seen for 20 kg load also. Similar trends of significant changes were observed for all real-time and prediction kinetics parameters reported for lifting both 10 kg and 20 kg loads through F-K and F-S heights involving bending postures as compared to lifting at K-S height. This might be due to overload on spine and requirement for higher magnitudes of force absorption by lower body joints while undertaking such tasks.Conclusion: The study indicates that, according to both real-time and prediction kinetics data, lifting of loads up to 10 kg from knuckle to shoulder height at one lift per minute is with in acceptable limit. The lifting tasks involving excessive bending may result in higher spinal load leading to LBP.
机译：在不遵守起重规范的情况下执行起重任务时，手动举重（MWL）和下腰痛（LBP）紧密相关。下肢关节承受MWL期间的最大创伤，下肢关节吸收与举起的重量成比例的力。因此，就动力学响应而言，对此类任务的潜在伤害进行量化将有助于进一步设计降低LBP发生率的MWL任务。目标：使用实时数据收集技术对提升任务的动力学响应进行量化并找出实时动力学数据是否与使用同时记录的MWL 2D图像分析的2D预测动力学数据相符。材料与方法：这项横断面试验研究是对8位健康参与者进行的。分别用手握卡尺，Sony便携式凸轮和奇石乐测力板记录了手握力，用于预测动力学和实时动力学数据的视频。使用人体工程学评估软件ErgoMaster提取并分析静态照片中的预测动力学数据。实时动力学数据用BioWare软件进行分析。重复测量方差分析（ANOVA），然后进行Bonferroni事后检验进行统计学处理。结果：以每分钟一台电梯的速度提升负载时，观察到一些实时和预测的动力学数据（平均值±SEM）通过不同的高度在这里给出。当从指关节到肩膀（KS）的高度举起10 kg时，地面反作用力（VGRF）的垂直分量为126.5±9.4 N，对于地板到指关节（FK）的高度增加到157.2±9.2 N，对于地板到指关节的高度增加到178.4±7.4 N肩高（FS）。其他条件保持不变，当举起20 kg负载时，VGRF的值分别为188.5±29.2 N，270.6±16.0 N和374.5±44.8N。在相似的实验条件下，举起10 kg时的总压缩力（TCF）响应分别为3095.22±218.5 N，3892.9±204.1 N，3886.1±190.40 N，并且在20 kg载荷下也观察到相似的趋势。对于通过F-K和F-S高度举起10 kg和20 kg载荷并涉及弯曲姿势的举升，相比于在K-S高度举升，所有实时和预测动力学参数都观察到了相似的显着变化趋势。这可能是由于脊柱超负荷，以及在执行此类任务时需要下半身关节吸收较大量的力。结论：研究表明，根据实时和预测动力学数据，可以提升负荷以每分钟一提的速度从指关节到肩膀的高度增加到10公斤是可以接受的极限。涉及过度弯曲的提升任务可能导致较高的脊柱负荷，从而导致LBP。

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