Department of Industrial and Systems Engineering, Auburn University, Auburn, AL, USA.
Department of Mechanical Engineering, Auburn University, Auburn, AL, USA.
J Biomech. 2019 Sep 20;94:107-114. doi: 10.1016/j.jbiomech.2019.07.016. Epub 2019 Jul 25.
The proportions of older and obese people are increasing in both the general and working populations worldwide. Older and obese individuals are more susceptible to work-related musculoskeletal disorders (MSDs) in comparison with healthy, younger individuals. Manual material handling (MMH) is associated with the development of work-related MSDs. Although previous research has suggested that one-handed carrying is a particularly undesirable method of MMH, the effects of one-handed carrying on trunk kinetics and kinematics among older and/or obese people have not been adequately studied. The objective of this study was to examine the effects of age and obesity on trunk angles and moments during dominant side one-handed carrying of various load magnitudes. Twenty (20) participants divided into four groups with respect to age (young and older) and obesity (obese and non-obese) carried different loads (No-load [0 kg], Light [5.67 kg], and Heavy [10.21 kg]) in their dominant hand for approximately 6 m. Three-dimensional (3D) trunk angles and moments approximately about the L4/L5 vertebral segment were calculated using Visual3D. The findings indicated that while carrying a load in the dominant hand plays an important role in changing trunk kinematics and kinetics, the results were not dependent on age and/or obesity category. Absolute moments were greatest among participants in the obese groups; however, these moments were mitigated when normalized to body weight and height (%BW * Ht). Age did not exacerbate the effects of load magnitude on trunk kinetics and kinematics.
在全球范围内，无论是普通人群还是劳动人口，老年人和肥胖人群的比例都在增加。与健康的年轻人相比，老年人和肥胖人群更容易患上与工作相关的肌肉骨骼疾病（MSD）。体力搬运（MMH）与工作相关的 MSD 的发展有关。尽管先前的研究表明单手搬运是一种特别不理想的 MMH 方法，但单手搬运对老年人和/或肥胖人群的躯干动力学和运动学的影响尚未得到充分研究。本研究的目的是研究年龄和肥胖对单手搬运不同负荷大小的主导侧躯干角度和力矩的影响。20 名参与者根据年龄（年轻和年长）和肥胖（肥胖和非肥胖）分为四组，用主导手携带不同的负荷（无负荷[0kg]、轻负荷[5.67kg]和重负荷[10.21kg]），大约 6 米。使用 Visual3D 计算了大约 L4/L5 椎骨节段的三维（3D）躯干角度和力矩。研究结果表明，虽然在主导手中携带负荷对改变躯干运动学和动力学起着重要作用，但结果并不依赖于年龄和/或肥胖类别。肥胖组参与者的绝对力矩最大；然而，当将这些力矩归一化为体重和身高（%BW*Ht）时，这些力矩就会减轻。年龄并没有加剧负荷大小对躯干动力学和运动学的影响。
