Department of Orthopaedic Surgery, University of Arkansas for Medical Science, Little Rock, AR 72205, USA.
Department of Health and Human Performance, University of Montana Western, Dillon, MT 59725, USA.
Int J Environ Res Public Health. 2021 Apr 25;18(9):4549. doi: 10.3390/ijerph18094549.
The purpose of this study was to investigate the effect of different load carriage modes on coordinative patterns in the lower extremities during walking. Twenty-five university students walked on a treadmill at their preferred pace under three different load conditions: symmetric load (5% of body mass in messenger bags on each shoulder hanging vertically and against the hips), asymmetric load 1 (10% of body mass in a messenger bag on one shoulder hanging vertically against the ipsilateral hip), and asymmetric load 2 (10% of body mass in a messenger bag on one shoulder with the bag draped across the trunk to the contralateral hip). Altered thigh-shank and shank-foot couplings were found for the loaded side during the stance of gait when comparing the asymmetric 1 and 2 to the symmetric load. In addition, thigh-thigh coupling was changed during gait when comparing the asymmetric load 2 and symmetric load. However, we did not find any significant differences in intralimb and interlimb couplings between the two different asymmetric load conditions. The results suggest potential benefits when carrying symmetrical loads in order to decrease abnormal limb coordination in daily activities. Thus, it may be advisable to distribute load more symmetrically to avoid abnormal gait.
本研究旨在探讨不同负重方式对行走时下肢协调模式的影响。25 名大学生在跑步机上以自己喜欢的速度行走，分别在三种不同负重条件下进行：对称负重（双肩各挂一个垂直于臀部的背包，每个背包负重 5%的体重）、不对称负重 1（单侧肩挂一个背包，负重 10%的体重，背包垂直于同侧臀部）和不对称负重 2（单侧肩挂一个背包，将包搭在躯干上至对侧臀部，负重 10%的体重）。与对称负重相比，在不对称负重 1 和 2 时，负重侧在步态站立期出现了大腿-小腿和小腿-足的耦合改变。此外，与对称负重相比，在步态中大腿-大腿的耦合也发生了改变。然而，我们没有发现两种不同的不对称负重条件之间在肢体内和肢体间的耦合上有任何显著差异。研究结果表明，在日常活动中，以对称方式负重可能有助于减少异常的肢体协调，因此，为了避免异常步态，建议更对称地分配负重。
