Department of Kinesiology, California State University San Marcos, 333 S. Twin Oaks Valley Rd., San Marcos, CA, USA.
Department of Kinesiology, California State University San Marcos, 333 S. Twin Oaks Valley Rd., San Marcos, CA, USA.
Appl Ergon. 2021 Nov;97:103505. doi: 10.1016/j.apergo.2021.103505. Epub 2021 Jun 25.
This study aimed to characterize the effects of walking with backpack load on upper limb function. Fifteen males participated in 3 conditions: no load, 40% body weight loaded backpack (BP) and loaded backpack with simulated rifle (BRC). Pinch strength, grip strength, sensory threshold, blood flow volume, and a manual dexterity test were assessed before and after a 45-min walking trial. Pinch strength in the BP condition was significantly different than the control (p < 0.05). Grooved pegboard times were faster after a seated recovery (p = 0.026) than immediately after walking with load. Blood flow was significantly decreased to <53% of baseline (p ≤ 0.001) in BP and BRC immediately after donning the backpack. No significant changes in grip strength or sensory threshold were measured among conditions or time points. In conclusion, pinch strength, manual dexterity and blood flow were affected by backpack carriage, but other upper limb measures remained unaffected.
本研究旨在描述背负背包负荷对上肢功能的影响。15 名男性参与了 3 种条件：无负荷、40%体重的背包（BP）和模拟步枪的背包（BRC）。在 45 分钟步行试验前后评估了捏力、握力、感觉阈值、血流体积和手动灵巧性测试。BP 条件下的捏力与对照组相比有显著差异（p<0.05）。在坐姿恢复后，滚花钉板时间明显加快（p=0.026），而在负荷后立即行走则没有加快。穿戴背包后，BP 和 BRC 中的血流明显下降至基线的<53%（p≤0.001）。在条件或时间点之间，握力或感觉阈值均无显著变化。总之，背包携带会影响捏力、手的灵巧性和血流量，但其他上肢指标不受影响。
