Wu Swei-Pi, Loiu Yi, Chien Te Hong
Department of Industrial Engineering and Management Information, Huafan University, Taiwan.
Ind Health. 2015;53(5):410-6. doi: 10.2486/indhealth.2014-0244. Epub 2015 Jul 23.
This study utilizes a psychophysical approach to examine the effects on carrying capacity for bi-manual carrying tasks involving different handle positions and carrying ranges. A total of 16 female subjects participated in the experiment in groups of two people, and each group of subjects performed the tasks in a random order with 12 different combinations of carrying task. The independent variables are handle position (upper, middle, lower) and carrying range (F-F: floor height carried to floor height, F-W: floor height carried to waist height, W-W: waist height carried to waist height, W-F: waist height carried to floor height), the dependent variable is the maximum acceptable carried weight (MAWC), heart rate (HR), and the rating of perceived exertion (RPE). The results show that the handle position has a significant effect on MAWC and overall RPE but no significant effect on HR. Carrying range has a significant effect on the MAWC and HR, but no significant effect on overall HR. The handle position and carrying range have a significant interaction on the MAWC and HR. The RPE for different body parts shows significant differences, and the hands feel the most tired. Overall, this study confirms that the lower handle position with the W-W carrying range is the best combination for a two-person carrying task.
本研究采用心理物理学方法，以检验不同手柄位置和搬运范围的双手搬运任务对承载能力的影响。共有16名女性受试者两人一组参与实验，每组受试者以随机顺序执行包含12种不同搬运任务组合的任务。自变量为手柄位置（上、中、下）和搬运范围（F-F：从地面高度搬运至地面高度、F-W：从地面高度搬运至腰部高度、W-W：从腰部高度搬运至腰部高度、W-F：从腰部高度搬运至地面高度），因变量为最大可接受搬运重量（MAWC）、心率（HR）和主观用力程度评分（RPE）。结果表明，手柄位置对MAWC和总体RPE有显著影响，但对HR无显著影响。搬运范围对MAWC和HR有显著影响，但对总体RPE无显著影响。手柄位置和搬运范围对MAWC和HR有显著交互作用。不同身体部位的RPE存在显著差异，手部感觉最疲劳。总体而言，本研究证实，对于两人搬运任务，手柄位置较低且搬运范围为W-W是最佳组合。
