Operating height and holding mode effects on psychophysical holding capacities in overhead work

作業高度與持住形式對於頭頂作業持住能力的影響

10.6848/JWL.202407_7(1).0004

Chien-Hsin Yang(楊健炘)；Swei-Pi Wu(吳水丕)

Manual materials handling ； holding task ； maximum acceptable weight of holding ； psychophysics ； 人工物料搬運 ； 持住作業 ； 最大可承受持住重量 ； 心理物理法

工作與休閒學刊

7卷1期（2024 / 07 / 01）

51 - 66

英文;繁體中文

This study investigates the effect of operating height and holding mode on psychophysically determined holding capacity related to Twenty-one Taiwanese young male were recruited to participate in this study. Independent variables include psychophysical method was used to operating height (elbow, shoulder and overreach heights) and holding mode (left, right and two hands). The response measures include maximum acceptable holding weight (MAWH), heart rate and rating of perceived exertion (RPE). Participants simulated overhead work to hold a box against a vertical surface for a three minutes holding time. The MAWH for overreach height was significantly greater than those of shoulder and elbow heights for about 12% and 22%, respectively. However, no significant effect was found on the heart rate and overall RPE. The effect of holding mode significantly influenced all measures. The MAWH for two hands was greater than those of right hand and left hand for about 31% and 40%, respectively. Further, participants perceived the most stressed body parts were the arms, shoulders, wrists and fingers. The high overall-RPE (13.31) and arms-RPE (16.34) indicated that the holding task is a very hard work. To minimize the potential risk of having MSDs at shoulder and upper extremity, ergonomically evaluated and redesigned holding task is needful.

本研究旨在探討作業高度與持住形式對於持住能力的影響。總共招募了21位男性受試者參與實驗。本實驗的自變數為作業高度（包含肘高、肩高以及過頭手及高）和持住形式（左手、右手及雙手），依變數為最大可承受持住重量（MAWH）、心搏率和主觀知覺評量（RPE）。受試者以箱子靠在垂直面上保持三分鐘，來模擬頭頂作業。結果顯示，過頭手及高的MAWH，明顯高於肩膀高（12%）以和肘高（22%），然而對於心搏率和全身RPE的影響並不顯著。持住形式對於各項配置有顯著的影響。雙手的MAWH明顯高於右手31%與左手（40%）。此外，受試者主觀感覺壓力最大的部位分別為手臂、肩膀、手腕以及手指。全身RPE（13.31）與手臂RPE（16.34）的研究結果表示持住作業是相當辛苦的作業，為了能夠有效減少肩膀及上肢的肌肉骨骼傷害，針對持住作業進行人因工程評估及工作再設計是相當有必要的。