Kong Yong-Ku, Lee Ju-Hee, Shin Jae-Min, Shim Hyun-Ho, Kim Jae-Kyeong, Cho Min-Uk, Park Chae-Won, Choi Kyeong-Hee
Department of Industrial Engineering, Sungkyunkwan University, Suwon, Korea.
Work. 2019;62(1):21-26. doi: 10.3233/WOR-182838.
Measurement of hand exertion is very important to quantify the risk of Work-related Musculoskeletal Disorders (WMSDs) in manufacturing fields. Although a direct measurement is the most accurate way to quantify physical load, it is expensive and time consuming. To solve this limitation, a subjective self-report method has been proposed as a possible alternative.
The purpose of this study was to analyze the accuracy of subjective perception for grip force exertions associated with handedness (dominant and non-dominant hands).
A total of nine healthy adults participated in this study. All participants were asked to exert hand grip forces for randomly selected target force levels without any information about the actual target force levels. Then, participants were also asked to rate the subjective perception of their exertion level using % Maximum Voluntary Contraction (MVC) after each hand grip force exertion.
The trend of subjective perception for various target force levels was different according to the handedness. In the case of the dominant hand, participants tend to rate less MVC levels (under-estimation) than the actual target force levels at lower than 50% MVC, whereas they tend to rate more MVC levels (over-estimation) than the actual target force levels at higher than 50% MVC, respectively. In case of non-dominant hand, generally participants showed over-estimate for all levels of MVCs in this study.
According to the results of this study, subjective perception of exertion showed different patterns on the handedness (S-shape for dominant hand vs. over-estimation for non-dominant hand) for various target force levels. Therefore, it would be necessary to apply different criteria for each hand to evaluate subjective perception of hand grip exertion tasks.
测量手部用力对于量化制造业中与工作相关的肌肉骨骼疾病（WMSDs）风险非常重要。尽管直接测量是量化身体负荷最准确的方法，但它成本高昂且耗时。为了解决这一局限性，已提出一种主观自我报告方法作为一种可能的替代方法。
本研究的目的是分析与利手（优势手和非优势手）相关的握力用力主观感知的准确性。
共有九名健康成年人参与了本研究。要求所有参与者在不知道实际目标力水平的情况下，针对随机选择的目标力水平施加握力。然后，在每次施加握力后，还要求参与者使用最大自主收缩百分比（MVC）对其用力水平的主观感知进行评分。
根据利手不同，各种目标力水平的主观感知趋势有所不同。对于优势手，在低于50%MVC时，参与者倾向于给出低于实际目标力水平的MVC水平评分（低估），而在高于50%MVC时，他们倾向于给出高于实际目标力水平的MVC水平评分（高估）。对于非优势手，在本研究中，一般参与者对所有MVC水平都表现出高估。
根据本研究结果，对于各种目标力水平，用力的主观感知在利手方面表现出不同模式（优势手为S形，非优势手为高估）。因此，有必要针对每只手应用不同的标准来评估握力用力任务的主观感知。
