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Perceived level of exertion compared to actual grip force exertion: The 50% phenomenon
Author(s) -
Kong YongKu,
Lee JunHyub,
Lee JuHee,
Shin JaeMin,
Choi KyeongHee
Publication year - 2019
Publication title -
human factors and ergonomics in manufacturing and service industries
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.408
H-Index - 39
eISSN - 1520-6564
pISSN - 1090-8471
DOI - 10.1002/hfm.20808
Subject(s) - exertion , perceived exertion , physical medicine and rehabilitation , intensity (physics) , psychology , physical therapy , task (project management) , medicine , engineering , physics , heart rate , quantum mechanics , blood pressure , systems engineering
The purpose of this study was to evaluate perceived exertions for various levels of actual exertion. A total of 40 healthy adults participated. They repeatedly performed the task of exerting a grip force for 5 s, following the target force on a screen. Then, they were asked to evaluate the intensity of each task based on Borg's CR‐10 scale. The results of this study indicated that participants tend to underestimate their grip‐force exertion at low target‐force levels (10–40% maximum voluntary contraction [MVC]), whereas overestimation was found at high target‐force levels (60–80% MVC). Interestingly, perceived exertion was very accurate at a target‐force level of 50% MVC (the 50% phenomenon). Based on these results, regression equations were derived to estimate the actual exertion of grip force from a perceived exertion. The Borg's CR‐10 scale for grip force was revised based on the regression equations.