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. Author manuscript; available in PMC: 2019 Jun 4.
Published in final edited form as: Ergonomics. 2008 Jul;51(7):1064–1077. doi: 10.1080/00140130801915220

Figure 3.

Figure 3.

Linear regression of subjective ratings of manual effort on grip force estimated using direct measurements of muscle activity (by electromyography), standardized to grip strength and stratified on presence/absence of wrist/hand symptoms at the time of measurement. MVC = maximum voluntary contraction.