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Updated: May 9, 2026

Force and Position Control in Humans - The Role of Augmented Feedback
Published on: June 19, 2016
The influence of task frequency and force direction on psychophysically acceptable forces in the context of the
Alan C Cudlip1, Steven L Fischer, Richard Wells
1Department of Kinesiology, University of Waterloo, Waterloo, Canada.
Abstract:
This study examined the influence of frequency and direction of force application on psychophysically acceptable forces for simulated work tasks. Fifteen male participants exerted psychophysically acceptable forces on a force transducer at 1, 3, or 5 repetitions per minute by performing both a downward press and a pull toward the body. These exertions were shown previously to be strength and balance limited, respectively. Workers chose acceptable forces at a lower percentage of their maximum voluntary force capacity during downward (strength-limited) exertions than during pulling (balance-limited) exertions at all frequencies (4% to 11%, P = .035). Frequency modulated acceptable hand force only during downward exertions, where forces at five repetitions per minute were 13% less (P = .005) than those at one exertion per minute. This study provides insight into the relationship between biomechanically limiting factors and the selection of acceptable forces for unilateral manual tasks.
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