Internationale Zeitschrift für Physikalische Medizin und Rehabilitation
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Randomized Control Trial: Pilot Study Testing Handgrip Strength Affected by Augmented Feedbacks

Huda Alotaibi*, Aisha Sheikh, Chutima Phanpho, Gazal Bahrawi, Lama Basri, Wan Ling, Wei Guo

Background: Hand grip strength is a standard method to measure impairment, which is a component of body function of high importance. Feedback appears to affect the performance of hand grip strength.

Objectives: To determine the effects on peak grip force with the use of visual feedback, visual conflicted feedback and without feedback, using a hand held dynamometer.

Study design: One group repeated measures design.

Case presentation: Data was collected from healthy subjects aged from 21 to 35 on the effect of feedback conditions. Subjects received counter-balanced block design test their peak grip force with three conditions, visual feedback, visual conflicted feedback and without feedback, on the same day. Hand held dynamometer was used for measuring and recording the peak grip force. The repeated measure analysis of variance was used to investigate the effect of feedback conditions within subject.

Result: 16 healthy subjects were recruited, 3 were excluded because they didn’t meet the inclusion criteria in the screening process, and 3 were excluded due to unsustainability of the data. The average peak grip force for without feedback was (54.22 ± 4.0) lbs., for visual feedback was (62.59 ± 3.9) lbs., and for visual conflicted feedback was (53.22 ± 3.9) lbs. There were statistically significant differences between visual feedback and visual conflicted feedback (P=0.001), and between visual feedback and without feedback conditions (P=0.015). There was no statistically significant correlation between visual learning preference score and visual feedback.

Conclusion: subjects exerted higher peak grip force when visual feedback was provided than without feedback or visual conflicted feedback. Therefore, clinicians may benefit from using visual feedback in clinical practice.

Limitation: the way that visual conflicted feedback was provided was different from the way the literature described.