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The type of visual biofeedback influences maximal handgrip strength and activation strategies

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Abstract

Purpose

This study investigated the effects of force and electromyographic (EMG) feedbacks on forearm muscle activations and handgrip maximal isometric voluntary contraction (MIVC).

Methods

Sixteen males performed a set of MIVC in four different feedback conditions: (1) NO-FB: no feedback is given to the participant; (2) FORCE-FB: participants received a visual feedback of the produced force; (3) AGO-FB: participants received a visual feedback of the EMG activity of two agonist grip muscles; (4) ANTAGO-FB: participants received a visual feedback of the EMG activity of two hand extensors muscles. Each feedback was displayed by monitoring the signal of either force or electrical activity of the corresponding muscles.

Results

Compared to NO-FB, FORCE-FB was associated with a higher MIVC force (+ 11%, P < 0.05), a higher EMG activity of agonist and antagonist muscles (+ 8.7% and + 9.2%, respectively, P < 0.05) and a better MIVC/EMG ratio with the agonist muscles (P < 0.05). AGO-FB was associated with a higher EMG activity of agonist muscles (P < 0.05) and ANTAGO-FB was associated with a higher EMG activity of antagonist muscles (P < 0.05). MIVC force was higher in the agonist feedback condition than in the antagonist feedback condition (+ 5.9%, P < 0.05).

Conclusion

Our results showed that the MIVC force can be influenced by different visuals feedback, such as force or EMG feedbacks. Moreover, these results suggested that the type of feedback employed could modify the EMG-to-force relationships. Finally, EMG biofeedback could represent an interesting tool to optimize motor strategies. But in the purpose of performing the highest strength independently of the strategy, the force feedback should be recommended.

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Abbreviations

AGO FB:

Agonist muscles feedback condition

ANOVA:

Analysis of variance

ANTAGO FB:

Antagonist muscles feedback condition

EDS:

Extensor digitori superficialis

EDU:

Extensor digitori ulnaris

EMG:

Electromyography

FDS:

Flexor digitorum superficialis

FORCE FB:

Force feedback condition

MIVC:

Maximal isometric voluntary contractions

NO FB:

No feedback condition

PL:

Palmaris Longus

RMS:

Root mean square

SD:

Standard deviation

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Funding

The authors did not receive support from any organization for the submitted work.

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Authors

Contributions

SG designed the study, conducted experimentations and analysed the data. SG and PMM wrote the manuscript. PG, AG and GR revised the manuscript. All authors read and approved the manuscript.

Corresponding author

Correspondence to Sidney Grospretre.

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Conflict of interest

The authors declare that they have no conflict of interest. The authors declare that the results of the study are presented clearly, honestly, and without fabrication, falsification, or inappropriate data manipulation.

Ethical approval

This study was conducted in accordance with the recommendations of the 1964 Declaration of Helsinki and its later amendments. The research plan was examined and approved by the local ethical committee.

Consent to participate

Prior to testing, all participants gave a voluntary written informed consent which indicated the purpose, the benefits and the risks of the investigation and the possibility stopping their participation at any time.

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Communicated by Lori Ann Vallis.

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Marcel-Millet, P., Gimenez, P., Groslambert, A. et al. The type of visual biofeedback influences maximal handgrip strength and activation strategies. Eur J Appl Physiol 121, 1607–1616 (2021). https://doi.org/10.1007/s00421-021-04640-5

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