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Sensory inflow manipulation induces learning-like phenomena in motor behavior

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European Journal of Applied Physiology Aims and scope Submit manuscript

Abstract

Purpose

Perceptual and goal-directed behaviors may be improved by repetitive sensory stimulations without practice-based training. Focal muscle vibration (f-MV) modulating the spatiotemporal properties of proprioceptive inflow is well-suited to investigate the effectiveness of sensory stimulation in influencing motor outcomes. Thus, in this study, we verified whether optimized f-MV stimulation patterns might affect motor control of upper limb movements.

Methods

To answer this question, we vibrated the slightly tonically contracted anterior deltoid (AD), posterior deltoid (PD), and pectoralis major muscles in different combinations in forty healthy subjects at a frequency of 100 Hz for 10 min in single or repetitive administrations. We evaluated the vibration effect immediately after f-MV application on upper limb targeted movements tasks, and one week later. We assessed target accuracy, movement mean and peak speed, and normalized Jerk using a 3D optoelectronic motion capture system. Besides, we evaluated AD and PD activity during the tasks using wireless electromyography.

Results

We found that f-MV may induce increases (p < 0.05) in movement accuracy, mean speed and smoothness, and changes (p < 0.05) in the electromyographic activity. The main effects of f-MV occurred overtime after repetitive vibration of the AD and PD muscles.

Conclusion

Thus, in healthy subjects, optimized f-MV stimulation patterns might over time affect the motor control of the upper limb movement.

This finding implies that f-MV may improve the individual’s ability to produce expected motor outcomes and suggests that it may be used to boost motor skills and learning during training and to support functional recovery in rehabilitation.

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Abbreviations

AD:

Anterior deltoid

Agon:

Agonist muscle vibration group

Agon 30:

Agonist muscle vibration by repetitive stimulations group

Anta:

Antagonist muscle vibration group

Anta 30:

Antagonist muscle vibration by repetitive stimulations group

CNS:

Central nervous system

EMG:

Electromyography

f-MV:

Focal muscle vibration

M1:

Motor cortex

NJ:

Normalized jerk

MVIC:

Maximal voluntary isometric contraction

PD:

Posterior deltoid

r:

Effect size estimation

Sham:

Sham stimulus group

S1:

Somatosensory cortex

sEMG:

Surface electromyography

References

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Funding

This work was supported by the Italian Ministry of Health (grant WFR RF-2011–02352379) and by the Fondazione Cassa di Risparmio di Perugia (grant 2015.0328.021).

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Authors and Affiliations

Authors

Contributions

RP, conceived and designed research; SC, AB, AF, CO, FC, conducted experiments; RP, SC, analyzed data; RP, SC, CVD, interpreted results of experiments; RP, drafted manuscript; RP, SC, CVD, JAS, AB, VEP, edited and revised manuscript. All authors read and approved the final version of manuscript.

Corresponding author

Correspondence to Roberto Panichi.

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Conflict of interest

The authors declare that they have no conflict of interest.

Additional information

Communicated by Lori Ann Vallis.

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Cite this article

Contemori, S., Dieni, C.V., Sullivan, J.A. et al. Sensory inflow manipulation induces learning-like phenomena in motor behavior. Eur J Appl Physiol 120, 811–828 (2020). https://doi.org/10.1007/s00421-020-04320-w

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  • DOI: https://doi.org/10.1007/s00421-020-04320-w

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