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Electrocortical activity during stretch reflex in athletes

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Abstract

Background

To evaluate timing and characteristics of electrocortical activity during stretch reflex evocation of the quadriceps femoris at different body postures.

Methods

Twenty athletes were subjected to reflex hammer percussions on patellar tendon, in a random time sequence, in seated and supine decubitus postures. 745 ms of acquisition were evaluated for data analysis: 200 ms of pre-stimulation, 45 ms relative to the elapsed time from stimulation to the end of the muscular contraction, and 500 ms of post-stimulation. First, a scalp-map analysis, considering channels data, was performed; second, independent component analysis decomposition was applied to all 16 channels. To highlight the differences among two conditions (pre- and post-stimulation) and two sessions (seated and supine decubitus postures), a two-way analysis of variance was used. Time–frequency analysis has been applied to identify the density of the frequencies as a function of the time, instant by instant.

Results

Fast alpha, beta, and gamma frequency bands showed a greater electroencephalographic activity after the stimulation. Seated posture showed a greater activation than the decubitus supine posture. Time frequency analysis highlighted an higher electrocortical activation for 160 ms as well as from about 250–300 ms at all frequency bands after the stimulation.

Conclusions

Our findings improve the understanding of the neurophysiological dynamics following the stretch reflex after concussion of the patellar tendon, executed in different postures, considering scalp-map, power spectra, and timing of activation. The use of scalp-map and power spectra analysis techniques represents a sophisticated use of advanced signal processing methodologies to analyze brain activity during movement and in specificity in sport science.

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Abbreviations

ANOVA:

Analysis of variance

CNS:

Central nervous system

EEG:

Electroencephalography

EMG:

Electromyography

PNS:

Peripheral nervous system

ROI:

Region of interest

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Authors and Affiliations

Authors

Contributions

MI contributed to the experimental design, undertook the data collection, interpreted the results, and drafted the manuscript. FP undertook the data collection and analyzed the literature. GC performed the data analysis, conceived the statistical analysis, interpreted the results, and revised the manuscript. All authors read and approved the final manuscript.

Corresponding author

Correspondence to Giovanni Cugliari.

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Conflict of interest

The authors declare that they have no conflict of interest.

Ethical approval

Our study complies with the Declaration of Helsinki principles and conforms to ethical requirements. The study protocol was approved by the Ethics Committee of the Department of Medical Sciences, University of Turin.

Informed consent

All volunteers signed an informed consent form at enrollment.

Electronic supplementary material

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11332_2018_471_MOESM1_ESM.png

Statistically significant differences, for all EEG bands and for all channels, in the two conditions, between the pre-trigger and the post-trigger (PNG 5861 KB)

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Ivaldi, M., Pretari, F. & Cugliari, G. Electrocortical activity during stretch reflex in athletes. Sport Sci Health 14, 625–631 (2018). https://doi.org/10.1007/s11332-018-0471-0

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  • DOI: https://doi.org/10.1007/s11332-018-0471-0

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