Endurance Trained Athletes Do Not per se Have Higher Hoffmann Reflexes Than Recreationally Active Controls

Bertschinger, Raphael; Giboin, Louis-Solal; Gruber, Markus

Endurance Trained Athletes Do Not per se Have Higher Hoffmann Reflexes Than Recreationally Active Controls

Dateien

Bertschinger_2-1d0gssp0vrn8k1.pdfGröße: 1.11 MBDownloads: 109

Datum

2021

Open Access-Veröffentlichung

Open Access Gold

Sammlungen

Sportwissenschaft

Publikationstyp

Zeitschriftenartikel

Publikationsstatus

Published

Erschienen in

Frontiers in Physiology. Frontiers Research Foundation. 2021, 12, 736067. eISSN 1664-042X. Available under: doi: 10.3389/fphys.2021.736067

Zusammenfassung

The impact of endurance training on spinal neural circuitries remains largely unknown. Some studies have reported higher H-reflexes in endurance trained athletes and therefore, adaptations within the Ia afferent pathways after long term endurance training have been suggested. In the present study we tested the hypothesis that cyclists (n = 12) demonstrate higher Hoffmann reflexes (H-reflexes) compared to recreationally active controls (n = 10). Notwithstanding, highly significant differences in endurance performance (VO_2peak: 60.6 for cyclists vs. 46.3 ml/min/kg for controls (p < 0.001) there was no difference in the size of the SOL H-reflex between cyclists and controls (H_max/M_max ratio 61.3 vs. 60.0%, respectively (p = 0.840). Further analyses of the H and M recruitment curves for SOL revealed a significant steeper slope of the M recruitment curve in the group of cyclists (76.2 ± 3.8° vs. 72.0 ± 4.4°, p = 0.046) without a difference in the H-recruitment curve (84.6 ± 3.0° vs. 85.0 ± 2.8°, p = 0.784) compared to the control group. Cycling is classified as an endurance sport and thus the findings of the present study do not further support the assumption that long-term aerobic training leads to a general increase of the H-reflex. Amongst methodological differences in assessing the H-reflex, the training-specific sensorimotor control of the endurance sport itself might differently affect the responsiveness of spinal motoneurons on Ia-afferent inputs.

Fachgebiet (DDC)

796 Sport

Schlagwörter

H-reflex, recruitment curve, spinal plasticity, sigmoidal fit, endurance athletes, cycling

Zitieren

ISO 690

BERTSCHINGER, Raphael, Louis-Solal GIBOIN, Markus GRUBER, 2021. Endurance Trained Athletes Do Not per se Have Higher Hoffmann Reflexes Than Recreationally Active Controls. In: Frontiers in Physiology. Frontiers Research Foundation. 2021, 12, 736067. eISSN 1664-042X. Available under: doi: 10.3389/fphys.2021.736067

BibTex

@article{Bertschinger2021Endur-55782,
  year={2021},
  doi={10.3389/fphys.2021.736067},
  title={Endurance Trained Athletes Do Not per se Have Higher Hoffmann Reflexes Than Recreationally Active Controls},
  volume={12},
  journal={Frontiers in Physiology},
  author={Bertschinger, Raphael and Giboin, Louis-Solal and Gruber, Markus},
  note={Article Number: 736067}
}

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    <dcterms:abstract xml:lang="eng">The impact of endurance training on spinal neural circuitries remains largely unknown. Some studies have reported higher H-reflexes in endurance trained athletes and therefore, adaptations within the Ia afferent pathways after long term endurance training have been suggested. In the present study we tested the hypothesis that cyclists (n = 12) demonstrate higher Hoffmann reflexes (H-reflexes) compared to recreationally active controls (n = 10). Notwithstanding, highly significant differences in endurance performance (VO&lt;sub&gt;2peak&lt;/sub&gt;: 60.6 for cyclists vs. 46.3 ml/min/kg for controls (p &lt; 0.001) there was no difference in the size of the SOL H-reflex between cyclists and controls (H&lt;sub&gt;max&lt;/sub&gt;/M&lt;sub&gt;max&lt;/sub&gt; ratio 61.3 vs. 60.0%, respectively (p = 0.840). Further analyses of the H and M recruitment curves for SOL revealed a significant steeper slope of the M recruitment curve in the group of cyclists (76.2 ± 3.8° vs. 72.0 ± 4.4°, p = 0.046) without a difference in the H-recruitment curve (84.6 ± 3.0° vs. 85.0 ± 2.8°, p = 0.784) compared to the control group. Cycling is classified as an endurance sport and thus the findings of the present study do not further support the assumption that long-term aerobic training leads to a general increase of the H-reflex. Amongst methodological differences in assessing the H-reflex, the training-specific sensorimotor control of the endurance sport itself might differently affect the responsiveness of spinal motoneurons on Ia-afferent inputs.</dcterms:abstract>
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