Spinal Cord Excitability and Sprint Performance Are Enhance by Sensory Stimulation During Cycling

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dc.contributor.authorPearcey, Gregory E. P.
dc.contributor.authorNoble, Steven A.
dc.contributor.authorMunro, Bridget
dc.contributor.authorZehr, E. Paul
dc.date.accessioned2019-03-13T05:25:51Z
dc.date.available2019-03-13T05:25:51Z
dc.date.copyright2017en_US
dc.date.issued2017
dc.description.abstractSpinal cord excitability, as assessed by modulation of Hoffmann (H-) reflexes, is reduced with fatiguing isometric contractions. Furthermore, spinal cord excitability is reduced during non-fatiguing arm and leg cycling. Presynaptic inhibition of Ia terminals is believed to contribute to this suppression of spinal cord excitability. Electrical stimulation to cutaneous nerves reduces Ia presynaptic inhibition, which facilitates spinal cord excitability, and this facilitation is present during arm cycling. Although it has been suggested that reducing presynaptic inhibition may prolong fatiguing contractions, it is unknown whether sensory stimulation can alter the effects of fatiguing exercise on performance or spinal cord excitability. Thus, the aim of this experiment was to determine if sensory stimulation can interfere with fatigue-related suppression of spinal cord excitability, and alter fatigue rates during cycling sprints. Thirteen participants randomly performed three experimental sessions that included: unloaded cycling with sensory stimulation (CONTROL + STIM), sprints with sensory stimulation (SPRINT + STIM) and sprints without stimulation (SPRINT). Seven participants also performed a fourth session (CONTROL), which consisted of unloaded cycling. During SPRINT and SPRINT + STIM, participants performed seven, 10 s cycling sprints interleaved with 3 min rest. For CONTROL and CONTROL + STIM, participants performed unloaded cycling for similar to 30 min. During SPRINT + STIM and CONTROL + STIM, participants received patterned sensory stimulation to nerves of the right foot. H-reflexes and M-waves of the right soleus were evoked by stimulation of the tibial nerve at multiple time points throughout exercise. Sensory stimulation facilitated soleus H-reflexes during unloaded cycling, whereas sprints suppressed soleus H-reflexes. While receiving sensory stimulation, there was less suppression of soleus H-reflexes and slowed reduction in average power output, compared to sprints without stimulation. These results demonstrate that sensory stimulation can substantially mitigate the fatiguing effects of sprints.en_US
dc.description.reviewstatusRevieweden_US
dc.description.scholarlevelFacultyen_US
dc.description.sponsorshipSupport for this research was provided by a doctoral fellowship from the Natural Sciences and Engineering Research Council of Canada (GEPP), and by funding from the Natural Sciences and Engineering Research Council of Canada (NSERC) and the Nike Sport Research Laboratory (EPZ).en_US
dc.identifier.citationPearcey, G. E. P.; Noble, S. A.; Munro, B.; & Zehr, E. P. (2017). Spinal cord excitability and sprint performance are enhance by sensory stimulation during cycling. Frontiers in Human Neuroscience, 11, article 612. DOI: 10.3389/fnhum.2017.00612en_US
dc.identifier.urihttps://doi.org/10.3389/fnhum.2017.00612
dc.identifier.urihttp://hdl.handle.net/1828/10648
dc.language.isoenen_US
dc.publisherFrontiers in Human Neuroscienceen_US
dc.subjectH-reflexen_US
dc.subjectsensory stimulationen_US
dc.subjectfatigueen_US
dc.subjectspinal cord excitabilityen_US
dc.subjectsprintsen_US
dc.subjectcyclingen_US
dc.titleSpinal Cord Excitability and Sprint Performance Are Enhance by Sensory Stimulation During Cyclingen_US
dc.typeArticleen_US

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