Journal article
Neuromuscular adjustments of the quadriceps muscle after repeated cycling sprints
PLoS ONE, Vol.8(5)
2013
Abstract
PURPOSE:
This study investigated the supraspinal processes of fatigue of the quadriceps muscle in response to repeated cycling sprints.
METHODS:
Twelve active individuals performed 10 × 6-s "all-out" sprints on a cycle ergometer (recovery = 30 s), followed 6 min later by 5 × 6-s sprints (recovery = 30 s). Transcranial magnetic and electrical femoral nerve stimulations during brief (5-s) and sustained (30-s) isometric contractions of the knee extensors were performed before and 3 min post-exercise.
RESULTS:
Maximal strength of the knee extensors decreased during brief and sustained contractions (~11% and 9%, respectively; P<0.001). Peripheral and cortical voluntary activation, motor evoked potential amplitude and silent period duration responses measured during briefs contractions were unaltered (P>0.05). While cortical voluntary activation declined (P<0.01) during the sustained maximal contraction in both test sessions, larger reductions occurred (P<0.05) after exercise. Lastly, resting twitch amplitude in response to both femoral nerve and cortical stimulations was largely (> 40%) reduced (P<0.001) following exercise.
CONCLUSION:
The capacity of the motor cortex to optimally drive the knee extensors following a repeated-sprint test was shown in sustained, but not brief, maximal isometric contractions. Additionally, peripheral factors were largely involved in the exercise-induced impairment in neuromuscular function, while corticospinal excitability was well-preserved.
Details
- Title
- Neuromuscular adjustments of the quadriceps muscle after repeated cycling sprints
- Authors/Creators
- O. Girard (Author/Creator) - Qatar Orthopaedic and Sports Medicine HospitalD.J. Bishop (Author/Creator) - Australian Institute of SportS. Racinais (Author/Creator) - Qatar Orthopaedic and Sports Medicine Hospital
- Publication Details
- PLoS ONE, Vol.8(5)
- Publisher
- Public Library of Science
- Identifiers
- 991005541023907891
- Copyright
- © 2013 Girard et al.
- Murdoch Affiliation
- Murdoch University
- Language
- English
- Resource Type
- Journal article
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- Collaboration types
- International collaboration
- Citation topics
- 1 Clinical & Life Sciences
- 1.172 Sports Science
- 1.172.648 Exercise Physiology
- Web Of Science research areas
- Physiology
- ESI research areas
- Biology & Biochemistry