Electrically-induced quadriceps fatigue in the contralateral leg impairs ipsilateral knee extensors performance
Autor: | Massimo Venturelli, Emine Kirmizi, Gaia Giuriato, Federico Ruzzante, Chiara Barbi, Fabio Giuseppe Laginestra, Camilla Martignon, Cantor Tarperi, Markus Amann, Anna Pedrinolla, Federico Schena |
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Jazyk: | angličtina |
Rok vydání: | 2021 |
Předmět: |
Adult
Male medicine.medical_specialty Knee Joint Physiology Quadriceps Muscle 03 medical and health sciences 0302 clinical medicine Physical medicine and rehabilitation Physiology (medical) Medicine Humans Knee central command Muscle Skeletal electrical stimulation Exercise Leg Knee extensors Muscle fatigue business.industry Electromyography group III and IV afferents 030229 sport sciences muscle fatigue business 030217 neurology & neurosurgery Central command Electrical stimulation Group III and IV afferents Muscle Contraction Research Article |
Zdroj: | Am J Physiol Regul Integr Comp Physiol |
Popis: | Muscle fatigue induced by voluntary exercise, which requires central motor drive, causes central fatigue that impairs endurance performance of a different, nonfatigued muscle. This study investigated the impact of quadriceps fatigue induced by electrically induced (no central motor drive) contractions on single-leg knee-extension (KE) performance of the subsequently exercising ipsilateral quadriceps. On two separate occasions, eight males completed constant-load (85% of maximal power-output) KE exercise to exhaustion. In a counterbalanced manner, subjects performed the KE exercise with no pre-existing quadriceps fatigue in the contralateral leg on one day (No-PreF), whereas on the other day, the same KE exercise was repeated following electrically induced quadriceps fatigue in the contralateral leg (PreF). Quadriceps fatigue was assessed by evaluating pre- to postexercise changes in potentiated twitch force (ΔQtw,pot; peripheral fatigue), and voluntary muscle activation (ΔVA; central fatigue). As reflected by the 57 ± 11% reduction in electrically evoked pulse force, the electrically induced fatigue protocol caused significant knee-extensors fatigue. KE endurance time to exhaustion was shorter during PreF compared with No-PreF (4.6 ± 1.2 vs 7.7 ± 2.4 min; P < 0.01). Although ΔQtw,pot was significantly larger in No-PreF compared with PreF (−60% vs −52%, P < 0.05), ΔVA was greater in PreF (−14% vs −10%, P < 0.05). Taken together, electrically induced quadriceps fatigue in the contralateral leg limits KE endurance performance and the development of peripheral fatigue in the ipsilateral leg. These findings support the hypothesis that the crossover effect of central fatigue is mainly mediated by group III/IV muscle afferent feedback and suggest that impairments associated with central motor drive may only play a minor role in this phenomenon. |
Databáze: | OpenAIRE |
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