Enzo Piponnier1, Vincent Martin2, Pierre Bourdier2, Brice Biancarelli2, Virginie Kluka2,3, Sebastian Garcia-Vicencio2,4, Anne-Gaëlle Jegu5, Charlotte Cardenoux5, Cédric Morio3, Emmanuel Coudeyre5,6, Sébastien Ratel2. 1. Laboratoire AME2P (EA 3533), Université Clermont Auvergne, 63000, Clermont-Ferrand, France. e.piponnier@yahoo.com. 2. Laboratoire AME2P (EA 3533), Université Clermont Auvergne, 63000, Clermont-Ferrand, France. 3. Decathlon SportsLab, Villeneuve d'Asq, France. 4. Unité de Physiologie de l'Exercice et des Activités en Conditions Extrêmes, Département Environnements Opérationnels, Institut de Recherche Biomédicale des Armées, Brétigny-sur-Orge, France. 5. Clermont University Hospital, Clermont-Ferrand, France. 6. Université Clermont Auvergne, UNH, INRA, CRNH Auvergne, 63000, Clermont-Ferrand, France.
Abstract
PURPOSE: The aim of the present study was to investigate the role of maturation on the etiology of neuromuscular fatigue induced by repeated maximal voluntary isometric contractions (MVIC). METHODS: Nine prepubertal boys (9.9 ± 1.3 years), eight male adolescents (13.6 ± 1.3 years) and eleven men (23.4 ± 3.0 years) performed a series of repeated isometric MVICs of the knee extensors until the MVIC torque reached 60% of its initial value. Magnetic stimulations were delivered to the femoral nerve every five MVICs to follow the course of voluntary activation level (VA) and the potentiated twitch torque (Qtwpot). RESULTS: Task failure was reached after 52.9 ± 12.7, 42.6 ± 12.5, and 26.6 ± 6.3 repetitions in boys, adolescents and men, respectively. VA remained unchanged in men whereas it decreased significantly and similarly in boys and adolescents (p < 0.001). In contrast, Qtwpot remained unchanged in boys and decreased significantly less in adolescents than adults (p < 0.05). CONCLUSIONS: Children and adolescents experience less peripheral and more central fatigue than adults. However, adolescents experience more peripheral fatigue than children for a comparable amount of central fatigue. This finding supports the idea that the tolerance of the central nervous system to peripheral fatigue could increase during maturation.
PURPOSE: The aim of the present study was to investigate the role of maturation on the etiology of neuromuscular fatigue induced by repeated maximal voluntary isometric contractions (MVIC). METHODS: Nine prepubertal boys (9.9 ± 1.3 years), eight male adolescents (13.6 ± 1.3 years) and eleven men (23.4 ± 3.0 years) performed a series of repeated isometric MVICs of the knee extensors until the MVIC torque reached 60% of its initial value. Magnetic stimulations were delivered to the femoral nerve every five MVICs to follow the course of voluntary activation level (VA) and the potentiated twitch torque (Qtwpot). RESULTS: Task failure was reached after 52.9 ± 12.7, 42.6 ± 12.5, and 26.6 ± 6.3 repetitions in boys, adolescents and men, respectively. VA remained unchanged in men whereas it decreased significantly and similarly in boys and adolescents (p < 0.001). In contrast, Qtwpot remained unchanged in boys and decreased significantly less in adolescents than adults (p < 0.05). CONCLUSIONS:Children and adolescents experience less peripheral and more central fatigue than adults. However, adolescents experience more peripheral fatigue than children for a comparable amount of central fatigue. This finding supports the idea that the tolerance of the central nervous system to peripheral fatigue could increase during maturation.
Entities:
Keywords:
Adolescent; Central fatigue; Electromyography; Peripheral fatigue; Peripheral magnetic stimulation
Authors: Giedrius Gorianovas; Albertas Skurvydas; Vytautas Streckis; Marius Brazaitis; Sigitas Kamandulis; Malachy P McHugh Journal: Biomed Res Int Date: 2013-01-01 Impact factor: 3.411