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Power loss is attenuated following a second bout of high-intensity eccentric contractions due to the repeated bout effect's protection of rate of torque and velocity development.
Hinks, Avery; Hess, Adam; Debenham, Mathew I B; Chen, Jackey; Mazara, Nicole; Inkol, Keaton A; Cervone, Daniel T; Spriet, Lawrence L; Dalton, Brian H; Power, Geoffrey A.
Afiliación
  • Hinks A; Department of Human Health and Nutritional Sciences, College of Biological Sciences, University of Guelph, Guelph, ON N1G 2W1, Canada.
  • Hess A; Department of Human Health and Nutritional Sciences, College of Biological Sciences, University of Guelph, Guelph, ON N1G 2W1, Canada.
  • Debenham MIB; Department of Human Health and Nutritional Sciences, College of Biological Sciences, University of Guelph, Guelph, ON N1G 2W1, Canada.
  • Chen J; Department of Human Health and Nutritional Sciences, College of Biological Sciences, University of Guelph, Guelph, ON N1G 2W1, Canada.
  • Mazara N; Department of Human Health and Nutritional Sciences, College of Biological Sciences, University of Guelph, Guelph, ON N1G 2W1, Canada.
  • Inkol KA; Department of Human Health and Nutritional Sciences, College of Biological Sciences, University of Guelph, Guelph, ON N1G 2W1, Canada.
  • Cervone DT; Department of Systems Design Engineering, University of Waterloo, Waterloo, ON N2L 3G1, Canada.
  • Spriet LL; Department of Human Health and Nutritional Sciences, College of Biological Sciences, University of Guelph, Guelph, ON N1G 2W1, Canada.
  • Dalton BH; Department of Human Health and Nutritional Sciences, College of Biological Sciences, University of Guelph, Guelph, ON N1G 2W1, Canada.
  • Power GA; School of Health and Exercise Sciences, The University of British Columbia, Kelowna, BC V1V 1V7, Canada.
Appl Physiol Nutr Metab ; 46(5): 461-472, 2021 May.
Article en En | MEDLINE | ID: mdl-33125854
ABSTRACT
High-intensity unaccustomed eccentric contractions result in weakness and power loss because of fatigue and muscle damage. Through the repeated bout effect (RBE), adaptations occur, then damage and weakness are attenuated following a subsequent bout. However, it is unclear whether the RBE protects peak power output. We investigated the influence of the RBE on power production and estimated fatigue- and damage-induced neuromuscular impairments following repeated high-intensity eccentric contractions. Twelve healthy adult males performed 5 sets of 30 maximal eccentric elbow flexions and repeated an identical bout 4 weeks later. Recovery was tracked over 7 days following both bouts. Reduced maximum voluntary isometric contraction torque, and increased serum creatine kinase and self-reported soreness indirectly inferred muscle damage. Peak isotonic power, time-dependent measures - rate of velocity development (RVD) and rate of torque development (RTD) - and several electrophysiological indices of neuromuscular function were assessed. The RBE protected peak power, with a protective index of 66% 24 h after the second eccentric exercise bout. The protection of power also related to preserved RVD (R2 = 0.61, P < 0.01) and RTD (R2 = 0.39, P < 0.01). Furthermore, the RBE's protection against muscle damage permitted the estimation of fatigue-associated neuromuscular performance decrements following eccentric exercise. Novelty The repeated bout effect protects peak isotonic power. Protection of peak power relates to preserved rates of torque and velocity development, but more so rate of velocity development. The repeated bout effect has little influence on indices of neuromuscular fatigue.
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Texto completo: 1 Bases de datos: MEDLINE Asunto principal: Adaptación Fisiológica / Músculo Esquelético / Fatiga Muscular / Mialgia / Contracción Muscular Límite: Adult / Humans / Male Idioma: En Revista: Appl Physiol Nutr Metab Asunto de la revista: CIENCIAS DA NUTRICAO / FISIOLOGIA / MEDICINA ESPORTIVA / METABOLISMO Año: 2021 Tipo del documento: Article País de afiliación: Canadá

Texto completo: 1 Bases de datos: MEDLINE Asunto principal: Adaptación Fisiológica / Músculo Esquelético / Fatiga Muscular / Mialgia / Contracción Muscular Límite: Adult / Humans / Male Idioma: En Revista: Appl Physiol Nutr Metab Asunto de la revista: CIENCIAS DA NUTRICAO / FISIOLOGIA / MEDICINA ESPORTIVA / METABOLISMO Año: 2021 Tipo del documento: Article País de afiliación: Canadá