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Relationship between disturbances of CO2 homeostasis and force output characteristics during isometric knee extension.
Yunoki, Takahiro; Zang, Kejun; Hatano, Kei; Matsuura, Ryouta; Ohtsuka, Yoshinori.
Afiliación
  • Yunoki T; Department of Health and Physical Education, Graduate School of Education, Hokkaido University, Sapporo, Japan. Electronic address: yunoki@edu.hokudai.ac.jp.
  • Zang K; Department of Health and Physical Education, Graduate School of Education, Hokkaido University, Sapporo, Japan.
  • Hatano K; Japan Institute of Sports Sciences, Japan.
  • Matsuura R; Graduate School of Education, Joetsu University of Education, Japan.
  • Ohtsuka Y; Department of Sports and Human Studies, Sapporo International University, Japan.
Respir Physiol Neurobiol ; 315: 104119, 2023 09.
Article en En | MEDLINE | ID: mdl-37468055
To determine whether disturbances of CO2 homeostasis alter force output characteristics of lower limb muscles, participants performed four isometric knee extension trials (MVC30 %, 10 s each with 20-s rest intervals) in three CO2 conditions (normocapnia [NORM], hypercapnia [HYPER], and hypocapnia [HYPO]). Respiratory frequency and tidal volume were matched between CO2 conditions. In each MVC30 %, the participants exerted a constant force (30 % of maximum voluntary contraction [MVC]). The force coefficient of variation (Fcv) during each MVC30 % and MVC before and after the four MVC30 % trials were measured. For the means of the four trials, Fcv was significantly lower in HYPER than in HYPO. However, within HYPER, a significant positive correlation was found between the increase in end-tidal CO2 partial pressure and the increase in Fcv. MVCs in NORM and HYPO decreased significantly over the four trials, while no such reduction was observed in HYPER. These results suggest that perturbed CO2 homeostasis influences the force output characteristics independently of breathing pattern variables.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Dióxido de Carbono / Hipercapnia Límite: Humans Idioma: En Revista: Respir Physiol Neurobiol Año: 2023 Tipo del documento: Article Pais de publicación: Países Bajos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Dióxido de Carbono / Hipercapnia Límite: Humans Idioma: En Revista: Respir Physiol Neurobiol Año: 2023 Tipo del documento: Article Pais de publicación: Países Bajos