Remote ischemic preconditioning delays fatigue development during handgrip exercise

Remote ischemic preconditioning delays fatigue development during handgrip exercise

Autor Barbosa, T. C. Google Scholar
Machado, A. C. Google Scholar
Braz, I. D. Google Scholar
Fernandes, I. A. Google Scholar
Vianna, L. C. Google Scholar
Nobrega, A. C. L. Google Scholar
Silva, B. M. Autor UNIFESP Google Scholar
Instituição Universidade Federal Fluminense (UFF)
Universidade Federal de São Paulo (UNIFESP)
Resumo Ischemic preconditioning (IPC) of one or two limbs improves performance of exercise that recruits the same limb(s). However, it is unclear whether IPC application to another limb than that in exercise is also effective and which mechanisms are involved. We investigated the effect of remote IPC (RIPC) on muscle fatigue, time to task failure, forearm hemodynamics, and deoxygenation during handgrip exercise. Thirteen men underwent RIPC in the lower limbs or a control intervention (CON), in random order, and then performed a constant load rhythmic handgrip protocol until task failure. Rates of contraction and relaxation (Force/Time) were used as indices of fatigue. Brachial artery blood flow and conductance, besides forearm microvascular deoxygenation, were assessed during exercise. RIPC attenuated the slowing of contraction and relaxation throughout exercise (P<0.05 vs CON) and increased time to task failure by 11.2% (95% confidence interval: 0.7-21.7%, P<0.05 vs CON). There was no significant difference in blood flow, conductance, and deoxygenation between conditions throughout exercise (P>0.05). in conclusion, RIPC applied to the lower limbs delayed the development of fatigue during handgrip exercise, prolonged time to task failure, but was not accompanied by changes in forearm hemodynamics and deoxygenation.
Assunto Performance
ischemia
blood flow
vascular conductance
deoxyhemoglobin
Idioma Inglês
Financiador Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)
Fundação de Amparo à Pesquisa do Estado do Rio de Janeiro (FAPERJ)
Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)
Brazilian Funding Agency for Studies and Projects (FINEP)
Data 2015-06-01
Publicado em Scandinavian Journal of Medicine & Science in Sports. Hoboken: Wiley-Blackwell, v. 25, n. 3, p. 356-364, 2015.
ISSN 0905-7188 (Sherpa/Romeo, fator de impacto)
Editor Wiley-Blackwell
Extensão 356-364
Fonte http://dx.doi.org/10.1111/sms.12229
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:000354568800019
URI http://repositorio.unifesp.br/handle/11600/39139

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