Use este identificador para citar ou linkar para este item: http://repositorio.bc.ufg.br/handle/ri/16647
Tipo do documento: Artigo
Título: The influence of acute hypoxic exposure on isokinetic muscle force production
Autor: Ivamoto, Rafael Kenji
Nakamoto, Fernanda Patti
Vancini, Rodrigo Luiz
Silva, Ana Amélia Benedito
Lira, Claudio Andre Barbosa de
Andrade, Marília dos Santos
Abstract: To investigated whether an acute hypoxic stimulus affects muscle strength development assessed by isokinetic dynamometry during maximal knee extension. A total of 15 healthy young men participated in this study (61.9 ± 6.1 kg; 1.72 ± 0.08 m; 20.9 ± 2.6 years). We evaluated knee extension and flexion isokinetic dynamometer performance in normoxic and hypoxic conditions. The analyzed parameters, for concentric contraction, were peak torque and total work measured at 1.05 and 5.23 rad/s; and fatigue index measured at 5.23 rad/s. During isokinetic testing, heart rate and oxygen saturation (SpO 2 ) were monitored. Hypoxic conditions (3,600 m) were simulated, via a mixing chamber, with the dilution being constantly controlled by a PO 2 probe. Test reproducibility results (test-retest) for all isokinetic knee parameters were classified as moderate to almost perfect (ICC = 0.694 to 0.932). SpO 2 was 88.4 ± 3.4% in the hypoxic condition and 97.1 ± 0.7% in the normoxic condition (p = 0.000, effect size = 0.87). Heart rate was not significantly different between normoxic and hypoxic conditions at the end of the test. There were no significant differences in isokinetic variables evaluated for the extensor and flexor muscles at concentric contraction between the normoxic and hypoxic conditions. Our findings indicate that reduced arterial oxygenation per se has no effect on the muscular isokinetic strength of the knee extensors.
Palavras-chave: Normoxia
Oxygen saturation
Isokinetic dynamometry
Knee muscle strength
País: Gra-bretanha
Unidade acadêmica: Faculdade de Educação Física e Dança - FEFD (RG)
Citação: IVAMOTO, Rafael Kenji et al. The influence of acute hypoxic exposure on isokinetic muscle force production. SpringerPlus, London, v. 3, n. 604, p. 1-5, 2014.
Tipo de acesso: Acesso Aberto
URI: http://repositorio.bc.ufg.br/handle/ri/16647
Data de publicação: 2014
Aparece nas coleções:FM - Artigos publicados em periódicos

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