Autor(es)

Dutra, Yago Medeiros ; Lopes, Joao Pedro Fialho ; Murias, Juan M. ; Zagatto, Alessandro Moura

• Tipo de documento: Artigo Científico
• Fonte: Journal of Applied Physiology; v. 135, n. 6, p. 12-pg., 2023-12-02.

Resumo

The study evaluated the reliability and repeatability of the force and surface electromyography activity (EMG) outcomes obtained through voluntary and electrically evoked contractions of knee extensors in females (n = 18) and males (n = 20) and compared these data between sexes. Maximal isometric voluntary contractions (iMVCs) of knee extensors associated with electrical stimulation of the femoral nerve were performed over 4 days (48-h interval), with the first day involving familiarization procedures, the second involving three trials (1-h interval), and the third and fourth involving just one trial. The intraclass correlation coefficient (ICC), coefficient of variation (CV), and repeatability of outcomes from within- and between-day trials were determined for each sex. Females presented lower maximal voluntary force during iMVC (iMVC(Force)) and associated vastus lateralis EMG activity (root mean square, RMSVL), force evoked by potentiated doublet high-frequency (Db(100Force)) and single stimuli (Q(tw)), and M-wave amplitude than males (P <= 0.01, partial eta squared >= 0.94). Voluntary activation (VA) and RMSVL/M-wave amplitude did not differ between sexes. iMVC(Force), VA, Db(100Force), Q(tw), and M-wave amplitude were the most reliable outcomes in within-day trials, with similar results between sexes (ICC > 0.62; CV < 6.4%; repeatability: 12.2%-22.6%). When investigating between-day trials, the iMVC(Force), VA, Db(100Force), and Q(tw) were the most reliable (ICC > 0.66; CV < 7.5%; repeatability: 13.2%-33.45%) with similar results between sexes. In conclusion, females presented lower iMVC(Force) and evoked response than males. Although reliability and repeatability statistics vary between trials, data (e.g., from EMG or force signal), and sexes, most of the outcomes obtained through this technique are reliable in females and males. (AU)

• Processo FAPESP: 21/08479-0 - Time course da recuperação neuromuscular após sessão de treino de corrida: influência da intensidade, da imersão em água quente e da imersão em água fria
• Beneficiário: Yago Medeiros Dutra
• Modalidade de apoio: Bolsas no Brasil - Doutorado
• Processo FAPESP: 22/01173-5 - Curso temporal da fadiga neuromuscular após o exercício no calor: a variabilidade da frequência cardíaca e os marcadores sanguíneos são sensíveis a esta situação?
• Beneficiário: João Pedro Fialho Lopes
• Modalidade de apoio: Bolsas no Brasil - Iniciação Científica
• Processo FAPESP: 21/14156-9 - Influência do protocolo de exercício e "instabilidade" metabólica no componente lento do VO2 e ganho funcional do VO2 durante esforço em carga constante em intensidades correspondentes ao domínio pesado e severo no ciclismo
• Beneficiário: Alessandro Moura Zagatto
• Modalidade de apoio: Bolsas no Exterior - Pesquisa