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Neuromechanical characterization of the abductor hallucis and its potential role in upright postural control.
Sharma, Tushar; Copeland, Paige V; Debenham, Mathew I B; Bent, Leah R; Dalton, Brian H.
Afiliación
  • Sharma T; Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada.
  • Copeland PV; School of Health and Exercise Sciences, University of British Columbia-Okanagan, Kelowna, BC, Canada.
  • Debenham MIB; School of Health and Exercise Sciences, University of British Columbia-Okanagan, Kelowna, BC, Canada.
  • Bent LR; Department of Human Health and Nutritional Sciences, University of Guelph, Guelph, ON, Canada.
  • Dalton BH; School of Health and Exercise Sciences, University of British Columbia-Okanagan, Kelowna, BC, Canada.
Appl Physiol Nutr Metab ; 49(3): 293-305, 2024 Mar 01.
Article en En | MEDLINE | ID: mdl-37913527
There is growing evidence to support a role for the abductor hallucis (AH) in standing balance control; however, functional properties of the muscle that may provide more insight into AH's specific contribution to upright posture have yet to be characterized. This study was conducted to quantify functional neuromechanical properties of the AH and correlate the measures with standing balance variables. We quantified strength and voluntary activation during maximal voluntary isometric contractions of the great toe abductor in nine (3 females and 6 males) healthy, young participants. During electrically evoked twitch and tetanic contractions, we measured great toe abduction peak force and constructed a force-frequency curve. We also evaluated peak abduction force, contraction time (CT), half-relaxation time (HRT), rate of force development (RFD), and relaxation rate (RR) from twitch contractions evoked using doublet stimuli. Strength, VA, CT, HRT, RFD, and RR were correlated to centre of pressure standard deviation (COP SD) and velocity (COP VEL) variables of the traditional COP trace and its rambling and trembling components during single-legged stance. AH twitch properties (e.g., CT: 169.8 ± 32.3 ms; HRT: 124.1 ± 29.2 ms) and force-frequency curve were similar to other slow contractile muscles. Contractile speed related negatively with COP VEL, suggesting AH may be appropriate for slow, prolonged tasks such as ongoing postural balance control. Correlation coefficient outcomes for all variables were similar between rambling and trembling components. Our results provide further evidence for the importance of AH neuromechanical function for standing balance control, at least during a challenging single-legged posture.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Músculo Esquelético / Pie Límite: Female / Humans / Male Idioma: En Revista: Appl Physiol Nutr Metab Asunto de la revista: CIENCIAS DA NUTRICAO / FISIOLOGIA / MEDICINA ESPORTIVA / METABOLISMO Año: 2024 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Canadá
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Músculo Esquelético / Pie Límite: Female / Humans / Male Idioma: En Revista: Appl Physiol Nutr Metab Asunto de la revista: CIENCIAS DA NUTRICAO / FISIOLOGIA / MEDICINA ESPORTIVA / METABOLISMO Año: 2024 Tipo del documento: Article País de afiliación: Canadá Pais de publicación: Canadá