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No effect of coactivation on fatigue-induced decreases in isokinetic and isometric torque in healthy young male adults.
Neltner, Tyler J; Smith, Robert W; Arnett, Jocelyn E; Anders, John Paul V; Keller, Joshua L; Housh, Terry J; Schmidt, Richard J; Johnson, Glen O.
Afiliación
  • Neltner TJ; Department of Nutrition and Health Sciences, University of Nebraska- Lincoln, Lincoln, NE 68510, USA. Electronic address: tneltner2@huskers.unl.edu.
  • Smith RW; Department of Nutrition and Health Sciences, University of Nebraska- Lincoln, Lincoln, NE 68510, USA.
  • Arnett JE; Department of Nutrition and Health Sciences, University of Nebraska- Lincoln, Lincoln, NE 68510, USA.
  • Anders JPV; Department of Human Sciences, Ohio State University, Columbus, OH 43017, USA.
  • Keller JL; Department of Health, Kinesiology and Sport, University of South Alabama, Mobile, AL 36688, USA.
  • Housh TJ; Department of Nutrition and Health Sciences, University of Nebraska- Lincoln, Lincoln, NE 68510, USA.
  • Schmidt RJ; Department of Nutrition and Health Sciences, University of Nebraska- Lincoln, Lincoln, NE 68510, USA.
  • Johnson GO; Department of Nutrition and Health Sciences, University of Nebraska- Lincoln, Lincoln, NE 68510, USA.
Hum Mov Sci ; 86: 103002, 2022 Dec.
Article en En | MEDLINE | ID: mdl-36162383
BACKGROUND: Antagonist activation may contribute to fatigue-induced decreases in torque while assisting in the maintenance of joint stability. This study utilized a reciprocal, slow velocity (60°·s-1) forearm flexion and extension fatiguing task to examine the contributions of coactivation to torque production at slow and moderate (180°·s-1) velocities, as well as during a maximal voluntary isometric contraction (MVIC). METHODS: Twelve recreationally active men (mean ± SD: age = 21.7 ± 1.6 years; body mass = 83.5 ± 8.8 kg; height = 179.4 ± 5.2 cm) completed isokinetic (60 and 180°·s-1) and isometric pre-testing of forearm flexion and extension, followed by 50 maximal, reciprocal, isokinetic muscle actions at 60°·s-1, followed by post-testing. The amplitude (AMP) of the electromyographic (EMG) signals from the biceps and triceps brachii were simultaneously recorded. Torque and EMG AMP were normalized to the corresponding values from the pre-testing peak torque movements. Repeated measures ANOVAs and pairwise comparisons were used to identify mean changes in torque, EMG AMP, and coactivation ratios. RESULTS: The torque analyses indicated greater (p < 0.03) decreases for 180°·s-1 (24%) and MVIC (23%) than 60°·s-1 (14%) for forearm flexion. For forearm extension, there were no differences (p > 0.05) in fatigability between velocities. For EMG AMP there were no changes (p > 0.05) from pre- to post-testing for any velocity or movement. There were no changes (p > 0.05) in the coactivation ratio for forearm flexion, but significant increases (13.6 ± 6.6 to 16.9 ± 6.0; p = 0.003) for forearm extension, collapsed across Velocity. CONCLUSIONS: There was velocity- and movement-specific fatigability for forearm flexion and extension. The parallel, fatigue-induced EMG AMP responses indicated that coactivation did not contribute to the decreases in torque and would not affect elbow joint stability.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Fatiga Muscular / Contracción Isométrica Límite: Adult / Humans / Male Idioma: En Revista: Hum Mov Sci Año: 2022 Tipo del documento: Article Pais de publicación: Países Bajos
Texto completo
Añadir a Mi BVS
Imprimir
XML
PubMed Links
Buscar en Google

Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Fatiga Muscular / Contracción Isométrica Límite: Adult / Humans / Male Idioma: En Revista: Hum Mov Sci Año: 2022 Tipo del documento: Article Pais de publicación: Países Bajos