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Does muscle growth mediate changes in a nonspecific strength task?
Spitz, Robert W; Dankel, Scott J; Jessee, Matthew B; Wong, Vickie; Bell, Zachary W; Abe, Takashi; Loenneke, Jeremy P.
Afiliación
  • Spitz RW; Department of Health, Exercise Science, and Recreation Management, Kevser Ermin Applied Physiology Laboratory, The University of Mississippi, University Park, Mississippi, USA.
  • Dankel SJ; Department of Health and Exercise Science, Exercise Physiology Laboratory, Rowan University, Glassboro, New Jersey, USA.
  • Jessee MB; Department of Health, Exercise Science, and Recreation Management, Applied Human Health and Physical Function Laboratory, The University of Mississippi, University Park, Mississippi, USA.
  • Wong V; Department of Health, Exercise Science, and Recreation Management, Kevser Ermin Applied Physiology Laboratory, The University of Mississippi, University Park, Mississippi, USA.
  • Bell ZW; Department of Health, Exercise Science, and Recreation Management, Kevser Ermin Applied Physiology Laboratory, The University of Mississippi, University Park, Mississippi, USA.
  • Abe T; Graduate School of Health and Sports Science & Institute of Health and Sports Science and Medicine, Juntendo University, Inzai, Chiba, Japan.
  • Loenneke JP; Department of Health, Exercise Science, and Recreation Management, Kevser Ermin Applied Physiology Laboratory, The University of Mississippi, University Park, Mississippi, USA.
Clin Physiol Funct Imaging ; 43(4): 223-231, 2023 Jul.
Article en En | MEDLINE | ID: mdl-36647320
The purpose of this study was to determine if muscle growth mediates increases in a strength task which was not directly trained. One hundred fifty-one participants were randomized into control, one-repetition maximum training (1RM-TRAIN), or traditional training (TRAD-TRAIN). Training groups performed isotonic elbow flexion 3x/week for 6 weeks. Anterior muscle thickness at 50%, 60% and 70% upper arm length, and maximal isokinetic torque at 60°/sec were assessed pre- and post-training. Change-score mediation models (adjusted for sex, pre-muscle thickness, and pre-strength) were constructed for each muscle thickness site. The effects of each training group were evaluated relative to the control. Data is presented as coefficient (95% CI). There were no significant relative direct effects on nonspecific strength for either training group outside of the 60% model (1.7 [0.13, 3.27] Nm). The relative effect of 1RM-TRAIN on muscle thickness was greater in 60% (0.09 [0.01, 0.17] cm) and 70% (0.09 [0.00, 0.17] cm) models; while TRAD-TRAIN was greater in all three: (50% = 0.24 [0.15, 0.32]; 60% = 0.24 [0.16, 0.33]; 70% = 0.22 [0.14, 0.31] cm). The effect of muscle thickness on nonspecific strength was only significant for the 60% (-3.06 [-5.7, -0.35] Nm) model. The relative indirect effect on nonspecific strength was not significant for the 1RM-TRAIN or TRAD-TRAIN. Similar to previous findings on specific strength, we did not find evidence for a mediating effect of muscle growth on training induced increases in nonspecific strength. The importance of muscle growth for changes in nonspecifically trained strength may need to be reconsidered.
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Músculo Esquelético / Entrenamiento de Fuerza Tipo de estudio: Clinical_trials / Prognostic_studies Límite: Humans Idioma: En Revista: Clin Physiol Funct Imaging Asunto de la revista: FISIOLOGIA / PATOLOGIA Año: 2023 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido
Texto completo
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Texto completo: 1 Colección: 01-internacional Base de datos: MEDLINE Asunto principal: Músculo Esquelético / Entrenamiento de Fuerza Tipo de estudio: Clinical_trials / Prognostic_studies Límite: Humans Idioma: En Revista: Clin Physiol Funct Imaging Asunto de la revista: FISIOLOGIA / PATOLOGIA Año: 2023 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Reino Unido