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The effects of muscle starting length on work loop power output of isolated mouse soleus and extensor digitorum longus muscle.
Shelley, Sharn P; James, Rob S; Tallis, Jason.
Afiliação
  • Shelley SP; Research Centre for Physical Activity, Sport and Exercise Science, Coventry University, Coventry, CV1 5FB, UK.
  • James RS; Faculty of Life Sciences, University of Bradford, Bradford, BD7 1DP, UK.
  • Tallis J; Research Centre for Physical Activity, Sport and Exercise Science, Coventry University, Coventry, CV1 5FB, UK.
J Exp Biol ; 227(8)2024 Apr 15.
Article em En | MEDLINE | ID: mdl-38584504
ABSTRACT
Force-length relationships derived from isometric activations may not directly apply to muscle force production during dynamic contractions. As such, different muscle starting lengths between isometric and dynamic conditions could be required to achieve maximal force and power. Therefore, this study examined the effects of starting length [±5-10% of length corresponding to maximal twitch force (L0)] on work loop (WL) power output (PO), across a range of cycle frequencies, of the soleus (SOL) and extensor digitorum longus muscle (EDL; N=8-10) isolated from ∼8 week old C57 mice. Furthermore, passive work was examined at a fixed cycle frequency to determine the association of passive work and active net work. Starting length affected maximal WL PO of the SOL and EDL across evaluated cycle frequencies (P<0.030, ηp2>0.494). For the SOL, PO produced at -5% L0 was greater than that at most starting lengths (P<0.015, Cohen's d>0.6), except -10% L0 (P=0.135, d<0.4). However, PO produced at -10% L0 versus L0 did not differ (P=0.138, d=0.35-0.49), indicating -5% L0 is optimal for maximal SOL WL PO. For the EDL, WL PO produced at -10% L0 was lower than that at most starting lengths (P<0.032, d>1.08), except versus -5% L0 (P=0.124, d<0.97). PO produced at other starting lengths did not differ (P>0.163, d<1.04). For the SOL, higher passive work was associated with reduced PO (Spearman's r=0.709, P<0.001), but no relationship was observed between passive work and PO of the EDL (Pearson's r=0.191, r2=0.04, P=0.184). This study suggests that starting length should be optimised for both static and dynamic contractions and confirms that the force-length curve during dynamic contractions is muscle specific.
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Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Músculo Esquelético / Camundongos Endogâmicos C57BL / Contração Muscular Limite: Animals Idioma: En Revista: J Exp Biol Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Reino Unido

Texto completo: 1 Coleções: 01-internacional Base de dados: MEDLINE Assunto principal: Músculo Esquelético / Camundongos Endogâmicos C57BL / Contração Muscular Limite: Animals Idioma: En Revista: J Exp Biol Ano de publicação: 2024 Tipo de documento: Article País de afiliação: Reino Unido