Apr 1, 2020

The influence of training-induced sarcomerogenesis on the history dependence of force

BioRxiv : the Preprint Server for Biology
Kok Gan ChanGeoffrey A Power

Abstract

The increase or decrease in isometric force following active muscle lengthening or shortening, relative to a reference isometric contraction at the same muscle length and level of activation, are referred to as residual force enhancement (rFE) and residual force depression (rFD), respectively. The purpose of these experiments was to gain further mechanistic insight into the trainability of rFE and rFD, on the basis of serial sarcomere number (SSN) alterations to length-dependent properties. Maximal rFE/rFD measures from the soleus and extensor digitorum longus (EDL) of rats were compared after 4 weeks of uphill/downhill running and a no running control. Serial sarcomere numbers adapted to the training: soleus serial sarcomere number was greater with downhill compared to uphill running, while EDL demonstrated a trend towards more serial sarcomeres for downhill compared to no running. In contrast, absolute and normalized rFE/rFD did not differ across training groups for either muscle. As such, it appears that training-induced SSN adaptations do not modify rFE/rFD at the whole-muscle level.

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Mentioned in this Paper

Metabolic Process, Cellular
Classification
Genes
Metagenome
Archaea
Massively-Parallel Sequencing
Microbial
Virulence Factors
Small Molecule Libraries
HELT gene

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