... dynamic conditions remain unclear. To explore this, we investigated the effects of muscle stiffness, activation and length perturbations on muscle force. First, submaximal isometric contraction was established for whole soleus muscles. Next, the muscles were actively shortened at three velocities. During...

... © 2022. Published by The Company of Biologists Ltd 2022 Summary: Eccentric force is relatively preserved compared with isometric force when cross-bridge cycling is inhibited, possibly because of the contribution of the elastic force produced by titin. Soleus Skinned fiber Titin...

... deletion in N2A titin, has been proposed to prevent N2A titin–actin interactions so that active mdm muscles are more compliant than wild type (WT). This decrease in active muscle stiffness is associated with reduced RFE. We investigated RFE in permeabilized soleus (SOL) and extensor digitorum longus (EDL...

... of protein ensembles with different isoform profiles at the sarcomere scale. However, it remains unclear how isoform profiles shape whole-muscle performance. We compared two mouse hindlimb muscles, the slow, relatively parallel-fibered soleus and the faster, more pennate-fibered tibialis anterior (TA...

..., and whether the effects are muscle specific and aggravated in older age. Muscle morphology was determined in the soleus, extensor digitorum longus (EDL) and diaphragm muscles of female CD-1 mice from 5 groups: young fed a HFD for 8 weeks (YS-HFD, n =16), young fed a HFD for 16 weeks (YL-HFD, n =28) and young...

... between midfoot/forefoot and rearfoot strikers. Dynamic optimization Forefoot strike Gastrocnemius medialis Rearfoot strike Soleus Ultrasound The metabolic energy consumed during submaximal running, often referred to as running economy, is an important factor determining endurance...

... for this force potentiation. However, direct examination of the influence of tendon elongation on the SSC effect has not been made. The aim of this study was to evaluate the contribution of tendon elongation to the SSC effect by comparing the magnitude of the SSC effect in the rat soleus with and without...

.... Therefore, the purpose of this study was to examine the effect of stretch magnitude, and by association RFE, on the mechanics of the stretch–shortening cycle (SSC) in skinned skeletal muscle fibres. Three tests were performed using skinned rabbit soleus fibres ( N =18). The first test was a pure shortening...

..., on the magnitude and direction of the 3D ankle moment exerted by the soleus muscle and the mechanical interaction between ankle plantar flexor muscles during co-activation of gastrocnemius muscle, in the rat ( N =9). Ankle angle was kept constant (90 deg), whereas knee angle was varied between 60 deg and 130 deg...

...) and several biochemical properties that may affect performance. There was no significant difference in soleus muscle power output–cycle frequency curves between winter (torpid) and summer (active) animals. Total antioxidant capacity of gastrocnemius muscle was 156% higher in torpid than in summer animals...

... the relative contributions of lower and higher frequency signals of cat ankle extensors (soleus, medial and lateral gastrocnemii, plantaris) during level, downslope and upslope walking and the paw-shake response. This was done using the first two myoelectric signal principal components (PCI, PCII), explaining...

... on normalized length operating ranges of muscle during human gait, or how they are modulated when mechanical demands (such as force output) change. Here we explored the soleus muscle (SOL) operating lengths experimentally in a group of healthy young adults by combining subject-specific F–L relationships...

...Cyril Bozzo; Laurence Stevens; Valentine Bouet; Valérie Montel; Florence Picquet; Maurice Falempin; Michel Lacour; Yvonne Mounier SUMMARY This study examined the effects of an elevation of the gravity factor(hypergravity – 2 g ) on the molecular and functional characteristics of rat soleus...

...Klaus D. Jürgens SUMMARY The skeletal muscles of the smallest mammal, the Etruscan shrew Suncus etruscus , are functionally and structurally adapted to the requirements of an enormously high energy turnover. Isometric twitch contractions of the extensor digitorum longus (EDL) and soleus muscles...

...Thomas Peters; Hans Peter Kubis; Petra Wetzel; Susanne Sender; Gerhard Asmussen; Roger Fons; Klaus D. Jürgens ABSTRACT In the Etruscan shrew, the isometric twitch contraction times of extensor digitorum longus (EDL) and soleus muscles are shorter than in any other mammal, allowing these muscles...

...Da-Xing Lu; Lorenzo Käser; Markus Müntener ABSTRACT The extensor digitorum longus muscle (EDL) or soleus muscle (SOL) in rats was mechanically overloaded on one side. The muscles were (i) untreated (normal) or (ii) self- or foreign-reinnervated (leading to persisting muscle fibres) or transplanted...