Function and position determine relative proportions of different fiber types in limb muscles of the lizard Tropidurus psammonastes

Pereira, Anieli Guirro; Abdala, Virginia; Kohlsdorf, Tiana

doi:10.1016/j.zool.2014.09.001

Cited by 5 publications

(6 citation statements)

References 51 publications

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“…However, as iliofibularis (used in previous studies) is a knee flexor and iliotibialis (used in the present study) is a knee extensor it is possible that such different functions could mean that scaling could have differential effects on their morphology and biochemistry, and it is likely that iliotibialis is a key muscle used in powering locomotion. Previous work has demonstrated that iliotibialis has a far higher proportion of fast glycolytic fibres than iliofibularis in the Brazilian sand lizard Tropidorus psammonastes (Pereira et al, 2015). A possible change to a higher proportion of fast glycolytic fibres in the larger lizard species in this study is partly supported by the decreased fatigue resistance with increased body size along with the increases in muscle stress and normalised power output.…”

Section: Discussionsupporting

confidence: 60%

Larger lacertid lizard species produce higher than expected iliotibialis muscle power output; the evolution of muscle contractile mechanics with body size in lacertid lizards

James

Vanhooydonck

Tallis

et al. 2015

Journal of Experimental Biology

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Increases in body size can lead to alterations in morphology, physiology, locomotor performance and behaviour of animals. Most studies considering the effects of scaling on muscle performance have studied within-species effects, with few studies considering differences between species. A previous review of published data indicates that maximum muscle-shortening velocity decreases, but that maximum isometric stress does not change, with increased body mass across species of terrestrial animals. However, such previous analyses do not account for the phylogenetic relatedness of the species studied. Our aim was to use phylogenetically informed analysis to determine the effects of body size on isolated iliotibialis muscle performance across 17 species of lacertid lizards. Between one and five individuals were used to obtain mean performance values for each species. We analysed the relationship between each variable and body size, as estimated by snout-vent length (SVL), whilst taking into account the phylogenetic relationships between species. We found that isometric tetanus relaxation time, maximal tetanus stress (force per muscle cross-sectional area) and maximal work loop power output (normalised to muscle mass) all significantly increased with greater SVL. In contrast, fatigue resistance during repeated work loops significantly decreased with SVL and there was no effect of size on tetanus activation time. When we compare our findings with those that would be predicted by dynamic similarity, then as these lacertid species become bigger, there is a greater than expected increase in the normalised muscle power output, probably to counter the larger than expected increase in body mass.

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Section: Discussionsupporting

confidence: 60%

Larger lacertid lizard species produce higher than expected iliotibialis muscle power output; the evolution of muscle contractile mechanics with body size in lacertid lizards

James

Vanhooydonck

Tallis

et al. 2015

Journal of Experimental Biology

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“…This could be driven by differences in fiber type concentrations or, alternatively, by differences in the respective sizes of different fiber types in these muscles. The m. ambiens in the lizard Tropidurus psammonastes, for instance, is composed of over 60% Type IIB fibers, approximately 30% Type IIA fibers and less than 10% Type I fibers (Pereira et al, 2015). Further, following either sprint or endurance training, specific muscle fiber types in the mixed fiber type muscle of A. carolinensis have been shown to increase in size to meet the demands of their training type (Husak et al, 2015).…”

Section: Discussionmentioning

confidence: 99%

The need for speed: functional specializations of locomotor and feeding muscles in Anolis lizards

Anderson

Roberts

2019

Journal of Experimental Biology

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Muscles often perform diverse mechanical roles within an organism. Tuning of contractile properties may therefore provide an opportunity for muscles to better perform their different roles and impact their associated whole-organism performance. Here, we examined the muscle contractile physiology of a jaw and a leg muscle in five Anolis species to determine whether consistent physiological differences are found in these muscles. We found that these jaw and leg muscles exhibited consistent patterns of variation across species, which may be related to the functional use of each muscle. In particular, we found that each muscle had differentially increased different measures of muscle speed. Although the jaw muscles had faster peak contractile velocities than the leg muscles, the leg muscles had faster twitch times and faster contractile velocities under intermediate loads. We also found that the jaw muscles exerted higher specific tensions and had a greater curvature to their force-velocity relationship. The consistent patterns across five species suggest that these jaw and leg muscles have specialized in different ways. Examination of these contractile property variations may help illuminate important features relating to performing their individual functional roles.

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“…The extension and flexion movements require of particular sets of muscles, such as the extensors femoris, whose tendon the proximal patella is always associated to. Interestingly, only small sesamoids, such as the fabella and cyamella, are associated to the ventral surface of the knee joint, although flexor muscles tend to be more complex and to perform more complex movements than the extensors (Pereira et al, ). The most evident difference between the extensor and flexor surface of the knee is that the convexity of the former generates an intense compression of the tendon of the extensor muscles over the epiphyses of the joint bones.…”

Section: Discussionmentioning

confidence: 99%

On the Presence of the Patella in Frogs

Abdala

Vera

Ponssa

2017

The Anatomical Record

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The patella is one of the most studied sesamoids. Historically, the patella is described as a big sesamoid embedded in the tendon of the quadriceps femoris muscle. This sesamoid is studied from developmental, functional, clinical, and anatomical perspectives. The presence of a patella is reported in squamatans, birds, and mammals. Lissamphibians are identified as the major lineage that fail to develop a patella. However, this sesamoid is reported at least once in anurans, but without detailed anatomical discussions. Through anatomical and histological studies we examined the topography and tissue composition of two structures that we identify as the proximal and distal patellae in several anuran species. We explored the evolution of these sesamoids through ancestral state reconstruction, finding that they are ancestral for amphibians and possibly tetrapods as a whole. The presence of these patellae in anurans would roll back their origin to the last common ancestor of tetrapods. From a functional perspective, the overwhelming evidence of fibrocartilage as a clear response to compression suggests that the fibrocartilaginous patellae could also withstand the mechanical stress generated on the knee undergoing compression during limb extension. Anat Rec, 2017. © 2017 Wiley Periodicals, Inc. Anat Rec, 300:1747-1755, 2017. © 2017 Wiley Periodicals, Inc.

show abstract

Function and position determine relative proportions of different fiber types in limb muscles of the lizard Tropidurus psammonastes

Cited by 5 publications

References 51 publications

Larger lacertid lizard species produce higher than expected iliotibialis muscle power output; the evolution of muscle contractile mechanics with body size in lacertid lizards

Larger lacertid lizard species produce higher than expected iliotibialis muscle power output; the evolution of muscle contractile mechanics with body size in lacertid lizards

The need for speed: functional specializations of locomotor and feeding muscles in Anolis lizards

On the Presence of the Patella in Frogs

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