Hindlimb muscle fibre size and glycogen stores in bank voles with increased aerobic exercise metabolism.
J Exp Biol
; 219(Pt 4): 470-3, 2016 Feb.
Article
em En
| MEDLINE
| ID: mdl-26685167
ABSTRACT
To test hypotheses concerning physiological factors limiting the rate of aerobic exercise metabolism, we used a unique experimental evolution model lines of bank voles selected for high swim-induced aerobic metabolism (A) and unselected, control lines (C). We investigated putative adaptations that result in the increased performance of the hindlimb muscle (gastrocnemius joined with plantaris). The body mass-adjusted muscle mass was higher in A-lines (0.093 g) than in C-lines (0.083 g; P=0.01). However, selection did not affect mean muscle fibre cross-sectional area (P=0.34) or glycogen content assessed with a histochemical periodic acid-Schiff reaction (PAS; P=0.82). The results suggest that the increased aerobic performance is achieved by an increase of total muscle mass, without major qualitative changes in the muscle fibre architecture. However, such a conclusion should be treated with caution, because other modifications, such as increased density of capillaries or mitochondria, could occur.
Palavras-chave
Texto completo:
1
Bases de dados:
MEDLINE
Assunto principal:
Condicionamento Físico Animal
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Arvicolinae
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Músculo Esquelético
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Fibras Musculares Esqueléticas
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Metabolismo Energético
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Glicogênio
Tipo de estudo:
Prognostic_studies
/
Qualitative_research
Limite:
Animals
Idioma:
En
Revista:
J Exp Biol
Ano de publicação:
2016
Tipo de documento:
Article
País de afiliação:
Polônia