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This study describes fiber-type characteristics (size, proportions, and oxidative enzyme activity) in two typical hindlimb muscles with opposite structure and function in an animal model of genetic obesity. Lesser fiber diameter, fiber-type composition, and histochemical succinic dehydrogenase activity (an oxidative marker) of muscle fiber types were assessed in slow (soleus)- and fast (tibialis cranialis)-twitch muscles of obese Zucker rats and compared with age (16 wk)- and sex (females)-matched lean Zucker rats ( n = 16\/group). Muscle mass and lesser fiber diameter were lower in both muscle types of obese compared with lean animals even though body weights were increased in the obese cohort. A faster fiber-type phenotype also occurred in slow- and fast-twitch muscles of obese rats compared with lean rats. These adaptations were accompanied by a significant increment in histochemical succinic dehydrogenase activity of slow-twitch fibers in the soleus muscle and fast-twitch fiber types in the tibialis cranialis muscle. Obesity significantly increased plasma levels of proinflammatory cytokines but did not significantly affect protein levels of peroxisome proliferator-activated receptors PPAR\u03b3 or PGC1\u03b1 in either muscle. These data demonstrate that, in female Zucker rats, obesity induces a reduction of muscle mass in which skeletal muscles show a diminished fiber size and a faster and more oxidative phenotype. It was noteworthy that this discrepancy in muscle's contractile and metabolic features was of comparable nature and extent in muscles with different fiber-type composition and antagonist functions. <\/jats:p><jats:p> NEW &amp; NOTEWORTHY This study demonstrates a discrepancy between morphological (reduced muscle mass), contractile (shift toward a faster phenotype), and metabolic (increased mitochondrial oxidative enzyme activity) characteristics in skeletal muscles of female Zucker fatty rats. It is noteworthy that this inconsistency was comparable (in nature and extent) in muscles with different structure and function. <\/jats:p>","DOI":"10.1152\/japplphysiol.00282.2017","type":"journal-article","created":{"date-parts":[[2017,5,18]],"date-time":"2017-05-18T20:10:26Z","timestamp":1495138226000},"page":"249-259","source":"Crossref","is-referenced-by-count":15,"title":["Obesity-induced discrepancy between contractile and metabolic phenotypes in slow- and fast-twitch skeletal muscles of female obese Zucker rats"],"prefix":"10.1152","volume":"123","author":[{"given":"Luz M.","family":"Acevedo","sequence":"first","affiliation":[{"name":"Laboratorio de Biopatolog\u00eda Muscular, Departamento de Anatom\u00eda y Anatom\u00eda Patol\u00f3gica Comparadas, Universidad de C\u00f3rdoba, C\u00f3rdoba, Spain;"},{"name":"Departamento de Ciencias Biom\u00e9dicas, Universidad Central de Venezuela, Maracay, Venezuela"}],"role":[{"role":"author","vocabulary":"crossref"}]},{"given":"Ana 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