Effect of weight loss on muscle fiber type, fiber size, capillarity, and succinate dehydrogenase activity in humans

Philip A. Kern, Rosa B. Simsolo, Mario Fournier

Research output: Contribution to journalArticlepeer-review

73 Scopus citations

Abstract

To examine the effects of weight loss on muscle oxidative properties, nine obese subjects (body mass index, 34 ± 1.5) had muscle biopsies before and after weight loss and weight stabilization. Weight loss ranged from 13-32 kg and represented 20.8 ± 2.1% of initial weight. After weight loss, there was no change in the proportions of oxidative (type I and type IIa) fibers and also no change in mean fiber cross-sectional area, whereas there was a small, but significant, decrease in the relative interstitial space (P < 0.05). However, weight loss resulted in a 32 ± 6% (mean ± SEM) increase in capillary/fiber ratio and a 54% increase in capillary density (P < 0.05). In addition, there was a 41 ± 13% increase in succinate dehydrogenase (SDH) activity (P < 0.05). This increase in muscle capillarization and SDH activity was seen in all fiber types, even the relatively lower oxidative type IIx fibers. There was a strong correlation between the change in capillary/fiber ratio and the change in SDH activity (r = 0.82; P < 0.02). Thus, weight loss resulted in no change in muscle fiber type or cross-sectional area, but produced increases in capillary/fiber ratio, capillary density, and SDH activity, suggesting an increase in muscle oxidative capacity.

Original languageEnglish
Pages (from-to)4185-4190
Number of pages6
JournalJournal of Clinical Endocrinology and Metabolism
Volume84
Issue number11
DOIs
StatePublished - 1999

ASJC Scopus subject areas

  • Endocrinology, Diabetes and Metabolism
  • Biochemistry
  • Endocrinology
  • Clinical Biochemistry
  • Biochemistry, medical

Fingerprint

Dive into the research topics of 'Effect of weight loss on muscle fiber type, fiber size, capillarity, and succinate dehydrogenase activity in humans'. Together they form a unique fingerprint.

Cite this