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Charlotte Ling

Charlotte Ling

Professor

Charlotte Ling

A Single Nucleotide Polymorphism Associates With the Response of Muscle ATP Synthesis to Long-Term Exercise Training in Relatives of Type 2 Diabetic Humans

Author

  • Gertrud Kacerovsky-Bielesz
  • Michaela Kacerovsky
  • Marek Chmelik
  • Michaela Farukuoye
  • Charlotte Ling
  • Rochus Poican
  • Harald Tschan
  • Julia Szendroedi
  • Albrecht Ingo Schmid
  • Stephan Gruber
  • Christian Herder
  • Michael Wolzt
  • Ewald Moser
  • Giovanni Pacini
  • Gerhard Smekal
  • Leif Groop
  • Michael Roden

Summary, in English

OBJECTIVE-Myocellular ATP synthesis (fATP) associates with insulin sensitivity in first-degree relatives of subjects with type 2 diabetes. Short-term endurance training can modify their fATP and insulin sensitivity. This study examines the effects of moderate long-term exercise using endurance or resistance training in this cohort. RESEARCH DESIGN AND METHODS-A randomized, parallel-group trial tested 16 glucose-tolerant nonobese relatives (8 subjects in the endurance training group and 8 subjects in the resistance training group) before and after 26 weeks of endurance or resistance training. Exercise performance was assessed from power output and oxygen uptake (VO2) during incremental tests and from maximal torque of knee flexors (MaxT(flex)) and extensors (MaxT(ext)) using isokinetic dynamometry. fATP and ectopic lipids were measured with H-1/P-31 magnetic resonance spectroscopy. RESULTS Endurance training increased power output and VO2 by 44 and 30%, respectively (both P < 0.001), whereas resistance training increased MaxT(ext) and MaxT(flex) by 23 and 40%, respectively (both P < 0.001). Across all groups, insulin sensitivity (382 +/- 90 vs. 389 +/- 40 mL.min.m(-2)) and ectopic lipid contents were comparable after exercise training. However, 8 of 16 relatives had 26% greater fATP, increasing from 9.5 +/- 2.3 to 11.9 +/- 2.4 mu mol.mL(-1).m(-1) (P < 0.05). Six of eight responders were carriers of the G/G single nucleotide polymorphism rs540467 of the NDUFB6 gene (P = 0.019), which encodes a subunit of mitochondrial complex I. CONCLUSIONS-Moderate exercise training for 6 months does not necessarily improve insulin sensitivity but may increase ATP synthase flux. Genetic predisposition can modify the individual response of the ATP synthase flux independently of insulin sensitivity.

Department/s

  • EXODIAB: Excellence of Diabetes Research in Sweden
  • Genomics, Diabetes and Endocrinology

Publishing year

2012

Language

English

Pages

350-357

Publication/Series

Diabetes Care

Volume

35

Issue

2

Document type

Journal article

Publisher

American Diabetes Association

Topic

  • Endocrinology and Diabetes

Status

Published

Research group

  • Genomics, Diabetes and Endocrinology

ISBN/ISSN/Other

  • ISSN: 1935-5548