Skip Navigation LinksHome > November 2014 - Volume 46 - Issue 11 > Exercise-Induced Lowering of Fetuin-A May Increase Hepatic I...
Medicine & Science in Sports & Exercise:
doi: 10.1249/MSS.0000000000000338
Basic Sciences

Exercise-Induced Lowering of Fetuin-A May Increase Hepatic Insulin Sensitivity

Malin, Steven K.1,2; del Rincon, Juan Pablo1; Huang, Hazel1; Kirwan, John P.1,2,3

Collapse Box


Introduction: Fetuin-A is a novel hepatokine, and there is preliminary evidence that it may contribute to the pathogenesis of type 2 diabetes. Exercise reduces fetuin-A, but the specific metabolic effects particularly as they relate to the regulation of insulin resistance are unknown. This led us to examine the effect of exercise training on circulating fetuin-A in relation to skeletal muscle and/or hepatic insulin resistance in obese adults.

Methods: Twenty older adults (66.3 ± 0.9 yr; body mass index, 34.1 ± 1.2 kg·m−2) participated in this prospective 12-wk study and underwent supervised exercise training (5 d·wk−1, 60 min·d−1 at approximately 85% HRmax). Insulin resistance was assessed using the euglycemic–hyperinsulinemic clamp (40 mU·m−2·min−1) with isotope dilution ([6,6-2H2]-glucose). Skeletal muscle insulin sensitivity (rate of glucose disposal), hepatic insulin resistance (rate of glucose appearance × fasting insulin), metabolic flexibility (respiratory quotientclamp − respiratory quotientfasting), fetuin-A, high-molecular weight adiponectin, high-sensitivity C-reactive protein, leptin, and body fat (dual energy x-ray absorptiometry) were measured before and after the intervention.

Results: Exercise reduced body fat, high-sensitivity C-reactive protein, leptin and hepatic as well as skeletal muscle insulin resistance (each, P < 0.05). Fetuin-A was decreased by approximately 8% (pre, 1.01 ± 0.08, vs post, 0.89 ± 0.06 g·L−1; P < 0.05) after the intervention, and lower fetuin-A after exercise correlated with lower hepatic insulin resistance (r = −0.46, P < 0.01), increased metabolic flexibility (r = −0.70, P < 0.01) and high-molecular weight adiponectin (r = −0.57, P < 0.01).

Conclusions: Fetuin-A may contribute to exercise training-induced improvements in hepatic insulin resistance, CHO utilization, and inflammation in older obese adults. Further work is required to determine the cellular mechanism(s) of action for fetuin-A because this hepatokine is related to type 2 diabetes risk.

© 2014 American College of Sports Medicine


Article Tools


Article Level Metrics

Search for Similar Articles
You may search for similar articles that contain these same keywords or you may modify the keyword list to augment your search.

Connect With Us