Exercise intensity, inflammatory signaling, and insulin resistance in obese rats.

Abstract:

PURPOSE:To evaluate the effects of intensity of exercise on insulin resistance and the expression of inflammatory proteins in the skeletal muscle of diet-induced obese (DIO) rats after a single bout of exercise. METHODS:In the first exercise protocol, the rats swam for two 3-h bouts, separated by a 45-min rest period (with 6 h in duration--O + EXE), and in the second protocol, the rats were exercised with 45 min of swimming at 70% of the maximal lactate steady state--SS (DIO + MLSS). RESULTS:Our data demonstrated that both protocols of exercise increased insulin sensitivity and increased insulin-stimulated tyrosine phosphorylation of insulin receptor and insulin receptor substrate 1 and serine phosphorylation of protein kinase B in the muscle of DIO rats by the same magnitude. In parallel, both exercise protocols also reduced protein tyrosine phosphatase 1B activity and insulin receptor substrate 1 serine phosphorylation, with concomitant reduction in c-jun N-terminal kinase and IJB kinase activities in the muscle of DIO rats in a similar fashion. CONCLUSIONS:Thus, our data demonstrate that either exercise protocols with low intensity and high volume or exercise with moderate intensity and low volume represents different strategies to restore insulin sensitivity with the same efficacy.

journal_name

Med Sci Sports Exerc

authors

Da Silva AS,Pauli JR,Ropelle ER,Oliveira AG,Cintra DE,De Souza CT,Velloso LA,Carvalheira JB,Saad MJ

doi

10.1249/MSS.0b013e3181e45d08

subject

Has Abstract

pub_date

2010-12-01 00:00:00

pages

2180-8

issue

12

eissn

0195-9131

issn

1530-0315

journal_volume

42

pub_type

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