Effects of short-term exercise on adiponectin and adiponectin receptor levels in rats

Abstract

Aim: Adiponectin reportedly reduces insulin resistance. Exercise has also been shown to lessen insulin resistance, although it is not wen known whether exercise increases levels of adiponectin and/or its receptors nor whether it effects are dependent on exercise intensity and/ or period. We previously reported that blood adiponectin levels increased by 150% in animals that exercised at a rate of 30 m/min for 60 minutes, 2 days per week, and adiponectin receptor 1 (AdipoR1) mRNA levels in muscle increased up to 4 times in response to exercise at a rate of 25 m/min for 30 min, 5 days per week for 12 weeks. Methods: In light of this information, we examined the effects of short-term exercise on adiponcctin, and adiponectin receptor levels in rats, using ELISA and real-time PCR. Results: Our data showed that adiponectin mRNA levels in adipose tissue increased by 280% in rats exercised at a rate of 30 m/min for 60 minutes for 2 weeks and correlated with the exercise time periods. No effects of short-term exercise on adiponectin receptor 1 mRNA in muscle were observed. Conclusion: Thus, long-term exercise may be required to regulate adiponectin receptor 1 mRNA expression in muscle and adiponectin mRNA expression in adipose tissue.