Articles : Effect on Release of Nitric Oxide and the Concentration of Lactate by Difference Exercise Type

Journal of Exercise Nutrition & Biochemistry 2003;7(3):291-296.

Abstract

The purpose of this study was to investigate the of effects of different types of cycle exercise on blood NO (nitrie oxide) and LA (lactate) concentrations in trained subjects. Seven male university volleyball players participated in this study. All the subjects performed three different exercise test (Graded (G). Aerobic (A), and anaerobic (AN)) on a cycle ergometer with one week of washout period among the tests. V02max was determined on a Monark bicycle ergometer using the A strand protocol, which was also used at the G exercise test. The A exercise rest was performed the bicycle ergometer at an intensity of 60% of the VO_(2max). The AN exercise test was composed of a 30_(s) Wingate cycling test. Venous blood samples (3 ml each) were coilected from an antecubital vein into EDTA-treated tubes befor, during, immediately after and 30minutes after the test for the determination of blood NO and LA concentrations The results of the study were as follows: 1) In the G exercise test, baseline N0 and LA concentrations were significantly elevated during. immediately after and 30 minutes after test. There was an inverse relationship between the NO and LA concentrations. 2) In the A exercise test, there were no significant changes in plasma NO concentration throughout the test, while baseline LA concentrations increased significantly during, immediately after and 30 minutes after the test. 3) In the AN exercise LA, concentrations were significantly elevated during, immediately after and 30 minutes after the test. In summary, there were dose-responses in NO and LA elevations following acute exercise, such that the higher exercise intensity the greater elevation in the NO and LA concentrations, In addition, we found that there was an inverse relationship in plasma NO and LA concentrations.

Key Words: nitric oxide, lactate, exercise type