Skip Navigation LinksHome > July 2007 - Volume 39 - Issue 7 > Decreased Blood Oxidative Stress after Repeated Muscle-Damag...
Medicine & Science in Sports & Exercise:
doi: 10.1249/mss.0b013e31804ca10c
BASIC SCIENCES: Original Investigations

Decreased Blood Oxidative Stress after Repeated Muscle-Damaging Exercise

NIKOLAIDIS, MICHALIS G.1,2,3; PASCHALIS, VASSILIS2,3; GIAKAS, GIANNIS2,3; FATOUROS, IOANNIS G.4; KOUTEDAKIS, YIANNIS2,3; KOURETAS, DIMITRIS1,3; JAMURTAS, ATHANASIOS Z.2,3

Collapse Box

Abstract

Purpose: To examine the effect of repeated muscle-damaging exercise on the time-course changes in several indices of muscle damage, and to compare them with changes in blood oxidative stress indices.

Methods: Twelve females underwent an isokinetic exercise session consisting of 75 lengthening knee flexions, which was repeated after 3 wk. Isometric torque, range of movement (ROM), delayed-onset muscle soreness (DOMS), creatine kinase (CK), reduced glutathione (GSH), oxidized glutathione (GSSG), thiobarbituric acid-reactive substances (TBARS), protein carbonyls, catalase, uric acid, bilirubin, and total antioxidant capacity (TAC) in blood were measured before, immediately after, and 1, 2, 3, 4, and 7 d after lengthening contractions.

Results: All muscle damage indices (torque, ROM, DOMS, and CK) changed significantly after exercise. The concentration of all oxidative stress indices changed significantly in a way indicating increased oxidative stress in the blood (GSH and GSH/GSSG decreased, whereas GSSG, TBARS, protein carbonyls, catalase, uric acid, bilirubin, and TAC increased), peaking in all but bilirubin at 3 d and returning to baseline values by 7 d after exercise. The repeated bout of lengthening contractions induced significantly less changes in indices of muscle damage and blood oxidative stress than the first bout. In general, from the increasing or decreasing area under the curve calculated for each oxidative stress index, the second bout produced 1.8- to 6.1-fold less changes in oxidative stress than after the first bout.

Conclusion: A repeated bout of lengthening contractions attenuated muscle damage and blood oxidative stress compared with the first bout.

©2007The American College of Sports Medicine

Login

Article Tools

Share

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