title: Muscle and blood redox status after exercise training in severe COPD patients.
abstract: Beneficial effects of exercise training in patients with chronic obstructive pulmonary disease (COPD) are acknowledged. However, high-intensity exercise may enhance muscle oxidative stress in severe COPD patients. We hypothesized that high-intensity exercise training of long duration does not deteriorate muscle redox status. In the vastus lateralis and blood of 18 severe COPD patients and 12 controls, before and after an 8-week training program, protein oxidation and nitration, antioxidant systems, and inflammatory cytokines were examined. At baseline, COPD patients showed greater muscle oxidative stress and superoxide dismutase activity and circulating inflammatory cytokines than controls. Among COPD patients, muscle and blood protein carbonylation levels were correlated. Both groups showed training-induced increase in VO(2) peak and decreased blood lactate levels. After training, among the COPD patients, blood protein nitration levels were significantly reduced and muscle protein oxidation and nitration levels did not cause impairment. Muscle and blood levels of inflammatory cytokines were not modified by training in either patients or controls. We conclude that in severe COPD patients, high-intensity exercise training of long duration improves exercise capacity while preventing the enhancement of systemic and muscle oxidative stress. In addition, in these patients, resting protein oxidation levels correlate between skeletal muscle and blood compartments.
authors: Servei de Pneumologia, Hospital Clinic, IDIBAPS, Universitat de Barcelona, Barcelona, Catalonia, Spain.
authors: Diego A
authors: DA
authors: Rodriguez
authors: Susana
authors: S
authors: Kalko
authors: Ester
authors: E
authors: Puig-Vilanova
authors: Maitane
authors: M
authors: Perez-Olabarría
authors: Francesco
authors: F
authors: Falciani
authors: Joaquim
authors: J
authors: Gea
authors: Marta
authors: M
authors: Cascante
authors: Esther
authors: E
authors: Barreiro
authors: Josep
authors: J
authors: Roca
mesh_terms: D000368:Aged; D016022:Case-Control Studies; D002374:Catalase / Q000378:metabolism; D016207:Cytokines / Q000096:biosynthesis / Q000276:immunology; D015444:Exercise / Q000502:physiology*; D005260:Female; D005978:Glutathione / Q000097:blood; D006801:Humans; D007249:Inflammation / Q000150:complications / Q000276:immunology / Q000378:metabolism / Q000503:physiopathology; D019344:Lactic Acid / Q000097:blood; D008297:Male; D008875:Middle Aged; D018482:Muscle, Skeletal / Q000378:metabolism* / Q000503:physiopathology; D009566:Nitrates / Q000097:blood; D010084:Oxidation-Reduction; D018384:Oxidative Stress; D050050:Protein Carbonylation; D029424:Pulmonary Disease, Chronic Obstructive / Q000150:complications / Q000276:immunology / Q000378:metabolism* / Q000503:physiopathology; D012720:Severity of Illness Index; D013482:Superoxide Dismutase / Q000378:metabolism
chemical_list: D016207:Cytokines; D009566:Nitrates; D019344:Lactic Acid; D002374:Catalase; D013482:Superoxide Dismutase; D005978:Glutathione