Combined antioxidant treatment effects on blood oxidative stress after eccentric exercise.
OBJECTIVE
This study was designed to ascertain the effects of a combination antioxidant therapy on plasma protein carbonyls (PC), malondialdehyde (MDA), and whole blood total (TGSH), oxidized (GSSG), and reduced (GSH) glutathione in non-resistance trained females after eccentric resistance exercise.


METHODS
Eighteen women (aged 19-31 yr) were randomized in a double-blind manner to either an antioxidant supplement (N = 9; 400 IU vitamin E, 1 g vitamin C, and 90 mug selenium per day) or a lactose placebo (N = 9) for 14 d before and for 2 d after eccentric elbow flexor exercise. Blood samples taken before and immediately, 2, 6, 24, and 48 h postexercise were analyzed for PC, MDA, TGSH, and GSSG.


RESULTS
No treatment by time interaction was noted for any variable, with all blood markers experiencing a change after the exercise in both conditions. Time main effects were observed for PC, MDA, and GSSG, with values elevated above preexercise after the eccentric exercise, whereas GSH concentration decreased after the eccentric exercise. Antioxidant supplementation resulted in a condition main effect for PC and MDA, with lower values compared with placebo. The antioxidant treatment attenuated the rise in both PC (75%) and MDA (100%).


CONCLUSIONS
These data suggest that eccentric resistance exercise can increase blood biomarkers of oxidative stress in non-resistance trained females, and this vitamin E, C, and selenium supplementation can attenuate the rise in PC and MDA.
Goldfarb
Allan H
AH
Exercise and Sport Science Department, 250 HHP Building, University of North Carolina Greensboro, Greensboro, NC 27402, USA. ahgoldfa@uncg.edu
Bloomer
Richard J
RJ
McKenzie
Michael J
MJ
D000328:Adult; D000975:Antioxidants / Q000008:administration & dosage* / Q000494:pharmacology*; D001205:Ascorbic Acid / Q000008:administration & dosage / Q000494:pharmacology; D015415:Biomarkers / Q000097:blood; D004311:Double-Blind Method; D004359:Drug Therapy, Combination; D015444:Exercise; D005260:Female; D005978:Glutathione / Q000097:blood / Q000187:drug effects; D019803:Glutathione Disulfide / Q000097:blood / Q000187:drug effects; D006801:Humans; D008315:Malondialdehyde / Q000097:blood; D018384:Oxidative Stress / Q000187:drug effects*; D050050:Protein Carbonylation / Q000187:drug effects; D012643:Selenium / Q000008:administration & dosage / Q000494:pharmacology; D016896:Treatment Outcome; D014810:Vitamin E / Q000008:administration & dosage / Q000494:pharmacology; D016387:Women's Health
D000975:Antioxidants; D015415:Biomarkers; D014810:Vitamin E; D008315:Malondialdehyde; D005978:Glutathione; D012643:Selenium; D001205:Ascorbic Acid; D019803:Glutathione Disulfide