title: Effects of vitamin E supplementation on recovery from repeated bouts of resistance exercise.
abstract: The purpose of this study was to examine the effects of vitamin E (VE) supplementation (1200 IU/day) on recovery responses to repeated bouts of resistance exercise. Non-resistance trained men were assigned to supplement with VE (n = 9) or placebo (PL; n = 9) for 3 weeks and then perform 3 resistance exercise sessions separated by 3 days of recovery (EX-1, EX-2, and EX-3). Performance was assessed at EX-1, EX-2, and EX-3. Fasting morning blood samples and perceived muscle soreness were obtained before EX-1 and for 10 consecutive days. Muscle soreness peaked after EX-1 and gradually returned to baseline values by day 6. Lower and upper body maximal strength and explosive power were significantly (p < or = 0.05) decreased at EX-2 and EX-3 (approximately 10%). Plasma malondialdehyde (MDA) was significantly elevated on days 7 and 8. There were no significant differences between VE and PL in muscle soreness, performance measures, or plasma MDA. Creatine kinase (CK) area under the curve from day 1 to day 10 was significantly greater for VE because of a nearly 2-fold greater increase in CK after EX-1 in VE, compared with PL (404 +/- 146 and 214 +/- 179 U/L, respectively). VE supplementation was not effective at attenuating putative markers of membrane damage, oxidative stress, and performance decrements after repeated bouts of whole-body concentric/eccentric resistance exercise.
authors.affiliation: Human Performance Laboratory, Ball State University, Muncie, Indiana 47306, USA.
authors.forename: Neva G
authors.initials: NG
authors.lastname: Avery
authors.forename: Jennifer L
authors.initials: JL
authors.lastname: Kaiser
authors.forename: Matthew J
authors.initials: MJ
authors.lastname: Sharman
authors.forename: Timothy P
authors.initials: TP
authors.lastname: Scheett
authors.forename: Dawn M
authors.initials: DM
authors.lastname: Barnes
authors.forename: Ana L
authors.initials: AL
authors.lastname: Gómez
authors.forename: William J
authors.initials: WJ
authors.lastname: Kraemer
authors.forename: Jeff S
authors.initials: JS
authors.lastname: Volek
mesh_terms: D000328:Adult; D000704:Analysis of Variance; D000975:Antioxidants / Q000627:therapeutic use*; D003402:Creatine Kinase / Q000097:blood; D019587:Dietary Supplements; D004311:Double-Blind Method; D006801:Humans; D008297:Male; D008315:Malondialdehyde / Q000097:blood; D016555:Matched-Pair Analysis; D018482:Muscle, Skeletal / Q000187:drug effects; D010146:Pain / Q000517:prevention & control; D014810:Vitamin E / Q000627:therapeutic use*; D014891:Weight Lifting / Q000502:physiology*
chemical_list: D000975:Antioxidants; D014810:Vitamin E; D008315:Malondialdehyde; D003402:Creatine Kinase