Improved lung function following dietary antioxidant supplementation in exercise-induced asthmatics

Stephanie P. Kurti, Jill D. Murphy, Christine S. Ferguson, Kelly R. Brown, Joshua R. Smith, Craig A. Harms

Research output: Contribution to journalArticlepeer-review


Introduction: Oxidative stress is a characteristic of exercise-induced asthma (EIA), however antioxidant supplementation may attenuate EIA. The purpose of this study was to determine if ascorbic (AsA) and α-tocopherol supplementation would improve airway function in subjects with EIA. Methods: A single-blind randomized crossover design with eight clinically diagnosed EIA subjects (22.0±0.7 year) and five healthy control subjects (28.2±1.4 year) was used. Subjects consumed vitamins (V) (AsA 500mg; α-tocopherol 300IU) or placebo (PLA) daily for three weeks, followed by a three week washout period and then three weeks of the alternative treatment. Ten-minute treadmill tests (90% VO2peak) were performed with pulmonary function testing (forced vital capacity (FVC), forced expiratory volume in one second (FEV1) and between 25 and 75% (FEF25-75%), and peak expiratory flow rates (PEFR)) measured pre-exercise and 1, 5, 15, and 30min post-exercise. Results: Supplementation led to significant improvements at minute 5 and minute 15 in FVC; FEV1; PERF; FEF25-75% and minute 30 in FEV1 and FEF25-75% post-exercise. Conclusion: AsA and α-tocopherol may aid the recovery of pulmonary function in subjects with EIA.

Original languageEnglish (US)
Pages (from-to)95-101
Number of pages7
JournalRespiratory Physiology and Neurobiology
StatePublished - Jan 1 2016

ASJC Scopus subject areas

  • Neuroscience(all)
  • Physiology
  • Pulmonary and Respiratory Medicine


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