title: Effects of acute exposure to mild simulated hypoxia on hormonal responses to low-intensity resistance exercise in untrained men.
abstract: This study examined hormonal responses to low-intensity resistance exercise under mild simulated hypoxia. Ten resistance untrained men performed five sets of 15 repetitions of squat exercise at 30% of 1RM under normobaric hypoxia (FiO2 = 15%) and normoxia in a cross-over and counter-balanced design. Blood lactate (LAC), growth hormone (GH), total testosterone (T) and cortisol (C) were measured at pre-exercise, immediately post-exercise and 15 minutes post-exercise. LAC, GH and T significantly increased immediately after squat exercise in both trials (p < 0.05). While T returned to baseline, GH remained significantly greater at 15 minutes post-exercise. Cortisol significantly decreased immediately after and 15 minutes post-exercise in both trials (p < 0.05). No significant differences were observed between two trials in LAC, GH, T and C. It was concluded that low-intensity resistance exercise performed under mild simulated hypoxia does not induce greater anabolic hormonal responses in resistance untrained men.
authors.affiliation: a Department of Athletic Performance , National Taiwan Normal University , Taipei , Taiwan.
authors.forename: Jen-Yu
authors.initials: JY
authors.lastname: Ho
authors.forename: Tai-Yu
authors.initials: TY
authors.lastname: Huang
authors.forename: Yi-Chieh
authors.initials: YC
authors.lastname: Chien
authors.forename: Ying-Chen
authors.initials: YC
authors.lastname: Chen
authors.forename: Shui-Yu
authors.initials: SY
authors.lastname: Liu
mesh_terms: D000328:Adult; D015415:Biomarkers / Q000097:blood; D018592:Cross-Over Studies; D015444:Exercise / Q000502:physiology*; D064368:Healthy Volunteers; D019382:Human Growth Hormone / Q000097:blood*; D006801:Humans; D006854:Hydrocortisone / Q000097:blood*; D000860:Hypoxia / Q000097:blood* / Q000209:etiology / Q000503:physiopathology; D019344:Lactic Acid / Q000097:blood*; D008297:Male; D055070:Resistance Training / Q000379:methods*; D013739:Testosterone / Q000097:blood*
chemical_list: D015415:Biomarkers; D019382:Human Growth Hormone; D019344:Lactic Acid; D013739:Testosterone; D006854:Hydrocortisone
keywords: anabolic hormones; intermittent hypoxic training; weight training