TY - JOUR
T1 - Effects of acute exposure to mild simulated hypoxia on hormonal responses to low-intensity resistance exercise in untrained men
AU - Ho, Jen Yu
AU - Huang, Tai Yu
AU - Chien, Yi Chieh
AU - Chen, Ying Chen
AU - Liu, Shui Yu
N1 - Funding Information:
Received 12 October 2013; accepted 14 March 2014. This study was funded by the National Science Council in Taiwan (Grant No. NSC100-2410-H-003-002) and partially supported by a grant for ‘Aim for the Top University Plan’ from National Taiwan Normal University and the Ministry of Education of Taiwan. Address correspondence to Jen-Yu Ho, Department of Athletic Performance, National Taiwan Normal University, Taipei, Taiwan. E-mail: [email protected]
PY - 2014/7/3
Y1 - 2014/7/3
N2 - 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.
AB - 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.
KW - anabolic hormones
KW - intermittent hypoxic training
KW - weight training
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U2 - 10.1080/15438627.2014.915834
DO - 10.1080/15438627.2014.915834
M3 - Article
C2 - 24950112
AN - SCOPUS:84903137211
SN - 1543-8627
VL - 22
SP - 240
EP - 252
JO - Research in Sports Medicine
JF - Research in Sports Medicine
IS - 3
ER -