異なるレベルの低酸素環境における小筋群のレジスタンス運動に対するホルモン応答

概要

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This study aimed to clarify the hormonal responses to resistance exercise with small muscle groups in different levels of hypoxia. Eight healthy male adults (23±1 yrs) performed four trials: 1) exercise in normal conditions (N); 2) exercise in hypoxic conditions corresponding to 3000m above sea level (H1); 3) exercise in 5000m above sea level (H2); and 4) rest in 5000m above sea level (C). N, H1, and H2 performed 3 sets of exhaustive arm curl exercise at the workload of 8 repetition maximum in each condition, and C just kept rest in the condition. Mean values of SpO_2 in H2 and C were significantly lower than those in N and H1 through the experiment (P<0.01). Growth hormone (GH) concentration at immediately and 15 min after the exercise in C were significantly higher than those in H1 (P<0.05). Furthermore, the values in C and H2 at 30 min after the exercise were significantly higher than that in N (P<0.05), but no significant differences were found in GH between N and H1. Cortisol concentration at 30 min after the exercise was significantly higher in H2 compared to that in N (P<0.05). These results suggest that GH and cortisol were increased in a hypoxic conditions corresponding to 5000m above sea level compared to normal conditions, but not in 〜3000m above sea level. Furthermore, it is also suggested that the increased those hormones would be mainly attributed to severe hypoxic stimulus rather than exercise stimulus.
2012-07-20