title: Intermittent short-term graded running performance in middle-distance runners in hypobaric hypoxia.
abstract: This study investigated whether in trained middle-distance runners, intermittent short-term graded running performance is affected by a hypobaric hypoxic environment (simulated 2,500 m) (H). Seven male middle-distance runners performed an aerobic performance test and an intermittent short-term graded anaerobic running-performance test (MART) both in H and in a normobaric normoxic environment (N). VO(2max) and OBLA were markedly lower (by 18.1% and 8.7%, respectively) in H than in N. In MART, neither maximal running velocity (V(max)) nor exhaustion-time was different between N and H (454 (7) m min(-1) vs. 451 (6) m min(-1), respectively, and 208.7 (5.2) s vs. 205.7 (4.2) s, respectively). The blood lactate concentration at sub-maximal running speed (425 m min(-1)) was significantly greater in H than in N (paired t-test: P<0.05). These results suggest that, in trained middle-distance runners, intermittent short-term graded running performance is not affected by H, despite a considerable decrease in aerobic power in H during the aerobic performance test.
authors.affiliation: Institute of Health and Sports Science, University of Tsukuba, Tsukuba City, Ibaraki 305-8574, Japan.
authors.forename: Takeshi
authors.initials: T
authors.lastname: Ogawa
authors.forename: Keiichi
authors.initials: K
authors.lastname: Ohba
authors.forename: Yoshiharu
authors.initials: Y
authors.lastname: Nabekura
authors.forename: Jun
authors.initials: J
authors.lastname: Nagai
authors.forename: Keiji
authors.initials: K
authors.lastname: Hayashi
authors.forename: Hiroyuki
authors.initials: H
authors.lastname: Wada
authors.forename: Takeshi
authors.initials: T
authors.lastname: Nishiyasu
mesh_terms: D000328:Adult; D000693:Anaerobiosis; D001274:Atmospheric Pressure; D006801:Humans; D000860:Hypoxia / Q000503:physiopathology*; D008297:Male; D012420:Running; D013647:Task Performance and Analysis