title: Acclimatization to altitude and normoxic training improve 400-m running performance at sea level.
abstract: To investigate the benefits of 'living high and training low' on anaerobic performance at sea level, eight 400-m runners lived for 10 days in normobaric hypoxia in an altitude house (oxygen content = 15.8%) and trained outdoors in ambient normoxia at sea level. A maximal anaerobic running test and 400-m race were performed before and within 1 week of living in the altitude house to determine the maximum speed and the speeds at different submaximal blood lactate concentrations (3, 5, 7, 10 and 13 mmol x l(-1)) and 400-m race time. At the same time, ten 400-m runners lived and trained at sea level and were subjected to identical test procedures. Multivariate analysis of variance indicated that the altitude house group but not the sea-level group improved their 400-m race time during the experimental period (P < 0.05). The speeds at blood lactate concentrations of 5-13 mmol x l(-1) tended to increase in the altitude house group but the response was significant only at 5 and 7 mmol x l(-1) (P < 0.05). Furthermore, resting blood pH was increased in six of the eight altitude house athletes from 0.003 to 0.067 pH unit (P < 0.05). The results of this study demonstrate improved 400-m performance after 10 days of living in normobaric hypoxia and training at sea level. Furthermore, the present study provides evidence that changes in the acid-base balance and lactate metabolism might be responsible for the improvement in sprint performance.
authors.affiliation: KIHU Research Institute for Olympic Sports, Jyväskylä, Finland. atn@kihu.jyu.fi
authors.forename: A
authors.initials: A
authors.lastname: Nummela
authors.forename: H
authors.initials: H
authors.lastname: Rusko
mesh_terms: D000064:Acclimatization; D000136:Acid-Base Equilibrium; D000328:Adult; D000531:Altitude; D000704:Analysis of Variance; D005260:Female; D006801:Humans; D019344:Lactic Acid / Q000378:metabolism; D008297:Male; D012420:Running / Q000502:physiology*
chemical_list: D019344:Lactic Acid