Nummela and Rusko (2000) Acclimatization to altitude and normoxic training improve 400-m running performance at sea level

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Acclimatization to altitude and normoxic training improve 400-m running performance at sea level

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CONTRIBUTORS:

	Author:	Nummela, A.
	Author:	Rusko, H.

JOURNAL:

Journal of Sports Sciences (JSS), 18(6), ?? - ??.

YEAR:

2000

PUB TYPE:

Journal Article

SUBJECT(S):

ALTITUDE; TRAINING; ANAEROBIC-CAPACITY; LACTATE; SPRINTING; 400-M.; COMPARATIVE-STUDY; SEA-LEVEL; YOUNG-ADULT

DISCIPLINE:

No discipline assigned

HTTP:

LANGUAGE:

English

PUB ID:

103-366-757 (Last edited on 2002/02/27 18:44:58 US/Mountain)

SPONSOR(S):

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.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.l-1 tended to increase in the altitude house group but the response was significant only at 5 and 7 mmol.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.

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