In:
Journal of Applied Physiology, American Physiological Society, Vol. 89, No. 5 ( 2000-11-01), p. 1819-1824
Abstract:
The effect of hypoxia on the response to interval exercise was determined in eight elite female cyclists during two interval sessions: a sustained 3 × 10-min endurance set (5-min recovery) and a repeat sprint session comprising three sets of 6 × 15-s sprints (work-to-relief ratios were 1:3, 1:2, and 1:1 for the 1st, 2nd, and 3rd sets, respectively, with 3 min between each set). During exercise, cyclists selected their maximum power output and breathed either atmospheric air (normoxia, 20.93% O 2 ) or a hypoxic gas mix (hypoxia, 17.42% O 2 ). Power output was lower in hypoxia vs. normoxia throughout the endurance set (244 ± 18 vs. 226 ± 17, 234 ± 18 vs. 221 ± 25, and 235 ± 18 vs. 221 ± 25 W for 1st, 2nd, and 3rd sets, respectively; P 〈 0.05) but was lower only in the latter stages of the second and third sets of the sprints (452 ± 56 vs. 429 ± 49 and 403 ± 54 vs. 373 ± 43 W, respectively; P 〈 0.05). Hypoxia lowered blood O 2 saturation during the endurance set (92.9 ± 2.9 vs. 95.4 ± 1.5%; P 〈 0.05) but not during repeat sprints. We conclude that, when elite cyclists select their maximum exercise intensity, both sustained (10 min) and short-term (15 s) power are impaired during hypoxia, which simulated moderate (∼2,100 m) altitude.
Type of Medium:
Online Resource
ISSN:
8750-7587
,
1522-1601
DOI:
10.1152/jappl.2000.89.5.1819
Language:
English
Publisher:
American Physiological Society
Publication Date:
2000
detail.hit.zdb_id:
1404365-8
SSG:
12
SSG:
31
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