Journal of Applied Physiology Ad Instruments
HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
QUICK SEARCH:   [advanced]


     

J Appl Physiol 89: 1819-1824, 2000;
8750-7587/00 $5.00
This Article
Right arrow Full Text Free
Right arrow Full Text (PDF) Free
Right arrow Submit a response
Right arrow Alert me when this article is cited
Right arrow Alert me when eLetters are posted
Right arrow Alert me if a correction is posted
Right arrow Citation Map
Services
Right arrow Email this article to a friend
Right arrow Similar articles in this journal
Right arrow Similar articles in Web of Science
Right arrow Similar articles in PubMed
Right arrow Alert me to new issues of the journal
Right arrow Download to citation manager
Citing Articles
Right arrow Citing Articles via HighWire
Right arrow Citing Articles via Web of Science (19)
Right arrow Citing Articles via Google Scholar
Google Scholar
Right arrow Articles by Brosnan, M. J.
Right arrow Articles by Hawley, J. A.
Right arrow Search for Related Content
PubMed
Right arrow PubMed Citation
Right arrow Articles by Brosnan, M. J.
Right arrow Articles by Hawley, J. A.
Vol. 89, Issue 5, 1819-1824, November 2000

Impaired interval exercise responses in elite female cyclists at moderate simulated altitude

Maria J. Brosnan1, David T. Martin2, Allan G. Hahn2, Christopher J. Gore2, and John A. Hawley1

1 Exercise Metabolism Group, Department of Human Biology and Movement Science, Royal Melbourne Institute of Technology University, Bundoora, Victoria 3183; and 2 Sport Sciences and Sports Medicine Centre, Australian Institute of Sport, Belconnen, Australian Capital Territory, Australia 2616

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% O2) or a hypoxic gas mix (hypoxia, 17.42% O2). 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 O2 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.

hypoxia; exercise intensity; lactate; power output; cycling; percentage of arterial oxygen hemoglobin saturation from pulse oximetry


This article has been cited by other articles:


Home page
 Br. J. Sports. Med.Home page
R Tucker and T D Noakes
The physiological regulation of pacing strategy during exercise: a critical review
Br. J. Sports Med., June 1, 2009; 43(6): e1 - e1.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
R. J. Aughey, C. J. Gore, A. G. Hahn, A. P. Garnham, S. A. Clark, A. C. Petersen, A. D. Roberts, and M. J. McKenna
Chronic intermittent hypoxia and incremental cycling exercise independently depress muscle in vitro maximal Na+-K+-ATPase activity in well-trained athletes
J Appl Physiol, January 1, 2005; 98(1): 186 - 192.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
S. A. Clark, R. J. Aughey, C. J. Gore, A. G. Hahn, N. E. Townsend, T. A. Kinsman, C.-M. Chow, M. J. McKenna, and J. A. Hawley
Effects of live high, train low hypoxic exposure on lactate metabolism in trained humans
J Appl Physiol, February 1, 2004; 96(2): 517 - 525.
[Abstract] [Full Text] [PDF]

Home page
 J. Appl. Physiol.Home page
M. J. Truijens, H. M. Toussaint, J. Dow, and B. D. Levine
Effect of high-intensity hypoxic training on sea-level swimming performances
J Appl Physiol, February 1, 2003; 94(2): 733 - 743.
[Abstract] [Full Text] [PDF]


HOME HELP FEEDBACK SUBSCRIPTIONS ARCHIVE SEARCH TABLE OF CONTENTS
Visit Other APS Journals Online