Influence of Acute Moderate Hypoxia on Time to Exhaustion at vV˙O2max in Unacclimatized Runners
| Autor: | Véronique Billat, Richard Heubert, P. M. Lepretre, J. P. Koralsztein, F. P. Gazeau |
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| Rok vydání: | 2003 |
| Předmět: |
Adult
Acclimatization Oxygene Physical Therapy Sports Therapy and Rehabilitation Running Time Oxygen Consumption Animal science Reference Values medicine Humans Orthopedics and Sports Medicine Treadmill Hypoxia computer.programming_language Time to exhaustion Chemistry Altitude VO2 max Hypoxia (medical) Incremental test vVO2max Physical Endurance Moderate hypoxia medicine.symptom human activities computer |
| Zdroj: | International Journal of Sports Medicine. 24:9-14 |
| ISSN: | 1439-3964 0172-4622 |
| DOI: | 10.1055/s-2003-37251 |
| Popis: | Eight unacclimatized long-distance runners performed, on a level treadmill, an incremental test to determine the maximal oxygen uptake (VO2max) and the minimal velocity eliciting VO2max (vVO2max) in normoxia (N) and acute moderate hypoxia (H) corresponding to an altitude of 2,400 m (PIO 2 of 109 mmHg). Afterwards, on separate days, they performed two all-out constant velocity runs at vO2 max in a random order (one in N and the other in H). The decrease in VO2max between N and H showed a great degree of variability amongst subjects as VO2max decreased by 8.9 +/- 4 ml x min(-1) x kg)(-1) in H vs. N conditions (-15.3 +/- 6.3 % with a range from -7.9 % to -23.8 %). This decrease in VO2max was proportional to the value of VO2max (VO2max vs. delta VO2max N-H, r = 0.75, p = 0.03). The time run at vVO2max was not affected by hypoxia (483 +/- 122 vs. 506 +/- 148 s, in N and H, respectively, p = 0.37). However, the greater the decrease in vVO2max during hypoxia, the greater the runners increased their time to exhaustion at vVO2max (vVO2max N-H vs. tlim @vVO2max N-H, r = -0.75, p = 0.03). In conclusion, this study showed that there was a positive association between the extent of decrease in vVO2max, and the increase in run time at vVO2max in hypoxia. |
| Databáze: | OpenAIRE |
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