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- Title
Does Intermittent Hypoxia Increase Erythropoiesis in Professional Cyclists During a 3-Week Race?
- Authors
Villa, José G.; Lucía, Alejandro; Marroyo, José A.; Avila, Concepción; Jiménez, Fernando; García-López, Juan; Earnest, Conrad P.; Cördova, Alfredo
- Abstract
In this study we examined the effects of intermittent hypoxia exposure (IHE) in a group of professional cyclists (n = 6; age 26 α 1 yr) competing in the 2001 Vuelta a Espaϱa. After each daily stage, treated subjects received four 5-min bouts of normobaric IHE (mean O2 concentration of 12.6%, simulating a mean altitude of 4,000 m) interspersed with 5-min bouts of breathing hotel room air (normoxia) until completing a total IHE of 20-min duration. The primary outcome, compared to a control group of similar characteristics not receiving IHE (n = 5; age 25 α 1 yr), was the % increase in erythropoietin (Epo) from the beginning to the end of the Vuelta. Statistical analysis showed that Epo increase tended to be higher (p = 0.052) in the IHE group than in controls (37.4 α 5.8% vs. –4.4 α 19.5%, respectively). However, IHE had no effect on reticulocytes or erythrocyte count (p > 0.05).
- Subjects
HYPOXEMIA; HEMOGLOBINS; HEMATOCRIT; ERYTHROCYTES; RETICULOCYTES
- Publication
Canadian Journal of Applied Physiology, 2005, Vol 30, Issue 1, p61
- ISSN
1066-7814
- Publication type
Article
- DOI
10.1139/h05-105