Individual hemoglobin mass response to normobaric and hypobaric 'live high–train low': A one-year crossover study
| Autor: | Grégoire P. Millet, Laurent Schmitt, Jon Peter Wehrlin, Severin Troesch, Roberto Cejuela-Anta, Anna Hauser, Thomas Steiner, Neil Robinson, Raphael Faiss, Jonas Saugy |
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| Přispěvatelé: | Universidad de Alicante. Departamento de Didáctica General y Didácticas Específicas, Research in Physical Education, Fitness and Performance (RIPEFAP) |
| Jazyk: | angličtina |
| Rok vydání: | 2017 |
| Předmět: |
Adult
Male Physiology Athletic Performance 030204 cardiovascular system & hematology Hemoglobins Young Adult 03 medical and health sciences 0302 clinical medicine Physiology (medical) Educación Física y Deportiva Humans Training Exercise physiology Hypoxia Exercise Hemoglobin mass Cross-Over Studies Chemistry Altitude Reproducibility of Results 030229 sport sciences Crossover study Athletes Anesthesia Hemoglobin Live high-train low |
| Zdroj: | RUA. Repositorio Institucional de la Universidad de Alicante Universidad de Alicante (UA) ResearcherID |
| Popis: | The purpose of this research was to compare individual hemoglobin mass (Hbmass) changes following a live high-train low (LHTL) altitude training camp under either normobaric hypoxia (NH) or hypobaric hypoxia (HH) conditions in endurance athletes. In a crossover design with a one-year washout, 15 male triathletes randomly performed two 18-day LHTL training camps in either HH or NH. All athletes slept at 2,250 meters and trained at altitudes mass was measured in duplicate with the optimized carbon monoxide rebreathing method before (pre) and immediately after (post) each 18-day training camp. Hbmass increased similarly in HH (916–957 g, 4.5 ± 2.2%, P < 0.001) and in NH (918–953 g, 3.8 ± 2.6%, P < 0.001). Hbmass changes did not differ between HH and NH ( P = 0.42). There was substantial interindividual variability among subjects to both interventions (i.e., individual responsiveness or the individual variation in the response to an intervention free of technical noise): 0.9% in HH and 1.7% in NH. However, a correlation between intraindividual ΔHbmass changes (%) in HH and in NH ( r = 0.52, P = 0.048) was observed. HH and NH evoked similar mean Hbmass increases following LHTL. Among the mean Hbmass changes, there was a notable variation in individual Hbmass response that tended to be reproducible. NEW & NOTEWORTHY This is the first study to compare individual hemoglobin mass (Hbmass) response to normobaric and hypobaric live high-train low using a same-subject crossover design. The main findings indicate that hypobaric and normobaric hypoxia evoked a similar mean increase in Hbmass following 18 days of live high-train low. Notable variability and reproducibility in individual Hbmass responses between athletes was observed, indicating the importance of evaluating individual Hbmass response to altitude training. |
| Databáze: | OpenAIRE |
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