Moderate hypoxic exposure for 4 weeks reduces body fat percentage and increases fat-free mass in trained individuals: a randomized crossover study
Autor: | Thomas Christian Bonne, Jan Sommer Jeppesen, Jacob Bejder, Andreas Breenfeldt Andersen, Niels Vidiendal Olsen, Jesús Rodríguez Huertas, Nikolai Baastrup Nordsborg |
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Rok vydání: | 2022 |
Předmět: | |
Zdroj: | Sleep and Breathing. |
ISSN: | 1522-1709 1520-9512 |
DOI: | 10.1007/s11325-022-02713-z |
Popis: | We evaluated whether or not changes in body composition following moderate hypoxic exposure for 4 weeks were different compared to sea level exposure.In a randomized crossover design, nine trained participants were exposed to 2320 m of altitude or sea level for 4 weeks, separated by 3 months. Body fat percentage (BF%), fat mass (FM), and fat-free mass (FFM) were determined before and after each condition by dual X-ray absorptiometry (DXA) and weekly by a bioelectrical impedance scanner to determine changes with a high resolution. Training volume was quantified during both interventions.Hypoxic exposure reduced (P 0.01) BF% by 2 ± 1 percentage points and increased (P 0.01) FFM by 2 ± 2% determined by DXA. A tending time × treatment effect existed for FM determined by DXA (P = 0.06), indicating a reduced FM in hypoxia by 8 ± 7% (P 0.01). Regional body analysis revealed reduced (P 0.01) BF% and FFM and an increased (P 0.01) FFM in the truncus area. No changes were observed following sea level. Bioelectrical impedance determined that BF%, FM, and FFM did not reveal any differences between interventions. Urine specific gravity measured simultaneously as body composition was identical. Training volume was similar between interventions (509 ± 70 min/week vs. 432 ± 70 min/week, respectively).Four weeks of altitude exposure reduced BF% and increased FFM in trained individuals as opposed to sea level exposure. The results also indicate that a decrease in FM is greater at altitude compared to sea level. Changes were specifically observed in the truncus area. |
Databáze: | OpenAIRE |
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