A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
Hemoglobin mass and performance responses during 4 weeks of normobaric “live high–train low and high” (2023)
Kettunen, O., Leppävuori, A., Mikkonen, R., Peltonen, J. E., Nummela, A., Wikström, B., & Linnamo, V. (2023). Hemoglobin mass and performance responses during 4 weeks of normobaric “live high–train low and high”. Scandinavian Journal of Medicine and Science in Sports, 33(8), 1335-1344. https://doi.org/10.1111/sms.14378
JYU-tekijät tai -toimittajat
Julkaisun tiedot
Julkaisun kaikki tekijät tai toimittajat: Kettunen, Oona; Leppävuori, Antti; Mikkonen, Ritva; Peltonen, Juha E.; Nummela, Ari; Wikström, Bettina; Linnamo, Vesa
Lehti tai sarja: Scandinavian Journal of Medicine and Science in Sports
ISSN: 0905-7188
eISSN: 1600-0838
Julkaisuvuosi: 2023
Volyymi: 33
Lehden numero: 8
Artikkelin sivunumerot: 1335-1344
Kustantaja: Wiley
Julkaisumaa: Britannia
Julkaisun kieli: englanti
DOI: https://doi.org/10.1111/sms.14378
Julkaisun avoin saatavuus: Avoimesti saatavilla
Julkaisukanavan avoin saatavuus: Osittain avoin julkaisukanava
Julkaisu on rinnakkaistallennettu (JYX): https://jyx.jyu.fi/handle/123456789/86765
Tiivistelmä
To investigate whether 4 weeks of normobaric “live high–train low and high” (LHTLH) causes different hematological, cardiorespiratory, and sea-level performance changes compared to living and training in normoxia during a preparation season.
Methods
Nineteen (13 women, 6 men) cross-country skiers competing at the national or international level completed a 28-day period (∼18 h day−1) of LHTLH in normobaric hypoxia of ∼2400 m (LHTLH group) including two 1 h low-intensity training sessions per week in normobaric hypoxia of 2500 m while continuing their normal training program in normoxia. Hemoglobin mass (Hbmass) was assessed using a carbon monoxide rebreathing method. Time to exhaustion (TTE) and maximal oxygen uptake (VO2max) were measured using an incremental treadmill test. Measurements were completed at baseline and within 3 days after LHTLH. The control group skiers (CON) (seven women, eight men) performed the same tests while living and training in normoxia with ∼4 weeks between the tests.
Results
Hbmass in LHTLH increased 4.2 ± 1.7% from 772 ± 213 g (11.7 ± 1.4 g kg−1) to 805 ± 226 g (12.5 ± 1.6 g kg−1) (p < 0.001) while it was unchanged in CON (p = 0.21). TTE improved during the study regardless of the group (3.3 ± 3.4% in LHTLH; 4.3 ± 4.8% in CON, p < 0.001). VO2max did not increase in LHTLH (61.2 ± 8.7 mL kg−1 min−1 vs. 62.1 ± 7.6 mL kg−1 min−1, p = 0.36) while a significant increase was detected in CON (61.3 ± 8.0–64.0 ± 8.1 mL kg−1 min−1, p < 0.001).
Conclusions
Four-week normobaric LHTLH was beneficial for increasing Hbmass but did not support the short-term development of maximal endurance performance and VO2max when compared to the athletes who lived and trained in normoxia.
YSO-asiasanat: korkeanpaikanharjoittelu; harjoitusvaste; hemoglobiini; suorituskyky; maksimaalinen hapenotto; hiihtäjät
Liittyvät organisaatiot
OKM-raportointi: Kyllä
Raportointivuosi: 2023
Alustava JUFO-taso: 2
