Oxygen availability affects exercise capacity, but not neuromuscular fatigue characteristics of knee extensors, during exhaustive intermittent cycling.
Altitude
Exhaustion
Fatigue
Graded hypoxia
Intermittent exercise
Neuromuscular fatigue
Transcranial magnetic stimulation
Journal
European journal of applied physiology
ISSN: 1439-6327
Titre abrégé: Eur J Appl Physiol
Pays: Germany
ID NLM: 100954790
Informations de publication
Date de publication:
Jan 2021
Jan 2021
Historique:
received:
16
07
2020
accepted:
05
09
2020
pubmed:
1
10
2020
medline:
29
9
2021
entrez:
30
9
2020
Statut:
ppublish
Résumé
To compare the effects of different hypoxia severities on exercise capacity, cardio-respiratory, tissue oxygenation and neuromuscular fatigue characteristics in response to exhaustive intermittent cycling. Eleven well-trained cyclists, repeated supra-maximal cycling efforts of 15 s (30% of anaerobic power reserve, 609 ± 23 W), interspersed with 45 s of passive rest until task failure. The exercise was performed on separate days in normoxia (SL; simulated altitude/end-exercise arterial oxygen saturation = 0 m/~ 96%), moderate (MH; 2200 m/~ 90%) and severe (SH; 4200 m/~ 79%) hypoxia in a cross-over design. Neuromuscular tests, including brief (5 s) and sustained (30 s) maximal isometric voluntary contractions of the knee extensors, were performed at baseline and exhaustion. Exercise capacity decreased with hypoxia severity (23 ± 9, 16 ± 6 and 9 ± 3 cycle efforts in SL, MH and SH, respectively; P < 0.001; η Despite reduced exercise capacity with increasing severity of hypoxia during exhaustive intermittent cycling, neuromuscular fatigue characteristics were not different at task failure and cardiovascular solicitation neared maximum values.
Identifiants
pubmed: 32995960
doi: 10.1007/s00421-020-04495-2
pii: 10.1007/s00421-020-04495-2
doi:
Types de publication
Journal Article
Langues
eng
Sous-ensembles de citation
IM
Pagination
95-107Références
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