Titre
Changes in spatio-temporal gait parameters and vertical speed during an extreme mountain ultra-marathon.
Type
article
Institution
UNIL/CHUV/Unisanté + institutions partenaires
Périodique
Auteur(s)
Jeker, D.
Auteure/Auteur
Falbriard, M.
Auteure/Auteur
Vernillo, G.
Auteure/Auteur
Meyer, F.
Auteure/Auteur
Savoldelli, A.
Auteure/Auteur
Degache, F.
Auteure/Auteur
Schena, F.
Auteure/Auteur
Aminian, K.
Auteure/Auteur
Millet, G.P.
Auteure/Auteur
Liens vers les personnes
Liens vers les unités
ISSN
1536-7290
Statut éditorial
Publié
Date de publication
2020-11
Volume
20
Numéro
10
Première page
1339
Dernière page/numéro d’article
1345
Peer-reviewed
Oui
Langue
anglais
Notes
Publication types: Journal Article
Publication Status: ppublish
Publication Status: ppublish
Résumé
The aim of the present study was to investigate the effects of altitude and distance on uphill vertical speed (VS) and the main spatio-temporal gait parameters during an extreme mountain ultra-marathon. The VS, stride height (SH) and stride frequency (SF) of 27 runners were measured with an inertial sensor at the shank for two different altitude ranges (low 1300-2000 m vs high 2400-3200 m) of 10 mountains passes distributed over a 220 km course. There was a significant interaction (F(4,52) = 4.04, p < 0.01) for the effect of altitude and distance on VS. During the first passes, the mean VS was faster at lower altitudes, but this difference disappeared at a quarter of the race length, suggesting that neuromuscular fatigue influenced the uphill velocity to a larger extent than the oxygen delivery. The average VS, SH and SF were 547 ± 135 m/h, 0.23 ± 0.05 m and 0.66 ± 0.09 Hz. The individual VS change for each uphill portions was more strongly correlated with the changes in SH (r = 0.80, P < 0.001, n = 321) than SF (r = 0.43, P < 0.001, n = 321). This suggests a large effect of the knee extensors strength loss on the diminution of VS.
Sujets
PID Serval
serval:BIB_0ED51851F270
PMID
Date de création
2021-04-24T10:18:59.331Z
Date de création dans IRIS
2025-05-20T17:41:49Z
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Nom
287. Jeker EJSS20 verticalSpeed ultramarathon.pdf
Version du manuscrit
published
Taille
1019.53 KB
Format
Adobe PDF
PID Serval
serval:BIB_0ED51851F270.P001
Somme de contrôle
(MD5):997625ffbf5265d207d0786c700050e1