Alterations in Postural Control during the World's Most Challenging Mountain Ultra-Marathon

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Serval ID
serval:BIB_BAE59A3B31B0
Type
Article: article from journal or magazin.
Collection
Publications
Institution
Title
Alterations in Postural Control during the World's Most Challenging Mountain Ultra-Marathon
Journal
PLoS ONE
Author(s)
Degache F., Van Zaen J., Oehen L., Guex K., Trabucchi P., Millet G.
ISSN
1932-6203
ISSN-L
1932-6203
Publication state
Published
Issued date
01/2014
Peer-reviewed
Oui
Volume
9
Number
1
Pages
e84554
Language
english
Notes
Degache, Francis Van Zaen, Jerome Oehen, Lukas Guex, Kenny Trabucchi, Pietro Millet, Gegoire PLoS One. 2014 Jan 21;9(1):e84554. doi: 10.1371/journal.pone.0084554. eCollection 2014 Jan 21.
Abstract
We investigated postural control (PC) effects of a mountain ultra-marathon (MUM): a 330-km trail run with 24000 m of positive and negative change in elevation. PC was assessed prior to (PRE), during (MID) and after (POST) the MUM in experienced ultra-marathon runners (n = 18; finish time = 126+/-16 h) and in a control group (n = 8) with a similar level of sleep deprivation. Subjects were instructed to stand upright on a posturographic platform over a period of 51.2 seconds using a double-leg stance under two test conditions: eyes open (EO) and eyes closed (EC). Traditional measures of postural stability (center of pressure trajectory analysis) and stabilogram-diffusion analysis (SDA) parameters were analysed. For the SDA, a significantly greater short-term effective diffusion was found at POST compared with PRE in the medio-lateral (ML; Dxs) and antero-posterior (AP) directions (Dys) in runners (p<0.05) The critical time interval (Ctx) in the ML direction was significantly higher at MID (p<0.001) and POST (p<0.05) than at PRE in runners. At MID (p<0.001) and POST (p<0.05), there was a significant difference between the two groups. The critical displacement (Cdx) in the ML was significantly higher at MID and at POST (p<0.001) compared with PRE for runners. A significant difference in Cdx was observed between groups in EO at MID (p<0.05) and POST (p<0.005) in the ML direction and in EC at POST in the ML and AP directions (p<0.05). Our findings revealed significant effects of fatigue on PC in runners, including, a significant increase in Ctx (critical time in ML plan) in EO and EC conditions. Thus, runners take longer to stabilise their body at POST than at MID. It is likely that the mountainous characteristics of MUM (unstable ground, primarily uphill/downhill running, and altitude) increase this fatigue, leading to difficulty in maintaining balance.
Pubmed
Web of science
Open Access
Yes
Create date
28/01/2014 11:51
Last modification date
20/08/2019 15:28
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