000197213 001__ 197213
000197213 005__ 20181203023435.0
000197213 0247_ $$2doi$$a10.1371/journal.pone.0084554
000197213 022__ $$a1932-6203
000197213 02470 $$2ISI$$a000330244500008
000197213 037__ $$aARTICLE
000197213 245__ $$aAlterations in Postural Control during the World's Most Challenging Mountain Ultra-Marathon
000197213 260__ $$bPublic Library Science$$c2014$$aSan Francisco
000197213 269__ $$a2014
000197213 300__ $$a12
000197213 336__ $$aJournal Articles
000197213 520__ $$aWe 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.
000197213 700__ $$uUniv Appl Sci Western Switzerland, Sch Hlth Sci, Hlth Res Unit, Lausanne, Switzerland$$aDegache, Francis
000197213 700__ $$0243941$$g155051$$uEcole Polytech Fed Lausanne, Appl Signal Proc Grp, Lausanne, Switzerland$$aVan Zaen, Jerome
000197213 700__ $$uUniv Lausanne, Dept Physiol, Inst Sports Sci, Fac Biol & Med, Lausanne, Switzerland$$aOehen, Lukas
000197213 700__ $$uUniv Appl Sci Western Switzerland, Dept Physiotherapy, Sch Hlth Sci, Lausanne, Switzerland$$aGuex, Kenny
000197213 700__ $$aTrabucchi, Pietro
000197213 700__ $$aMillet, Gegoire$$uUniv Lausanne, Dept Physiol, Inst Sports Sci, Fac Biol & Med, Lausanne, Switzerland
000197213 773__ $$j9$$tPlos One$$k1
000197213 909C0 $$0252331$$pASPG
000197213 909CO $$ooai:infoscience.tind.io:197213$$pSTI$$particle
000197213 917Z8 $$x106643
000197213 937__ $$aEPFL-ARTICLE-197213
000197213 973__ $$rREVIEWED$$sPUBLISHED$$aEPFL
000197213 980__ $$aARTICLE