Commentaries on viewpoint: sacrificing economy to improve running performance--a reality in the ultramarathon?

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dc.contributor.author Perrey, S.
dc.contributor.author Joyner, Michael J.
dc.contributor.author Lucía Mulas, Alejandro
dc.contributor.author Nosaka, K.
dc.contributor.author Louis, J.
dc.contributor.author Pitsiladis, Yannis
dc.contributor.author Smoliga, J. M.
dc.contributor.author Zavorsky, G. S.
dc.contributor.author Hunter, G. R.
dc.contributor.author Fisher, G.
dc.contributor.author Kim, C. K.
dc.contributor.author Kim, H. J.
dc.date.accessioned 2014-04-09T10:23:41Z
dc.date.available 2014-04-09T10:23:41Z
dc.date.issued 2012 spa
dc.identifier.citation Perrey, S., Joyner, M., Ruiz, J. R., Lucia, A., Nosaka, K., Louis, J., ... & Kim, H. J. (2012). Commentaries on Viewpoint: Sacrificing economy to improve running performance—a reality in the ultramarathon?. Journal of Applied Physiology, 113(3), 510-512. spa
dc.identifier.issn 15221601 spa
dc.identifier.uri http://hdl.handle.net/11268/2700
dc.description.abstract The analyses of ultraendurance athletes have provided new insights into the limits of human performance capacity and into medical complications when going beyond the physical limits. Ultradistance running poses a unique stress on the athlete. In their Viewpoint, Millet et al. (3) argued that determinants of performance in ultraendurance are subjected to a compromise between two main parameters: energy cost and lower limb tissue injury. The latter results from a complex combination of extrinsic factors (training errors including lack of specific strength, inappropriate footwear, inappropriate running surface, and terrain) and intrinsic factors (poor flexibility, biomechanical lower extremity malalignment, anthropometry, previous injury, running experience). Concerning the former, environmental conditions, training, and perhaps most importantly fluid and fuel intake all contribute to energy balance state and so race performance. In fact, nutrient intake during ultradistance races has been found to be below the estimated energy cost (1). Despite a low relative intensity the energy cost of running (expressed in mlO2) is increased during ultradistance trail running races (2) compared with level running. This induces a marked negative energy balance state that was shown to reduce serum leptin concentrations during ultramarathon race (5). Thus suboptimal nutrition certainly would result in decreased performance under these circumstances. Finally, it is proposed that the most important factor linking both parameters explaining ultramarathon tolerance is the eccentric load of long-term running causing an association between skeletal muscle damage and impaired renal function through dehydration, rhabdomyolysis, and hemolysis (4) further exacerbated without optimal nutrition intake. spa
dc.language.iso eng spa
dc.title Commentaries on viewpoint: sacrificing economy to improve running performance--a reality in the ultramarathon? spa
dc.type article spa
dc.description.impact 3.484 JCR (2012) Q1, 7/84 Sport sciences; Q2, 20/80 Physiology spa
dc.identifier.doi 10.1152/japplphysiol.00666.2012 spa
dc.rights.accessRights restrictedAccess spa
dc.subject.uem Ejercicio físico - Aspectos fisiológicos spa
dc.subject.unesco Ciencias médicas spa
dc.description.filiation UEM spa
dc.peerreviewed Si spa

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