An Extreme Mountain Ultra-Marathon Decreases the Cost of Uphill Walking and Running

Détails

Ressource 1Télécharger: fphys-07-00530.pdf (667.87 [Ko])
Etat: Public
Version: Final published version
ID Serval
serval:BIB_1134593335A2
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
An Extreme Mountain Ultra-Marathon Decreases the Cost of Uphill Walking and Running
Périodique
Frontiers in Physiology
Auteur(s)
Vernillo G., Savoldelli A., Skafidas S., Zignoli A., La Torre A., Pellegrini B., Giardini G., Trabucchi P., Millet G. P., Schena F.
ISSN-L
1664-042X
Statut éditorial
Publié
Date de publication
2016
Peer-reviewed
Oui
Volume
7
Numéro
530
Pages
NA
Langue
anglais
Notes
Vernillo, Gianluca
Savoldelli, Aldo
Skafidas, Spyros
Zignoli, Andrea
La Torre, Antonio
Pellegrini, Barbara
Giardini, Guido
Trabucchi, Pietro
Millet, Gregoire P
Schena, Federico
ENG
Switzerland
Front Physiol. 2016 Nov 8;7:530. eCollection 2016.
Résumé
Purpose: To examine the effects of the world's most challenging mountain ultramarathon (MUM, 330 km, cumulative elevation gain of +24,000 m) on the energy cost and kinematics of different uphill gaits. Methods: Before (PRE) and immediately after (POST) the competition, 19 male athletes performed three submaximal 5-min treadmill exercise trials in a randomized order: walking at 5 km.h-1, +20%; running at 6 km.h-1, +15%; and running at 8 km.h-1, +10%. During the three trials, energy cost was assessed using an indirect calorimetry system and spatiotemporal gait parameters were acquired with a floor-level high-density photoelectric cells system. Results: The average time of the study participants to complete the MUM was 129 h 43 min 48 s (range: 107 h 29 min 24 s to 144 h 21 min 0 s). Energy costs in walking (-11.5 +/- 5.5%, P < 0.001), as well as in the first (-7.2 +/- 3.1%, P = 0.01) and second (-7.0 +/- 3.9%, P = 0.02) running condition decreased between PRE and POST, with a reduction both in the heart rate (-11.3, -10.0, and -9.3%, respectively) and oxygen uptake only for the walking condition (-6.5%). No consistent and significant changes in the kinematics variables were detected (P-values from 0.10 to 0.96). Conclusion: Though fatigued after completing the MUM, the subjects were still able to maintain their uphill locomotion patterns noted at PRE. The decrease (improvement) in the energy costs was likely due to the prolonged and repetitive walking/running, reflecting a generic improvement in the mechanical efficiency of locomotion after ~130 h of uphill locomotion rather than constraints imposed by the activity on the musculoskeletal structure and function.
Pubmed
Open Access
Oui
Création de la notice
15/02/2017 10:33
Dernière modification de la notice
20/08/2019 13:38
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