Biomechanical adaptations during exhaustive runs at 90 to 120% of peak aerobic speed.

Détails

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Etat: Public
Version: Final published version
Licence: CC BY 4.0
ID Serval
serval:BIB_9C940A773259
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Biomechanical adaptations during exhaustive runs at 90 to 120% of peak aerobic speed.
Périodique
Scientific reports
Auteur⸱e⸱s
Patoz A., Blokker T., Pedrani N., Spicher R., Borrani F., Malatesta D.
ISSN
2045-2322 (Electronic)
ISSN-L
2045-2322
Statut éditorial
Publié
Date de publication
22/05/2023
Peer-reviewed
Oui
Volume
13
Numéro
1
Pages
8236
Langue
anglais
Notes
Publication types: Journal Article
Publication Status: epublish
Résumé
The aim of this study was to examine how running biomechanics (spatiotemporal and kinetic variables) adapt with exhaustion during treadmill runs at 90, 100, 110, and 120% of the peak aerobic speed (PS) of a maximal incremental aerobic test. Thirteen male runners performed a maximal incremental aerobic test on an instrumented treadmill to determine their PS. Biomechanical variables were evaluated at the start, mid, and end of each run until volitional exhaustion. The change of running biomechanics with fatigue was similar among the four tested speeds. Duty factor and contact and propulsion times increased with exhaustion (P ≤ 0.004; F ≥ 10.32) while flight time decreased (P = 0.02; F = 6.67) and stride frequency stayed unchanged (P = 0.97; F = 0.00). A decrease in vertical and propulsive peak forces were obtained with exhaustion (P ≤ 0.002; F ≥ 11.52). There was no change in the impact peak with exhaustion (P = 0.41; F = 1.05). For runners showing impact peaks, the number of impact peaks increased (P ≤ 0.04; [Formula: see text] ≥ 6.40) together with the vertical loading rate (P = 0.005; F = 9.61). No changes in total, external, and internal positive mechanical work was reported with exhaustion (P ≥ 0.12; F ≤ 2.32). Results suggest a tendency towards a "smoother" vertical and horizontal running pattern with exhaustion. A smoother running pattern refers to the development of protective adjustments, leading to a reduction of the load applied to the musculoskeletal system at each running step. This transition seemed continuous between the start and end of the running trials and could be adopted by the runners to decrease the muscle force level during the propulsion phase. Despite these changes with exhaustion, there were no changes in either gesture speed (no alteration of stride frequency) or positive mechanical work, advocating that runners unconsciously organize themselves to maintain a constant whole-body mechanical work output.
Mots-clé
Male, Humans, Fatigue, Exercise Test, Acclimatization, Biomechanical Phenomena, Muscles
Pubmed
Open Access
Oui
Création de la notice
30/05/2023 11:11
Dernière modification de la notice
23/01/2024 8:31
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