Mechanical Alterations Associated with Repeated Treadmill Sprinting under Heat Stress.

Détails

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Etat: Public
Version: Final published version
ID Serval
serval:BIB_DAEDD01578E6
Type
Article: article d'un périodique ou d'un magazine.
Collection
Publications
Institution
Titre
Mechanical Alterations Associated with Repeated Treadmill Sprinting under Heat Stress.
Périodique
PloS one
Auteur(s)
Girard O., Brocherie F., Morin J.B., Racinais S., Millet G.P., Périard J.D.
ISSN
1932-6203 (Electronic)
ISSN-L
1932-6203
Statut éditorial
Publié
Date de publication
2017
Peer-reviewed
Oui
Volume
12
Numéro
2
Pages
e0170679
Langue
anglais
Notes
Publication types: Journal Article
Publication Status: epublish
Résumé
Examine the mechanical alterations associated with repeated treadmill sprinting performed in HOT (38°C) and CON (25°C) conditions.
Eleven recreationally active males performed a 30-min warm-up followed by three sets of five 5-s sprints with 25-s recovery and 3-min between sets in each environment. Constant-velocity running for 1-min at 10 and 20 km.h-1 was also performed prior to and following sprinting.
Mean skin (37.2±0.7 vs. 32.7±0.8°C; P<0.001) and core (38.9±0.2 vs. 38.8±0.3°C; P<0.05) temperatures, together with thermal comfort (P<0.001) were higher following repeated sprinting in HOT vs. CON. Step frequency and vertical stiffness were lower (-2.6±1.6% and -5.5±5.5%; both P<0.001) and contact time (+3.2±2.4%; P<0.01) higher in HOT for the mean of sets 1-3 compared to CON. Running distance per sprint decreased from set 1 to 3 (-7.0±6.4%; P<0.001), with a tendency for shorter distance covered in HOT vs. CON (-2.7±3.4%; P = 0.06). Mean vertical (-2.6±5.5%; P<0.01), horizontal (-9.1±4.4%; P<0.001) and resultant ground reaction forces (-3.0±2.8%; P<0.01) along with vertical stiffness (-12.9±2.3%; P<0.001) and leg stiffness (-8.4±2.7%; P<0.01) decreased from set 1 to 3, independently of conditions. Propulsive power decreased from set 1 to 3 (-16.9±2.4%; P<0.001), with lower propulsive power values in set 2 (-6.6%; P<0.05) in HOT vs. CON. No changes in constant-velocity running patterns occurred between conditions, or from pre-to-post repeated-sprint exercise.
Thermal strain alters step frequency and vertical stiffness during repeated sprinting; however without exacerbating mechanical alterations. The absence of changes in constant-velocity running patterns suggests a strong link between fatigue-induced velocity decrements during sprinting and mechanical alterations.

Mots-clé
Adult, Body Temperature, Exercise Test, Fatigue, Hot Temperature, Humans, Male, Mechanical Phenomena, Neural Networks (Computer), Psychomotor Performance, Running, Stress, Physiological, Task Performance and Analysis
Pubmed
Web of science
Open Access
Oui
Création de la notice
07/02/2017 18:54
Dernière modification de la notice
20/08/2019 17:00
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