Titre :

Specific left ventricular twist-untwist mechanics during exercise in children.

Auteur(s) :

Boissière, Julien [Auteur]
Unité de Recherche Pluridisciplinaire Sport, Santé, Société (URePSSS) - ULR 7369 - ULR 4488 [URePSSS]
Maufrais, Claire [Auteur]
Avignon Université [AU]
Baquet, Georges [Auteur]
Unité de Recherche Pluridisciplinaire Sport, Santé, Société (URePSSS) - ULR 7369
Schuster, Iris [Auteur]
Université de Montpellier [UM]
Dauzat, Michel [Auteur]
Université de Montpellier [UM]
Doucende, Grégory [Auteur]
Avignon Université [AU]
Obert, Philippe [Auteur]
Avignon Université [AU]
Berthoin, Serge [Auteur]
Unité de Recherche Pluridisciplinaire Sport, Santé, Société (URePSSS) - ULR 7369
Nottin, Stéphane [Auteur]
Avignon Université [AU]

Titre de la revue :

Journal of the American Society of Echocardiography : official publication of the American Society of Echocardiography

Nom court de la revue :

J Am Soc Echocardiogr

Numéro :

26

Pagination :

1298-1305

Date de publication :

2013-11-01

ISSN :

1097-6795

Mot(s)-clé(s) en anglais :

Adolescent
Adult
Aging
Child
Echocardiography
Exercise
Female
France
Heart Ventricles
Humans
Male
Physical Exertion
Rotation
Ventricular Function, Left
Young Adult
AVC
Aortic valve closure
Children
Exercise
Exercise at 20% of maximal aerobic power
Exercise at 30% of maximal aerobic power
Exercise at 40% of maximal aerobic power
IVRT
Isovolumetric relaxation time
LV
Left ventricle
Left ventricular
SR
STE
Speckle-tracking echocardiography
Strain rate
Untwisting angle during isovolumetric relaxation time
W1
W2
W3
°UT(IVRT)

Discipline(s) HAL :

Sciences du Vivant [q-bio]

Résumé en anglais : [en]

In adults, left ventricular (LV) systolic twist is an important factor that determines LV filling, both at rest and during exercise. In children, lower LV twist has been demonstrated at rest, but its adaptation during ...
Lire la suite >In adults, left ventricular (LV) systolic twist is an important factor that determines LV filling, both at rest and during exercise. In children, lower LV twist has been demonstrated at rest, but its adaptation during exercise and its functional consequences on LV filling are unknown. Using speckle-tracking echocardiography, LV twist-untwist mechanics were studied in 25 children (aged 10-12 years) and 20 young adults (aged 18-44 years) at rest and during three exercise workloads performed at 20%, 30%, and 40% of their maximal aerobic power. At rest, LV twist was lower in children, because of a higher temporal dispersion of peak rotation between base and apex. During exercise, the increase of basal rotation was blunted in children compared with adults (-6.7 ± 2.7° vs -9.0 ± 2.0° at 40% of maximal aerobic power, P < .05). Consequently, LV twist increased to a lesser extent (13.0 ± 5.0° vs 15.8 ± 4.5° at 40% of maximal aerobic power, P < .05). The increase in LV untwisting rates during exercise was also lower in children, leading to a lower percentage of untwisting during early diastole (8 ± 8% vs 29 ± 20% at 40% of maximal aerobic power, P < .001). Consequently, during early diastole, the normal timing of diastolic events observed in young adults, with untwist occurring before radial displacement, was blunted in children. Nevertheless, children exhibited normal LV filling due to higher diastolic radial and longitudinal strain rates. Twist-untwist mechanics may evolve with advancing age. In children, early diastolic LV untwisting appears to be less important than in adults. Their better LV intrinsic myocardial relaxation may ensure adequate LV filling during exercise without dependence on the additional effect of suction resulting from LV energy recoil.Lire moins >

Comité de lecture :

Oui

Audience :

Non spécifiée

Établissement(s) :

Université de Lille
Univ. Artois
Univ. Littoral Côte d’Opale

Collections :

• Unité de Recherche Pluridisciplinaire Sport, Santé, Société (URePSSS) - ULR 7369

Équipe(s) de recherche :

Activité Physique, Muscle, Santé (APMS)

Date de dépôt :

2021-11-14T10:41:48Z
2021-11-18T10:36:40Z