A long-duration race induces a decrease of left ventricular strains, twisting mechanics and myocardial work in trained adolescents.
Eur J Sport Sci
; 23(7): 1394-1404, 2023 Jul.
Article
en En
| MEDLINE
| ID: mdl-35757854
ABSTRACT
We investigated the acute cardiac consequences of a long-duration (>5â
h) adventure race in adolescent athletes from evaluations of left ventricular (LV) strains and myocardial work. Twenty trained male adolescents (i.e. 8 ± 4â
h·week-1 of endurance sports) aged 14-17 years participated in a competitive long-duration adventure race. Blood samples were collected before, immediately and 24â
h after the race to determine the time course of troponin I (cTnI) considered a myocardial damage biomarker. Resting echocardiography was conducted before and after the race to assess myocardial regional strains, LV twisting mechanics and myocardial work using speckle tracking echocardiography. The mean completion time of the race was 0538 ± 0020â
h, with a mean heart rate (HR) of 83 ± 5% of maximal HR. cTnI concentration significantly increased in 16/20 participants after the race (pre 0.001 ± 0.002 vs. post 0.244 ± 0.203â
ng·dL-1, p < .001) and returned to baseline within 24â
h. Stroke volume, ejection fraction and global longitudinal strains remained unchanged after the race, while LV twist and global myocardial work significantly decreased (8.6 ± 3.3 vs. 6.3 ± 3.3 deg and 2080 ± 250 vs. 1781 ± 334 mmHg%, p < .05). Diastolic function, indexes of myocardial relaxation and LV untwisting rate (-91.0 ± 19.0 vs. -56.4 ± 29.1â
deg·s-1, p < .001) were affected after the race. We demonstrated that in trained adolescents, a high-intensity endurance exercise of several hours induced an increase of the cTnI concentration associated with an alteration of myocardial function.HighlightsThis is the first study to explore the acute cardiac consequences of a very-long duration and high-intensity race in trained adolescentsThe cardiac evaluations before and immediately after the race were conducted using up-to-date advances in echocardiography, including not only regional left ventricular strains, rotations and twists, but also global myocardial work to consider changes in loading conditions that occur after such exercises.We observed exercise-induced cardiac fatigue in the adolescents, characterized by a drop in myocardial work, associated with an increase of cardiac troponin I in 16/20 participants.The cardiac alterations were principally observed at the apical level of the heart the apical strains and rotations were decreased and delayed. Consequently, left ventricular twist and twisting rates were also delayed, which probably affected the diastolic function after the race.
Palabras clave
Texto completo:
1
Colección:
01-internacional
Banco de datos:
MEDLINE
Asunto principal:
Troponina I
/
Ventrículos Cardíacos
Límite:
Adolescent
/
Humans
/
Male
Idioma:
En
Revista:
Eur J Sport Sci
Año:
2023
Tipo del documento:
Article
País de afiliación:
Francia