Study of the Aorta Adaptations to Exercise in Triathletes During Sports Season (CoATri)

Study Overview
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Brief Summary
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Regular sustained physical activity creates a cardiac remodelling : it is athlete's heart. In our preliminary work published in 2016, the investigators demonstrated in a small population of triathletes that there is also a vascular remodelling named athlete's artery. Moreover, the investigators know that left ventricle and aorta behave together like a couple. So they want to study by Cardiovascular Magnetic Resonance Imaging the impact of triathlon on the cardiac AND aortic remodelling.

Official Title
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Study of the Remodeling of the Ascending Aorta During the Sports Season in Long Distance Triathletes Versus Controls

Conditions
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Stiffness, Aortic, Cardiac Remodeling, Ventricular, Vascular Remodeling, Magnetic Resonance Imaging, Functional, Athletes

Intervention / Treatment
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* Device: Cardiac MRI
* Device: Applanation tonometry


Participation Criteria
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Eligibility Criteria
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Inclusion Criteria: to be enrolled in a social security plan. to have a BMI between 18,5 and 25 kg/m² to have received full information on the organization of the research and having signed its informed consent to have carried out a clinical screening adapted to the research *** Triathlete group: to have a minimum performance level: between 2h and 2h45 on an M triathlon during the past year (provide proof), to participate in 2018 in a long distance triathlon, i. e. at least distance L to have a defined training volume: less than 8 hours per week during the winter months and between 10 and 15 hours per week in preparation of the objective ***Control group: to have no more than 150 minutes of moderate physical activity per week (footing, brisk walking, cycling, etc.). Exclusion Criteria: Persons referred to in Articles L. 1121-5 to L. 1121-8 and L1122-2 of the Public Health Code Cardiovascular history including Ii.e. known heart rhythm disorders Chronic disease: diabetes, high blood pressure... Long-term drug therapies that may modify cardiovascular remodeling such as Conversion Enzyme Inhibitor, Angiotensin II Receptor Antagonist, Active smoking, even if occasional Contraindication to MRI

Ages Eligible for Study
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Minimum Age: 18 Years
Maximum Age: 39 Years

Sexes Eligible for Study
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Male

Accepts Healthy Volunteers
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Accepts Healthy Volunteers

Study Plan
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How is the study designed?
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Design Details

Primary Purpose: Basic Science
Allocation: Non-Randomized
Intervention Model: Parallel Assignment
Masking: None (Open Label)


Arms and Interventions

| Participant Group/Arm | Intervention/Treatment |
| --- | --- |
| Experimental: Triathletes<br>Every triathlete will realize three cardiac MRI exams.The second of those will be done at the fitness peak, 2-3 weeks before the main objective of the sports season. Training will be increased between the study beginning and the first MRI, and the second exam. After each cardiac MRI, an applanation tonometry examination will aslo be performed. | Device: Cardiac MRI<br>* Non injected cardiac MRI exam<br>Device: Applanation tonometry<br>* Applanation tonometry and ECG<br>|
| Experimental: Controls<br>Every control subject will also realize three cardiac MRI exams if possible at the same time as the triathletes.They must be not engaged in physical activity more than 150 minutes a week on average. After each cardiac MRI, an applanation tonometry examination will aslo be performed. | Device: Cardiac MRI<br>* Non injected cardiac MRI exam<br>Device: Applanation tonometry<br>* Applanation tonometry and ECG<br>|

What is the study measuring?
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Primary Outcome Measures

| Outcome Measure | Measure Description | Time Frame |
| --- | --- | --- |
| Aortic compliance in triathletes in mm2/mmHG | aortic compliance = pulsed pressure-to-absolute variation of aortic surface ratio | at baseline, at the fitness peak (6 to 10 months later) and at recovery (3 to 6 months after the fitness peak) | 

 Terms related to the study
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Keywords Provided by Centre Hospitalier Valida
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CMR, Aortic compliance, Aortic distensibility, Triathletes, Ventriculo-atrial coupling