Cardiac structure and function in response to a multi-stage marathon over 4486 km

Area of Science:

• Cardiology
• Sports Medicine
• Physiology

Background:

• Ultramarathon running involves extreme endurance challenges.
• The Trans Europe Foot Race (TEFR) spanned 64 days and 4486 km.
• Understanding cardiac adaptations to prolonged ultra-endurance exercise is crucial.

Purpose of the Study:

• To assess cardiac structure and function changes in ultra-endurance runners.
• To investigate the impact of the TEFR on cardiac parameters.
• To determine if prolonged extreme exercise leads to adverse cardiovascular remodeling.

Main Methods:

• Cardiac MRI was used to evaluate left ventricular mass and function in 20 runners during the TEFR.
• Blood samples were analyzed for cardiac biomarkers (troponin I, NT-pro-BNP) and growth factors (myostatin, GDF11).
• Follow-up scans were conducted eight months post-race for a subset of participants.

Main Results:

• Left ventricular mass significantly increased during the race (p < 0.001).
• Cardiac troponin I and NT-pro-BNP levels rose significantly in the early stages but plateaued.
• No significant changes were observed in other structural/functional parameters, and follow-up scans showed a return to baseline mass.

Conclusions:

• Prolonged ultra-endurance exercise induces physiological cardiac structural adaptation.
• The observed cardiac changes appear adaptive rather than indicative of adverse remodeling.
• The heart can recover to baseline parameters after extreme endurance events.