Biological markers of cardiac damage are not related to measures of cardiac systolic and diastolic function using cardiovascular magnetic resonance and echocardiography after an acute bout of prolonged endurance exercise

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Abstract
Objectives Seventeen male participants (mean (SD) (range): age 33.5 (6.5) years (46–26 years), body mass 80 (9.2) kg (100–63 kg), height 1.81 (0.06) m (1.93– 1.70 m)) ran a marathon to investigate the relationship between systolic function (using cardiac magnetic resonance (CMR)) and diastolic function (using echocardiography) against biomarkers of cardiac damage. Methods Echocardiographic and cardiac troponin I (cTnI)/N-terminal pro-B-type natriuretic peptide (NTproBNP) data were collected 24 h premarathon, immediately postmarathon and 6 h postmarathon. CMR data were collected 24 h premarathon and at 6 h postmarathon. Results Body mass was significantly reduced postmarathon (80 (9.2) vs 78.8 (8.6) kg; pConclusions Biomarkers of cardiac damage after prolonged exercise are not associated with either systolic or diastolic functional measures.

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