Background:High-intensity exercise can induce cardiac stress, manifested in both structure function and physiological status. Several studies have indicated that overtraining or
exhaustive exercise can greatly increase the production of cardiomyocyte radicals, increase cardiomyocyteapoptosis, and impact the endocrine function of the heart. In this study, 15 swimmers were
selected for high-intensity exercise, and blood samples were collected and 2Dechocardiogram images were takenbefore and after exercise. The influence of high-intensity exercise onthe athletes’
myocardium was analyzed, as well as the correlation between strains indifferent parts of themyocardium and markers of myocardial injury.
Methods:Fifteen swimmers participated in high-intensity exercises. Cardiac ultrasound was performed on each before and after exercise and left ventricular general strain (GS),
systolic general strain rate (GSR), and the differences between them (△GS and △GSR, respectively), before and after exercise were analyzed. Blood was collected afterfasting overnight and after
exercise to testfor cardiac enzyme indicators.so thatacorrelation between myocardial resilience and markers of myocardial injury could be determined.
Results:Most cardiac enzymes concentrations increase after exercise; cardiac troponin I isonly slightlyinfluenced but ispositively correlated with the degree of deformation of the
posterior wall basal segment △S , the deformation speed △SR , deformation degree of the posterior wall middle segment , and deformation degree of the front interval middle segment△S.Changes in
creatine kinase MBispositively correlated with the degree of deformation of the front wall middle segment △S, degree of deformation of the posterior wall apical segment △S, and overall strain change
Conclusions:After high-intensity exercise, the changes in ofcreatine kinase MB and cardiac troponin Tconcentrationsarepositively correlated with two-dimensional (2-D) ultrasound
deformation indices; therefore, these indices can be used to diagnose myocardial injuries. The apical segment hasa relatively high sensitivity to motor stimulation, and the injury canbe diagnosed in
theearly stages through 2-D strain ultrasound technology.After high-intensity exercise, changes in these two enzymesare positively correlated with 2-D deformation indices.