Background:The 2DSE technology is also called speckle tracking technology; it is popular in clinical diagnosis of various cardiovascular diseases. The technology can obtain the
parameters of myocardial movement, such as speed, direction, strain, strain rate and the other indices through software analysis. It does not only reflect the deformation movement of the heart in the
longitudinal direction, but also reflects the deformation movement of the heart in the radial and circular directions, Many studies focused on understanding the influence of high intensity training on
the athletes’cardiac function. The general finding was that sports training, especially endurance events (e.g. long-distance running, swimming and cycling) and strength events (e.g. weight lifting),
can increase the diameter of the heart and the weight of the left ventricle. Recently, an increasing number of studies have proven that intensive training has two effects on the athletes’
cardiovascular system: on the one hand, it can improve cardiovascular function and help it adapt to the physical environment of sports, while on the other hand, it can hurt the cardiovascular system.
Excessive training or long-term exhaustive exercise can damage the normal functioning and cause a change in the state of the heart from physiological to pathological. This study deployed
two-dimensional speckle tracking imaging analysis, using parameters such as the global systolic strain and the systolic strain rate which reflect left ventricular systolic function, to monitor the
change in the left ventricular myocardial strain and the strain rate of swimming athletes before and after high-intensity training. In addition, the study evaluated the influence of high-intensity
exercise on the athletes’ myocardial strain capacity.
Methods:Fifteen swimming athletes were selected asresearch objects.We applied 2DSE technology to track the2D ultrasound images of the apical four chamber, the apical two chamber and
the apical long axis before and after high-intensity,increasing-load exercise.We recorded indices such as the left ventricular global strain (GS), the left ventricular segmental wall peak strain (PS)
in 18 systoles, and analyzed the myocardial strain change before and after exercise.
Results:After high-intensity exercise, the overall myocardial straindecreased,especially the strain ofthe posterior wall, posterior divider, lateral wall, lower wall, and the basal
and middle segments of the anterior wall. The influence of exercise on myocardial strainwas greater on the basal and middle segments than on the apical segment.
Conclusions:One-time intensive exercise affects the myocardial muscle. This study evaluated whether we can more accurately evaluate the local and overall function using 2DSE
technology, and detect myocardial injury. The myocardial muscles in the apical segment and the myocardial wall are more sensitive tointensive exercise. The 2DSE technology can more precisely position
the motion-sensitive areas, and help locate myocardial injury.