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sports training is perquisite for excel in track and field athletes, which effects the changes of functional capacity of heart as well as circulatory system. The study investigates the intricate process of functional adaptation of the left ventricle in track and field athletes. Echocardiography is a vital tool for a non-invasive assessment of cardiac anatomy and function that can differentiate between normal and abnormal cardiac changes. In general, the athletes who participates in endurance events have bigger hearts, which aids in the assessment of left ventricular functional adaptation. Heart rate adaptation in athletes is influenced by age, gender, ethnicity, and level of sport. Exercise that is high in intensity alters the heart's structure, electrical activity, and overall functionality. The volume and intensity of endurance exercise influences the functional adaptations of the left ventricle. The present study systematically discussed the effects of different track and field events (isometric or isotonic training) on cardiac left ventricle of athletes and it focus the necessity of customized training and coordinated healthcare for the best possible cardiovascular health. Keywords: Track and Field Athletes; Echocardiography and Left Ventricular Functional Adaptation Abbreviations: LV: Left Ventricle; LVM: Left Ventricular Mass; EDV: End-Diastolic Volume; LVH: Left Ventricular Hypertrophy; SV: Stroke Volume; RES: Resistance Training; EDV: End Diastolic Volume;

training) on cardiac left ventricle of athletes and it focus the necessity of customized training and coordinated healthcare for the best possible cardiovascular health. Keywords: Track and Field Athletes; Echocardiography and Left Ventricular Functional Adaptation Abbreviations: LV: Left Ventricle; LVM: Left Ventricular Mass; EDV: End-Diastolic Volume; LVH: Left Ventricular Hypertrophy; SV: Stroke Volume; RES: Resistance Training; EDV: End Diastolic Volume; ET: Endurance Training; LVEDV: Left Ventricular Systolic Volume; SVI: Stroke Index; QI: Cardiac Index; FS : Fractional Shortening; EF: Ejection Fraction. Introduction Athletes perform a variety of activities such as throwing, jumping and running which requires a good amount of physical fitness. The main elements of fitness are speed, agility, muscular strength, muscular endurance, and cardiovascular fitness [1]. The dynamic interaction between physical activity and cardiovascular adaptation is an important

Open Access Journal of Kinesiology and Sports Medicine 2Mukhopadhyay K, et al. Echocardiographic Insights into Left Ventricular Functional Adaptation in Track and Field Athletes: A Comprehensive Review. Open J of Kinesiology & sports Med 2024, 2(1): 000113. Copyright© Mukhopadhyay K, et al. factor influencing sports performance, especially in track and field. Acute exercise can cause anatomic and functional changes in the left ventricle (LV) of the heart. The increased need for oxygen supply as a result of physical activity can be compensated by our physiological system. A thorough understanding of the complex physiological changes that occur in the human body is necessary for the achievement of athletic performance. One of the main factors contributing to heart health is left ventricular function [2]. The adaptation of the cardiovascular system is one of the most important results of regular physical training. Competitive sports and public health are two areas that express the true meaning of the “athlete’s heart” [3]. In the cardiovascular system, the left ventricle plays an important role in pumping blood throughout the body. Alteration of left ventricular function is necessary to improve athletic performance and cardiovascular fitness in track and field athletes [2]. Adaptive hypertrophy, or increased mass and size of the left ventricle, is a result of the left ventricle’s response to exercise [3]. Training and stress can change the body and make it work better. Training based on training principles requires more work and results in greater adaptation to increased load. These adaptations include decreased resting heart rate, increased stroke volume, increased haemoglobin levels, increased oxygen consumption, muscle hypertrophy, and intramuscular changes [4]. Although there are many cardiovascular adaptation benefits from physical activity, there are still concerns about possible health effects, especially when engaging in vigorous or prolonged physical activity. Intensive training programs are associated with increased ventricular hypertrophy and other structural changes, which increases more concerns about the long-term effects and cardiovascular damage of maintaining high levels of exercise training [5]. Because echocardiography is non- invasive, accurate, and highly reproducible, it is an important method for assessing left ventricular function adaptation in track and field athletes.

prolonged physical activity. Intensive training programs are associated with increased ventricular hypertrophy and other structural changes, which increases more concerns about the long-term effects and cardiovascular damage of maintaining high levels of exercise training [5]. Because echocardiography is non- invasive, accurate, and highly reproducible, it is an important method for assessing left ventricular function adaptation in track and field athletes. It assesses heart pain, ventricular size, wall thickness, systolic and diastolic function and provides suggestions for long-term health management and performance improvement [6]. The purpose of the study was to discuss critically the effects of different types of track and field events on left ventricular functional adaptations of athletes based on the echocardiographic findings of other researchers i.e. a review study was conducted. Echocardiography and Sports In contemporary sports, echocardiography is essential for non-invasively evaluating cardiac shape and function, helping to differentiate between normal and pathological alterations in the heart of the athletes, and improving medical assessments [7]. Echocardiography is a diagnostic cardiac ultrasound procedure that uses high-frequency ultrasound technology to produce images of the heart. These images show information about the anatomy and physiology of the heart, such as size, shape, wall motion, and valve function [8]. An athlete’s left ventricular functional adaptation may be evaluated by echocardiographic screening; those who engage in endurance activity have the greatest dimensions and highest functionality, which are correlated with increased LV volume [9]. Before the development of new imaging techniques, the physiological consequences of cardiac adaptation in athletes were well documented. Morganroth and colleagues described the assessment of cardiac adaptation using current imaging techniques such as echocardiography to measure ventricular size and wall thickness [10]. According to Urhausen, et al. [11], sports activity, training volume, and body size should be considered when collecting ultrasound heart measurements in athletes. To evaluate the state and function of the athlete’s heart, multi-imaging techniques such as cardiac CT, cardiac MR, and complex echo technology were introduced in 2014. On the other hand, sensors Wearables, compact trackers, and implantable devices make monitoring easy during training and competition, it is easier to assess electrophysiological changes in athletes [12].

collecting ultrasound heart measurements in athletes. To evaluate the state and function of the athlete’s heart, multi-imaging techniques such as cardiac CT, cardiac MR, and complex echo technology were introduced in 2014. On the other hand, sensors Wearables, compact trackers, and implantable devices make monitoring easy during training and competition, it is easier to assess electrophysiological changes in athletes [12]. Left Ventricular Functional Adaptations Adaptation is the process by which physical and psychological functional systems respond to training loads. Getting used to stress will lead to improved performance. Through the adaptation process, athletes’ performance improves [13]. In sports, training adaptations refer to physiological and functional changes caused by physical training that are influenced by the amount of exercise, type of activity, and method. Adaptation involves a gradual increase in stress to maintain tissue overload and facilitate adaptation [14]. However, illness or injury can hamper the training program and require adjustments. Physiological adaptations are always specific to training and stress on the body. It is the adaptations that lead to improved performance after training. Adaptations in response to exercise include a decrease in resting heart rate, an increase in stroke volume and cardiac output, an increase in oxygen uptake, an increase in blood haemoglobin levels, muscle hypertrophy, and other changes in the muscles. These include a variety of changes: increased myoglobin, increased mitochondrial number, and increased aerobic fitness or use anaerobic enzymes depending on training specificity, increased lactate threshold, etc. [15]. Regular, intense physical training causes an increase in the mass, cavity size, and wall thickness of the left ventricle (LV), which is referred to as “athlete’s heart.” Depending on the type of exercise, strength, or endurance, these

Open Access Journal of Kinesiology and Sports Medicine 3Mukhopadhyay K, et al. Echocardiographic Insights into Left Ventricular Functional Adaptation in Track and Field Athletes: A Comprehensive Review. Open J of Kinesiology & sports Med 2024, 2(1): 000113. Copyright© Mukhopadhyay K, et al. modifications can vary in degree [16]. Male middle-distance runners have alterations in their adaptive body responses to exercise, including variations in blood haemoglobin concentration and functional capacity of the body [17]. Adolescent male track and field athletes have varying performance characteristics across different sports, with boys beginning in early adolescence to perform better than girls [18]. Exercise and training-induced modifications to left ventricular mass (LVM), end-diastolic volume (EDV), stroke volume (SV), heart rate and cardiac output, are all part of the process of left ventricular functional adaptation. Extended periods of high-intensity exercise regimens induce cardiac adaptations, which raise the LVM and cavity width and satisfy the requirements for left ventricular hypertrophy (LVH) [19]. Marsh, et al., [20] reported that the effects of various exercise modalities on cardiac adaptation vary; for example, resistance training (RES) does not increase LVM and end diastolic volume (EDV), but endurance training (ET) does. Men experience higher increases in left ventricular systolic volume (LVEDV) and SV as a result of ET, although LVM augmentation is equivalent in both sexes [21]. These results emphasize the significance of exercise duration, type, and intensity in influencing functional adaptations of the left ventricle. Cardiac muscles adjust functionally in response to sporting activity. These adaptations include alterations in left ventricular (LV) function during exercise, such as higher stroke index (SVI) and cardiac index (QI) in highly trained young athletes compared to their recreationally active contemporaries [19]. Diastolic function improves in young athletes during exercise, most likely because to improved preload determinants [22]. Aerobic training at a moderate level can contribute to left ventricular hypertrophy (LVH) by reducing the hemodynamic strain during daily activities [23]. Individuals with high aerobic fitness exhibit decreased LV strain at rest and during exercise, indicating improved systolic function [24]. SL No Study/Topic Name & Authors Objective Methods Findings 1 Left ventricular adaptations following short- term

preload determinants [22]. Aerobic training at a moderate level can contribute to left ventricular hypertrophy (LVH) by reducing the hemodynamic strain during daily activities [23]. Individuals with high aerobic fitness exhibit decreased LV strain at rest and during exercise, indicating improved systolic function [24]. SL No Study/Topic Name & Authors Objective Methods Findings 1 Left ventricular adaptations following short- term endurance training [25]. The study investigated the impact of short- term endurance training (ET) on left ventricular adaptation and functional response to exercise challenges. Eight untrained men were studied before and after 6 days of ET, which involved cycling 2 hours/day at 65% peak aerobic power. According to the study, brief exercise training raises exercise stroke volumes by improving heart rate, plasma volume, and Vo2max but not resting left ventricular function. 2 The impact of endurance exercise training on left ventricular systolic mechanics [26]. The study sought to evaluate LV systolic performance in competitive athletes before and after 90 days of EET, with an emphasis on tissue velocity, strain, and strain rate. The study looked at the impact of competitive athletics among Harvard University undergraduates on their heart health. Data was collected over a 90-day period, including endurance and strength workouts. The statistical analysis comprised paired t-tests, Wilcoxon matched pair tests, and correlation analysis. Exercise training (EET) lowers circumferential strain in left ventricular septal segments, probably due to ventricular interdependence. LV strain and tissue velocity are more sensitive measures of systolic adaptation. The study focuses on understanding EET-induced myocardial adaptation in healthy persons.

Open Access Journal of Kinesiology and Sports Medicine 4Mukhopadhyay K, et al. Echocardiographic Insights into Left Ventricular Functional Adaptation in Track and Field Athletes: A Comprehensive Review. Open J of Kinesiology & sports Med 2024, 2(1): 000113. Copyright© Mukhopadhyay K, et al. 3 Adaptation of heart to training: A comparative study using echocardiography & impedance cardiography in male & female athletes Yılmaz, et al. [16]. The purpose of the study is to assess how endurance training affects the hemodynamic parameters, left ventricular function, and heart shape of athletes, both male and female. Transthoracic echocardiography and impedance cardiography were performed on 79 healthy athletes and 82 healthy adolescents, 49% of whom were male, at the age of 20.0 ± 2.6 years. In comparison to inactive controls, endurance-trained male and female athletes had increased LV mass, LV cavity dimensions, and stroke volume. Male athletes’ resting heart rates were lower and their mean arterial blood pressure was greater. 4 Regular endurance training in adolescents impacts atrial and ventricular size and function [27]. The purpose of the study was to look at the relationship between maximum oxygen consumption and the effects of long-term endurance exercise on adolescent atrial and ventricular growth and function. A study measuring echocardiograms, Doppler investigations, and treadmill exercise VO2max was carried out with 27 endurance- trained teenagers between the ages of 13 and 19 and 27 controls. Adolescents who engaged in physical activity displayed greater heart dimensions and better systolic function in comparison to controls. This shows increased atrial and ventricular dimensions, as well as functional remodelling, in the heart as a result of prolonged endurance exercise. 5 Left ventricular remodeling and the athlete’s heart, irrespective of quality load training [28]. The study’s objective was to monitor, for a minimum of five years, the effects of physical training on the morphology and function of the heart in a group of elite rugby and soccer players. A total of 250 elite rugby and soccer players and 114 soccer players were studied between 1993 and 2015. Of them, 60 rugby and 78 soccer players were followed for five years and paired with

of five years, the effects of physical training on the morphology and function of the heart in a group of elite rugby and soccer players. A total of 250 elite rugby and soccer players and 114 soccer players were studied between 1993 and 2015. Of them, 60 rugby and 78 soccer players were followed for five years and paired with a control group. After a five-year follow-up, athletes’ LV dimensions and LVMi were considerably higher than those of inactive subjects’, but no significant changes in cardiac dimensions were noted. Frequent physical activity causes mild left ventricular hypertrophy, which is an adaptive response to stress-exercise. 6 The role of echocardiography in the evaluation of cardiac re- modelling and differentiation between physiological and pathological hypertrophy in teenagers engaged in competitive amateur sports [29]. This study aimed to identify cardiac re-modelling forms, differentiate between pathological and normal hypertrophy, and show left ventricular hypertrophy prevalence in sports- playing teens. Echocardiographic measures of athletes and control subjects were acquired using M-mode, two-dimensional, and Doppler methods. According to the study, cardiac re- modelling and left ventricular mass were considerably greater in healthy teens who played both dynamic and static sports. The prevalence of both forms of re-modelling was also higher. These results point to heart remodeling and physiological hypertrophy in sports.

Open Access Journal of Kinesiology and Sports Medicine 5Mukhopadhyay K, et al. Echocardiographic Insights into Left Ventricular Functional Adaptation in Track and Field Athletes: A Comprehensive Review. Open J of Kinesiology & sports Med 2024, 2(1): 000113. Copyright© Mukhopadhyay K, et al. 7 Assessment of myocardial function in elite athlete’s heart at rest - 2D speckle tracking echocardiography in Korean elite soccer players [30]. This study looked at the myocardial function of elite Korean soccer players by comparing the results with normal controls using both conventional and advanced speckle tracking imaging. The study used tissue Doppler, STI, and conventional echocardiography together with 2D echocardiography speckle tracking echocardiography to evaluate LV regional strain in 29 elite soccer players compared to 29 healthy controls. Soccer players exhibit distinct ventricular adaptation, including greater basal circumferential, apical radial, and apical circumferential strain, as well as higher rotation at the base and apex, which may help in cardiovascular adjustment to activity without major energy expenditure loss. 8 Left ventricular remodeling in elite and sub-elite road cyclists [31]. The purpose of this study was to use conventional and speckle tracking 2D echocardiography to characterize the mechanical, functional, and structural properties of left ventricular (LV) components in endurance athletes. Male elite road cyclists, sub-elite cyclists, and healthy non-athlete university students and staff participated in this cross- sectional study. Septal and lateral E’ velocities, larger global circumferential strain, lower ejection percentage, dilated eccentric hypertrophy, higher chamber concentricity, and stronger LV structural adaptability were all seen in elite cyclists (34.7%). While lower E and E’ velocities could suggest functional reserve in EC(Elite Cyclists), higher GCε might be a compensatory strategy to maintain stroke volume. 9 Ten-year follow- up of cardiac function and neural regulation in a group of amateur half- marathon runners. Assessing the medium- to long- term impacts of moderate-to-intense physical exercise on cardiovascular neuronal regulation, cardiac function, and the incidence of cardiovascular illnesses was the goal of this follow-up. To evaluate cardiovascular disease, neural control, and heart function, subjects received transthoracic echocardiography, physical exams, interviews, and standing tests. Middle-aged sportsmen who engaged in regular physical training during

half- marathon runners. Assessing the medium- to long- term impacts of moderate-to-intense physical exercise on cardiovascular neuronal regulation, cardiac function, and the incidence of cardiovascular illnesses was the goal of this follow-up. To evaluate cardiovascular disease, neural control, and heart function, subjects received transthoracic echocardiography, physical exams, interviews, and standing tests. Middle-aged sportsmen who engaged in regular physical training during a 10-year follow-up revealed normal echocardiographic measurements, a low incidence of cardiovascular disease, and decreased sympathetic and enhanced vagal modulation. 10 Training intensity influences left ventricular dimensions in young competitive athletes [32]. The purpose of the study was to assess how young competitive athletes’ heart muscles have changed structurally and functionally in response to training duration, intensity, and output. In the Munich Cardiovascular Adaptations in Young Athletes Study, which included 404 kids and teenagers, several tests were used to evaluate left ventricular anatomy, training intensity, aerobic capacity, and strength. The study demonstrates that, in spite of anatomical alterations and a reduction in diastolic function, cardiac adaptations to exercise happen early in life and are impacted by exercise intensity and maximal aerobic capacity.

Open Access Journal of Kinesiology and Sports Medicine 6Mukhopadhyay K, et al. Echocardiographic Insights into Left Ventricular Functional Adaptation in Track and Field Athletes: A Comprehensive Review. Open J of Kinesiology & sports Med 2024, 2(1): 000113. Copyright© Mukhopadhyay K, et al. 11 Concentric and Eccentric Remodelling of the Left Ventricle and Its Association to Function in the Male Athletes Heart: An Exploratory Study [33]. The study compared left ventricular (LV) functional parameters, peak strain and strain rate, and temporal strain and strain rate curves in 45 male athletes with concentric, eccentric, and normal LV geometry. Based on LV geometry, 45 elite male athletes between the ages of 18 and 35 were included in the research. They had a thorough cardiovascular evaluation that included 2DSTE, TTE, and ECG to measure global myocardial distortion. The study discovered that whereas normal left ventricular function is often linked with these remodeling patterns, concentric remodeling in athletes’ hearts raises ejection fraction (EF) and temporal myocardial strain. 12 Biventricular mechanical pattern of the athlete’s heart: comprehensive characterization using three- dimensional echocardiography [34]. This study aimed to characterize biventricular morphology and function in elite athletes using three- dimensional (3D) echocardiography. Athletes’ left ventricular and RV end-diastolic volumes (EDVi) and ejection fractions were found to be considerably greater than controls’ in a research including top athletes and healthy individuals. The reductions in LV GLS(Global Longitudinal Strains) and RV GCS(Global circumferential strains) brought on by exercise were greater. Athletes’ left ventricular and RV end- diastolic volumes (EDVi) and ejection fractions were found to be considerably greater than controls’ in a research including top athletes and healthy individuals. The reductions in LV GLS(Global Longitudinal Strains) and RV GCS (Global circumferential strains) brought on by exercise were greater. 13 Cardiac cycle timing intervals in university varsity athletes [35]. This study set out to characterize the contractility characteristics and cardiac cycle timing intervals in varsity athletes competing at the university level. In a study with 152 male and 93 female athletes, the researchers discovered that although men’s heart rates were lower, women’s isovolumic relaxation times, systolic times, and heart rates were