Abstract
ABSTRACT Introduction: Improving cardiovascular function is one of the main training goals of many sports. Objective: To understand the characteristics of the cardiovascular response of athletes under different training conditions. Methods: Thirty male basketball students were enrolled. The subjects were divided into A and B groups according to their years of training, with 15 students in each group. Exercise fatigue tests were performed, starting at a low intensity and gradually increasing the load to a relatively high degree of fatigue. Results: The RMSSD value was 42.82±31.41ms in group A and 46.48±35.26ms in group B undera low fatigue state. The LF/HF value of the athletes in group A was 2.86±1.47 and the LF/HF value of the athletes in group B was 2.94±1.68. The RMSSD value was 40.78±31.17ms and 32.37±36.42ms for groups A and B, respectively, undera high fatigue state. Conclusions: Athletes with more years of training can mobilize more cardiac reserves to meet the increase in exercise load in a fatigue state and have better autonomic nervous regulation in the process of reaching a higher degree of fatigue state. Level of evidence II; Therapeutic studies - investigation of treatment results.
Highlights
Improving cardiovascular function is one of the main training goals of many sports
According to independent sample T test, the comparison of RMSSD value of group A in the state of low fatigue with that of group B athletes in the state of low fatigue is as follows: P=0.694, P values>0.05. This indicates that the RMSSD value of group A under low fatigue state has no significant difference with that of group B under low fatigue state.[8]
There was no significant difference in the heart rate variability (RMSSD) between group A and group A during the process of reaching A lower degree of fatigue, before exercise, RMSSD in group A was significantly lower than that in group B, indicating that parasympathetic nerve activity in group B was significantly lower after exercise than before exercise
Summary
Improving cardiovascular function is one of the main training goals of many sports. Objective: To understand the characteristics of the cardiovascular response of athletes under different training conditions. Subaltitude hypoxia training is one of the ways to improve the athletes’ physical working ability and stimulate their physical movement function.[1] According to the training monitoring data, the effects of targeted training on athletes’body function system state in the sub-plateau and plain areas can be evaluated.[2] The training degree of athletes can be objectively evaluated by monitoring biochemical indicators, monitoring the state of cardiovascular system (the method of analyzing cardiac rhythm variation), testing the body’s working ability under graded loads, and evaluating the body’s energy supply effect and maximum energy supply possibility.[3] To master the characteristics of the adaptive changes of athletes’ heart function to long-term training and the stress changes to different loads, it has very important theoretical and practical significance for sports material selection, evaluation of training effects and improvement of training methods.[4] To address this research problem, Visnes H et al pointed out in a comparative study of heart rate variability in basketball and football college athletes that, long-term systematic training can effectively improve cardiac autonomic nerve regulation by taking into account various indicators in time and frequency domains, it is manifested as decreased heart rate in quiet state, prolonged R-R interval, and improved vagus nerve function.[5] Jin-young A N et al believed that long-term endurance training can increase the oxidative phosphorylation ability of muscle, increase the density of mitochondria, aerobic enzyme activity increased, capillaries and myoglobin increased. The changes in physiological adaptation mentioned above will result in the increase of ATP provided by mitochondrial aerobic oxidation.[6]
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