Research On Monitoring And Evaluation Of Cardiac Reserves Based On Heart Sound

Cardiac reserve(cardiac reserve,CR)is the ability to upregulate heart function,objective and specific quantification reflects the human heart potential.Cardiac reserve capacity includes systolic reserve,heart rate reserve,and diastolic reserve.The size of the heart reserve capacity can determine whether you can safely withstand the daily activities of life,such as: intense sports,military training,various diseases,plateau life and so on.The cardiac reserve is shown in the dynamic state of the heart state.Everyone in the movement inside and outside the environment changes at the same time,the heart’s own state will also change,will use the heart reserve to adapt to the changes in the external environment.For example,athletes in the high-intensity,long-term special training,their own individuals will use the heart rate reserve(HRR),heart rate will be raised from resting to 2-3 times when resting,while training Will continue to use myocardial contractility reserve(CCR),myocardial capacity may be raised 10 times.The whole state of the heart it contains the awake phase and the recovery process,the state of the heart in the high-intensity training in the physiological compensation will make the heart fatigue,or even injury.The ratio of the first heart sound amplitude to the second heartbeat amplitude(S1 / S2),diastolic period to the systolic time limit ratio(D / S)is defined as the heart rate monitoring method.The heart reserve capacity test is based on noninvasive monitoring of the heart-heart relationship,allowing athletes,regular college students,soldiers and patients to understand the impact of the disease on the heart or damage,to provide them with more protection of the heart.(1)The college students were divided into two groups: the first group included 125 PE students,with an average age of 21.7 ± 2.0,including 81 males and 44 females;the second group was 155 general faculties College students,the average age of 20.5 ± 2.6,of which 64 males and 91 females.The rate of resting heart rate is 78 ± 12.8,the heart rate of college students is lower than that of ordinary college students.The average college students’ resting rate is D / S1.63 ± 0.31,the students of physical education are 1.98 ± 0.35(P <0.05).The D / S of college students and general college students decreased significantly to 1.02 ± 0.24 and 0.97 ± 0.18,respectively,under the total exercise amount.(2)The S1 / S2 ratio is 1.28 ± 0.47,and the first stage S1 / S2 ratio is 1.58 ± 0.64,which is higher than that of resting state S1 / S2,and the second The ratio of S1 / S2 in the fifth stage is 1.38 ± 0.74,and the amplitude of S1 / S2 is 1.34 ± 0.48 in the final recovery stage.D / S in the rest of the state before the departure of 1.96 ± 0.39,followed by the distance D / S gradually reduced;female soldiers resting state S1 / S2 ratio of 1.25 ± 0.26,the first phase of the S1 / S2 amplitude has increased 1.38 ± 0.67,The final recovery phase S1 / S2 and resting state S1 / S2 flat.D / S before the departure of the resting state of 1.89 ± 0.24,after the start of the first to fourth stage D / S continued to decline,high-intensity exercise led to inadequate cardiac insufficiency,the fifth stage of the body function of soldiers to adapt to high-load movement,D / S returns to the reference state.On the way to rest day D / S returned to 2.02 ± 0.37.(3)The S1 / S2 ratio of the subjects with hypertension was 3.44 ± 2.59 and the D / S ratio was 1.48 ± 0.28.The S1 / S2 ratio of subjects was 2.43 ± 0.63 and the ratio of D / S was 1.51 ± 0.20.The S1 / S2 ratio of subjects with high blood pressure was much higher than that of subjects without hypertension.