The Study Of Heart Rate Variability To Head-up Tilt Test Of Middle-aged People

Objective: This paper measures the changes in the rate,blood pressure and heart rate of the test center in a 45-year-old middle-aged person aged 45-59 years in Beijing,and evaluates the vascular and vascular vagus nerves in the middle-aged population.The regulation of reflexes explores the intrinsic link between different cardiovascular risk levels and autonomic function.Methods: A total of 48 middle-aged people aged 45-59 years in Beijing,including 24 males and 24 females,were randomly selected according to the American College of Sports Medicine(ACSM)for risk factors for atherosclerotic cardiovascular disease.The stratification method is divided into low-risk group,intermediate-risk group and high-risk group.Blood pressure was recorded with a blood pressure meter,and heart rate variability was recorded with a polar meter.The subjects were placed flat on an electric erect bed inclined bed.After 5 minutes of quiet lying,the inclined bed was tilted by 60°,and heart rate,blood pressure,and heart rate variability were recorded every 5 minutes until the test was terminated by 25 minutes.Results:(1)During the upright tilt test from quiet state to 25 minutes,the heart rate of each group increased with time,male and female increase respectively 4.71±2.20 and 6.58±2.20 time/minute,and there was no significant difference between male in each time period(P>0.05);female The heart rate was significantly higher in the high-risk group than in the low-risk group at the end of 15 minutes and at the end of 20 minutes(P>0.05);Systolic blood pressure no significant change,Diastolic blood pressure increase 5.17±3.53 mm Hg、6.46±3.32 mm Hg.(2)There was a significant difference in the heart rate between the high-risk group and the heart rate when the patient was tilted for 5 minutes,tilted for 10 minutes, tilted for 15 minutes,tilted for 20 minutes,and tilted for 25 minutes(P<0.05).(3)Within 5 minutes of quiet supine,LFnorm was significantly higher in male highrisk group than in low-risk group(P<0.05),and HFnorm was significantly lower than low-risk group(P<0.05).(4)The LFnorm of the male low-risk group was significantly increased(P<0.05)when tilted for 5 minutes,tilted for 10 minutes,tilted for 20 minutes,and tilted for 25 minutes(P<0.05);the male-risk group LFnorm was tilted for 10 minutes.Tilting for 20 minutes and tilting for 25 minutes showed a significant increase(P < 0.05)compared with when lying quietly.Conclusions:(1)There is a certain degree of cardiovascular regulation dysfunction in the high cardiovascular risk group in the middle-aged population aged 45-59 years when the passive position changes.(2)The group of high cardiovascular risk factors in the middle-aged population aged 45-59 years,the autonomic regulation ability was weak after the transition from the supine position to the standing position,and the male had abnormal autonomic nerve activity in the quiet state,mainly characterized by the weakened vagus nerve function.The sympathetic function is enhanced,suggesting that the increase in cardiovascular risk is significantly associated with heart rate variability.