Relationship between body mass index and exercise blood pressure

Objective:To study changes of exercise blood pressure of patients with different body mass index(BMI) when undergoing treadmill stress test.Methods:A total of 224 patients with normal BMI(normal control group) and 109 obese patients(obesity group) underwent treadmill stress test.Exercise blood pressure was compared between the two groups,and relationship between BMI and exercise blood pressure was also analyzed.Results:Compared with normal control group,resting blood pressure [systolic blood pressure(SBP),diastolic blood pressure(DBP)],peak blood pressure(SBP,DBP) during exercise,blood pressure(SBP,DBP) and pulse pressure during recovery period significantly increased in obesity group(P0.05 all).Incidence rate of exercise hypertension in obesity group was significantly higher than that of normal control group(9.2% vs.3.6%,P0.05).Linear correlation analysis showed that BMI was significantly positive correlation with exercise blood pressure(r=0.123~0.205,P0.05).Conclusion:Change of exercise blood pressure is abnormal in obese patients,suggesting that vasomotor dysfunction and cardiac autonomic nervous dysfunction exist in obese patients.