Elevated Resting Heart Rate is Associated with Dyslipidemia in Middle-aged and Elderly Chinese

Objective To study the relationship between resting heart rate and blood lipid level. Methods A total of 9 415 subjects aged≥40 years were included in the present study. Their resting heart rate was monitored and their serum levels of triglyceride （TG）, total cholesterol （TC）, low density lipoprotein cholesterol （LDL-C） and high density lipoprotein cholesterol （HDL-C） were measured to define dyslipidemia according to the 2007 Chinese Guidelines on Prevention and Treatment of Dyslipidemia in Adults. Results The subjects were divided into group A with their resting heart rate〈70 beats/min, group B with their resting heart rate=70-79 beats/min, group C with their resting heart rate=80-89 beats/min, and group D with their resting heart rate≥90 beats/min. High TG, TC, and LDL-C were presented across the resting heart rate （Ptrend〈0.01）. Multiple logistic regression analysis revealed that the risk of high TG and TC was higher in subjects with their resting heart rate≥90 beats/min than in those with their resting heart rate〈70 beats/min （OR=1.42;95%CI：1.16-1.74 and OR=1.33;95%CI：1.09-1.64, respectively）. Conclusion Elevated resting heart rate is associated with high TG and TC in middle-aged and elderly Chinese subjects.

Serum Calcium Level is Associated with Brachial-ankle Pulse Wave Velocity in Middle-aged and Elderly Chinese

Objective To study the relation between serum calcium level and elevated BaPWV in Chinese subjects. Methods The relation between serum calcium level and elevated BaPWV was studied in 9 615 subjects. The mean value of left and right BaPWV was analyzed. BaPWV was defined as high when it was31 752.5 cm/s （the upper quartile） either side. Results The BaPWV and its elevated percentage progressively increased across the quartiles of the serum calcium level （P〈0.05）. The prevalence of elevated BaPWV was significantly higher in subjects of the second, third and highest quartiles than in those of the lowest quartile （26.9%, 28.4%, and 33.2%vs 23.7%, P=0.0116, P=0.0004, and P〈0.0001）. Logistic regression analysis revealed that the risk of elevated BaPWV was 1.32- fold higher in subjects of the highest quartile than in those of the lowest quartile （OR=1.32, 95%CI：1.08-1.60）. Conclusion The elevated serum calcium level is related to an elevated BaPWV and a higher risk of arterial stiffness, independent of conventional risk factors, in middle-aged and elderly Chinese subjects.