Department of Psychology, Virginia State University, Petersburg, Virginia 23806, USA.
Ethn Dis. 2012 Spring;22(2):162-7.
The purpose of our study was to determine which measure of obesity is better at predicting cardiovascular risk in African Americans. We hypothesized that BMI alone would be significantly associated with cardiovascular reactivity. We also hypothesized that waist circumference alone would be significantly associated with cardiovascular reactivity. Lastly, we hypothesized that BMI and waist circumference together would be more associated with cardiovascular reactivity and account for more of the variance than the two measures alone.
BMI and waist circumference were measured in 105 African American college students (21 men and 84 women) aged 18-27. In addition, heart rate, cardiac output, stroke volume, and systolic and diastolic blood pressure were measured as the participants viewed a racially noxious scene on videotape.
BMI and waist circumference analyzed separately were significantly associated with stroke volume, cardiac output, and systolic blood pressure. These positive associations showed that heavier participants had higher systolic blood pressure and their hearts pumped out greater blood volume compared to their thinner counterparts. Body mass index also completely mediated the relationship between waist circumference and cardiovascular activity.
The findings may be attributed to the premise that the waist circumference standards are different for African Americans than for Whites. Future research should establish waist circumference thresholds that are better predictors of cardiovascular disease in African Americans.
本研究旨在确定衡量肥胖的哪种指标更能预测非裔美国人的心血管风险。我们假设 BMI 单独与心血管反应显著相关。我们还假设腰围单独与心血管反应显著相关。最后，我们假设 BMI 和腰围一起与心血管反应的相关性更高，并比两个单独的指标能更好地解释更多的变异。
105 名年龄在 18-27 岁的非裔美国大学生（21 名男性和 84 名女性）接受了 BMI 和腰围的测量。此外，当参与者观看录像带上的种族有害场景时，还测量了心率、心输出量、每搏输出量以及收缩压和舒张压。
单独分析的 BMI 和腰围与每搏输出量、心输出量和收缩压显著相关。这些正相关表明，与较瘦的参与者相比，较重的参与者的收缩压更高，心脏泵出的血液量更大。体重指数也完全介导了腰围与心血管活动之间的关系。
这些发现可能归因于这样一个前提，即非裔美国人的腰围标准与白人不同。未来的研究应该建立更好地预测非裔美国人心血管疾病的腰围阈值。
