Normal Body Mass Index and Heart Rate Variability

Abstract

The autonomic nervous system (ANS) works in synergy with the Endocrine system that affects the body-mass and height and in turn the body mass index (BMI). The ANS activities are often assessed with one index that is heart rate variability (HRV). Reduced HRV has been reported in underweight (low BMI) and overweight (high BMI) individuals, but there is scarce information available on the relationship between normal BMI and HRV. Further, as per WHO expert consultation report, the Asian population has higher percentage of body fat than their European counterparts, therefore Asian people may have greater risk factors for type 2 diabetes and cardiovascular disease even below the existing upper edge of normal BMI. Thus it was recommended by WHO to consider the intermediate cutoff points within the normal BMI range as 18.5 Kg/m2, 20 Kg/m2, 23 Kg/m2, and 25 Kg/m2 for the Asian population. Therefore, the present study was aimed to investigate ANS activity among intermediate cutoff points of normal BMI using HRV. Seventy young individuals participated in the non-invasive and benign study. Subjects were divided into three groups based on their BMI as per the recommendation of the WHO report; NB1 (18.5

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身体质量指数和心率变异性正常

自主神经系统（ANS）与内分泌系统协同工作，内分泌系统影响体重和身高，进而影响体重指数（BMI）。ANS活动通常用一个指标来评估，即心率变异性（HRV）。据报道，体重不足（低BMI）和超重（高BMI）的人的HRV降低，但关于正常BMI和HRV之间的关系，目前缺乏可用的信息。此外，根据世界卫生组织专家咨询报告，亚洲人群的体脂百分比高于欧洲人群，因此，即使低于现有的正常BMI上限，亚洲人患2型糖尿病和心血管疾病的风险因素也可能更大。因此，世界卫生组织建议将亚洲人群正常BMI范围内的中间临界点考虑为18.5 Kg/m2、20 Kg/m2、23 Kg/m2和25 Kg/m2。因此，本研究旨在使用HRV调查正常BMI中间临界点的ANS活性。70名年轻人参与了这项非侵入性良性研究。根据世界卫生组织报告的建议，受试者根据BMI分为三组；NB1（18.5

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