Body fat percentage (BF%) determined by bioelectrical impedance analysis is widely used at home and in medical check-ups. However, the clinical significance of measuring BF% has not been studied in detail.
Methods and results:
A cross-sectional study was carried out on a cohort of 10,774 middle-aged Japanese men who had undergone an annual check-up in 2008. Cut-off points were evaluated for body mass index (BMI), waist circumference (WC), and BF% for detecting participants with cardiovascular disease (CVD) risk factors (diabetes mellitus, hypertension, dyslipidemia), and effectiveness compared for each marker's cut-off point. Additionally, the effects of smoking on cut-off points were evaluated. The cut-off points of BMI, WC, and BF% for detecting participants with 1 or more CVD risk factors were 22.7kg/m(2), 81.4cm, and 20.3%, respectively. The cut-off points of BF% for 1 or more CVD risk factors classified 3.43% more subjects into correct categories than those of BMI (P<0.001). The cut-off points of BMI, WC, and BF% for detecting individuals with 3 CVD risk factors in current smokers were 24.9kg/m(2), 87.8cm, and 23.7%, while those in non-smokers were 23.3kg/m(2), 83.9cm, and 22.3%, respectively.
BF% could be more effective in detecting individuals with early stage CVD risk accumulation than BMI. The cut-off points for current smokers were lower than those for non-smokers in all markers.
"Park et al.23), reported that an increase in WHR was associated with high BP in Korean adults (2,327 men, 3,102 women) aged 20 years or older. Yamashita et al.24), reported that %BF could be more effective in detecting individuals with early stage CVD (diabetes mellitus, hypertension, and dyslipidemia) risk accumulation than BMI in 10,774 middle-aged Japanese men. "
[Show abstract][Hide abstract] ABSTRACT: Obesity is an important risk factor for hypertension in adolescents. We investigated the relationship of obesity-related indices (body mass index [BMI], waist-to-height ratio [WHR], and body fat percentage [%BF]) with blood pressure and the hemodynamic determinants of blood pressure in Korean adolescents.
In 2008, 565 adolescents, aged 12-16 years, were examined. The %BF of the participants was measured by bioelectrical impedance analysis. Echocardiography and brachial artery pulse tracing were used to estimate the stroke volume (SV), cardiac output (CO), total vascular resistance (TVR), and total arterial compliance (TAC).
We noted that BMI, WHR, and %BF were positively correlated with systolic blood pressure (SBP) and diastolic blood pressure (DBP). The positive correlation between BMI and blood pressure (SBP and DBP) persisted after adjustment for WHR and %BF. However, after adjustment for BMI, the positive associations between blood pressure (SBP and DBP) and WHR as well as %BF, were not noted. With regard to the hemodynamic factors, BMI, but not WHR and %BF, was an independent positive factor correlated with SV and CO. TVR had an independent negative association with BMI; however, it was not associated with WHR or %BF. Moreover, we noted that BMI, WHR, and %BF did not affect TAC.
In Korean adolescents, BMI had an independent positive correlation with SBP and DBP, possibly because of its effects on SV, CO, and TVR. WHR and %BF are believed to indirectly affect SBP and DBP through changes in BMI.
Korean Journal of Pediatrics 12/2013; 56(12):526-33. DOI:10.3345/kjp.2013.56.12.526
[Show abstract][Hide abstract] ABSTRACT: Background
This study aimed at investigating the association between body mass index (BMI) and the timing of permanent tooth emergence in Jordanian children and adolescents.
A total of 2,498 Jordanian schoolchildren and adolescents aged 4–16 years were examined for permanent tooth emergence. The BMI was used to classify the subjects into 4 groups: underweight, normal weight, overweight and obese. Probit analysis was used to determine the median age at emergence of each tooth and BMI was used as a factor variable to detect statistically significant differences in the times of tooth emergence within pairs of BMI groups. In addition, binary logistic regression was used to assess the contribution of BMI grouping to the prediction of early emergence for each tooth.
It was found that permanent teeth especially canines, premolars and second molars tended to emerge earlier in children with higher BMIs and later in children with lower BMIs.
This study showed a significant and positive relationship between BMI and earlier emergence of permanent teeth, especially phase II mixed dentition permanent teeth. These findings could be relevant in managing children with varying BMIs in the fields of orthodontics, pediatric and forensic dentistry.
international journal of stomatology & occlusion medicine 06/2013; 6(2). DOI:10.1007/s12548-013-0075-x
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