Relationships Between the Body Mass Index and Body Composition on Physical Education Teacher
Firmansyah Dlis (a)*, Aridhotul Haqiyah (b)

(a) Universitas Negeri Jakarta, Jl. Pemuda No.28, RT.7/RW.14, Rawamangun, Kec. Pulo Gadung, Kota Jakarta Timur, Daerah Khusus Ibukota Jakarta 13220, Indonesia
*firmansyahdlis19[at]gmail.com
(b) Universitas Islam 45, Jl. Cut Mutia No.83, Margahayu, Kec. Bekasi Tim., Kota Bks, Jawa Barat 17113, Indonesia

Abstract

The purpose of this study was to analyze the Body Mass Index (BMI) (weight/stature2) as a proxy for percent body fat (%BF) and its relationship with fat-free mass (FFM). Multivariate analysis of variance and partial correlations were used to investigate the relations between BMI, %BF, and FFM for 54 male and 6 female physical education teachers with ranging in age from 26 to 62 years. Data were analyzed by using multiple logistic regression and cross tab. Sensitivity/specificity studies employed BMI cut-offs of 28 kg/m2 in males and 26 kg/m2 in females, and %BF cut-offs of 25% in males and 33% in females. When obesity was assessed by %BF, BMI properly identified around 30% of obese males and 8.3% of obese females. BMI is an unreliable indicator of obesity. According to the results of Receiver Operator Characteristic (ROC) studies utilizing %BF and total body fat, a BMI of 25 kg/m2 in males and 23 kg/m2 in females is a diagnostic screening cut-off for obesity.

Keywords: Body Mass Index, Body Composition, Fat-Free Mass, Body Fat

Topic: Sports medicine and health sciences