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The aim of this study was to investigate the effect of maturity level and body composition on the validity of allometric equations of VO2peak in obese and non-obese girls. 80 girls aged between 12 and 17 were randomly selected from schools in Hamedan city and divided into two groups: overweight-obese (BMI>85%) and normal (BMI<85%). Their biological age was determined by dental age method. VO2peak was assessed by Cureton test and allometric equations of Milano and Beunen. Pearson correlation and Bland–Altman methods were used to determine the validity. VO2peak was significantly different among three methods (P<0.01(. With the intervention of maturity, mean of VO2peak was not significantly different (P>0.05(. Validity of practical capacity in the obese adolescent girls with normal puberty was considerable (r =0.92, P<0.01). According to the SE values, Milano allometric equation had more accuracy to predict VO2peak in obese adolescent girls with normal maturation and non-obese subjects. Bland–Altman method showed a high agreement between the VO2peak of Cureton test and the allometric equation with a coefficient of 0.59. Validity of practical capacity in the obese subjects with abnormal maturation was significant (r=0.82, P<0.01); it was r =0.94, Pr =0.80, P2peak can be used to assess the level of cardiorespiratory fitness in adolescent girls.


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