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Purpose: Allometric is a method for the expression of relationship between the physiological variables, anatomical with unit of the body size that through mathematical methods can calculate vital capacity. The aim of this study was to evaluation of pulmonary function for estimation of peak oxygen consumption through the respiratory gas analysis and allometric equation in boy student. Methods: In this causal after the occurrence study, 80 subjects were selected by convenience sampling. Characteristics of anthropometric, chest circumference (diameter and depth of the chest), and for estimation of peak oxygen consumption, Bruce test, where was measured using the validated methods. Data were analyzed using Pearson correlation and multiple regressions in SPSS version 16. Result: There were not significant correlations between TV, IRV, ERV, and FVC with peak oxygen consumption. While, There was significant positive correlation between FVC and peak oxygen consumption (p=0.041 & r=0.229) and between amount of FVC of system with FVC of formula (p=0.00 & r=1.00). A significant correlation between FVC and peak oxygen consumption. According to this result the following model was developed: Vo2max= a+(1.761*FVC)+(0.319*age)+(0.284* chest circumference).Conclusion: The results indicated that There was significant positive correlation between amount of FVC of system with FVC of formula. Therefore, it can be concluded that to gain awareness of maximal oxygen uptake, in the absence of other laboratory methods, can be used allometric equation
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