Background and objectives: Finding an appropriate method for measuring maximum aerobic power (or maximal oxygen consumption, VO2max) and replacing this method with conventional maximal exercise tests to obtain VO2max can be useful in many cases. The measurement of cardiorespiratory functional capacity has always been of great importance to both normal people and elite athletes. The cardiorespiratory system is one of the determinants of health and should be kept wholesome by people to maintain their well-being. Accordingly, the present study was conducted to design the allometric equations special for Iranian men to assist in the accurate assessment of VO2max in individuals without the need for maximal exercise tests. Materials and methods: This experimental and correlational research was conducted on 44 Iranian male volunteers aged 18-25 years with mean age of 20.5 ± 1.73 years, mean weight of 71.6 ± 10.84 kg and mean height of 176 ± 6.3 cm. After calculating the anthropometric characteristics of the subjects, their VO2max index was measured using the direct measurement of respiratory gases for designing the allometric equations with the aid of regression analysis. Results: The findings showed that there is a relatively good relationship between the designed allometric equations (VO2max=1.04×weight0.03, VO2max=-0.55×(Body Surface Area) BSA1.84, VO2max=0.83×(Lean Body Mass) LBM0.05) and the direct measurement of respiratory gases (SEE=0.31-0.32 R=0.67-0.70), and we can use these equations with great confidence to measure VO2max. Conclusion: Considering that the VO2max measurement is of particular importance to individuals, we have been able to assess the VO2max using allometric equations designed for Iranian men with a fairly good validity and that since the VO2max measurement of individuals without the need to perform the maximal exercise tests can be useful in many situations, so it is recommended to use our allometric equations designed for Iranian men to measure
