Introduction: Early positioning in altitude increases hypoxia and Oxygen pressure reduction, hypoxia level inducing factor and vascular endothelial growth factor in skeletal and cardiac muscle and causes adaptation in athletes as function improvement and their better record in sea level. This study purpose is Comparing effects of ascent to three thousand meter altitude with three different intensity on Vo2max and body composition in amateur male and female mountaineers. Methodology: This semi-experimented research was done on 60 amateur male mountaineers with 25 to 26 years old mean, 57 to 72 KG weight, 22 to 25 KG/m2 BMI and 40 to 45 mL/Kg/min Vo2max. Subjects ascended to 3 thousand altitude Salvak mountaintop with three different intensity of maximum heart rate(60-70-80), 12.45±5.86% gradient, 9.74±4.54°C and 36.91±5.10% humidity and 761±39.04 mmHg barometric pressure in three female experimental groups (n=3*10) and three male experimental groups (n=3*10). Bloodletting and statistical data was measured in three stages, before ascending, immediately after ascending to altitude, 2 hours after residence in three thousand altitudes. One way ANOVA was used along repeated measurements with significance level (0/05) for data analysis. Results: Study the results showed changes in mountaineer's body composition but Vo2 max was observed insignificant in three male groups. Discussion: According to recent project results, it seems that acceding to three thousand altitudes with definite intensity caused Vo2maxincreasing in addition to energy economic consumption and at last athletes function improvement.

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