Purpose: In a soccer game, a VO2max of 60 ml/kg/min has been suggested as the minimum fitness requirement for male soccer players to play at elite level. While the average maximal oxygen intake for elite adult players are reported to be in the range of 55 to 69 ml/kg/min. Although to predict the effective endurance training to improve maximal oxygen uptake, recent research confirmed obesity in terms of Fat percentage is a better parameter than BMI for the prediction of low VO2max. On its scientific basis, our aims are to test BMI VS BFP as a relation to estimate players’ physiological soccer adaptation profile. Methods: to archive this objective, 148 well-trained first division soccer players under 18 years, at the end of the preparatory phase before the start of the Algerian championship 2016-2017, took part in the study. Split into two groups based on their V02max under or superior to 56 ml/kg/min. As a protocol, based on the validity of Test Cooper to predict VO2max in the field. Acceptable by cooper institute as an index of physiological training response or as indicators of current training status. Results: our results show in general that VO2max is acceptable indicators of current training status. In the benefits of up to≥ 56 ml/kg/min then it’s less. Claim in the present through physiological soccer adaptation profile more related to obesity in terms of Fat percentage as a better parameter than BMI for the prediction of low VO2max among players under 18years. Conclusions: our protocol admits that training response in soccer game requests the use of more accurate systems, such as body fat percentage (BFP) as a relation with VO2max to estimate …