Introduction: This study focuses on the relationship between physiological variables and individual maximal aerobic capacity by measuring heart and lung function in U-15 male soccer players. In addition, the study includes the relationship between heart rate deflection and lactate threshold and the maximal oxygen uptake during incremental exercise test, which may be a feasible monitoring tool during training. It may also provide a theoretical scientific basis for athlete selection as well as selection of appropriate training for elite juvenile male soccer players.
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