Enhancement of VO2Max Through Structured Circuit Training in Adolescent Male Futsal Athletes

Abstract

This study aimed to evaluate the effect of a six-week circuit training program on VO2Max levels among U-16 futsal athletes from the Opel Futsal Club in Lamongan Regency. A one-group pretest-posttest design was employed, involving 20 male athletes who underwent an 18-session circuit training intervention. VO2Max was measured using a standardized Bruce protocol with a metabolic analyzer. Descriptive statistics showed an increase in mean VO2Max from 39.29 ml/kg/min (pretest) to 43.93 ml/kg/min (posttest). The Shapiro-Wilk test confirmed normal data distribution (p > 0.05), and a paired samples t-test revealed a statistically significant improvement (t = -8.076, p < 0.001). These findings indicate that structured circuit training effectively enhances aerobic capacity in youth futsal players. The results support the integration of circuit training into regular conditioning programs to improve cardiovascular endurance. This study suggests that multi-component training can be a valuable strategy for developing physical fitness in adolescent athletes.