<![CDATA[Core muscle fatigue may impair postural control, particularly in futsal, which requires repeated changes of direction and single-leg support. This study aimed to analyze the effect of abdominal core muscle fatigue on balance in futsal athletes who were students of Sports Science at Universitas Pendidikan Indonesia. A quantitative approach with a quasi-experimental one-group pretest-posttest design was employed. Twelve university students who actively played futsal were selected using purposive sampling. Core muscle fatigue was induced through continuous sit-ups until muscle failure, while balance was assessed using a force plate through center of pressure (COP) parameters before and immediately after the treatment. Data were analyzed using the Shapiro-Wilk test, followed by a paired-sample t-test or Wilcoxon signed-rank test according to data distribution. All COP parameters increased following fatigue. At the nominal significance level, differences were found in COP Range mediolateral (ML) (p = 0.015; d = 0.83), COP Velocity ML (p = 0.001; d = 1.26), and COP SD ML (p = 0.010; d = 0.89), while the AP parameters and COP Area 95% increased but were not significant. After Bonferroni correction, only COP Velocity ML remained statistically significant. The findings indicate that core muscle fatigue was primarily associated with changes in postural control in the ML direction. These findings support the importance of core endurance training, including lateral stabilization, in futsal training programs.]]>
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