<![CDATA[The purpose of the study. This study aimed to analyze and standardize lower-limb explosive power and maximal oxygen uptake (VO₂max) in male volleyball athletes aged 17–21 years in East Java, Indonesia, in order to establish normative reference values for athlete selection, performance evaluation, and training program development. Materials and methods. This study employed a descriptive quantitative research design involving 50 male volleyball athletes recruited from regional training centers and sports senior high schools in East Java. Lower-limb explosive power was assessed using the Standing Board Jump Test, while VO₂max was estimated using the Multistage Fitness Test (beep test). Data were analyzed using descriptive statistics (mean, standard deviation, minimum, and maximum), normality testing (Kolmogorov–Smirnov), and norm-referenced classification based on mean ± SD intervals using IBM SPSS Statistics. Results. The results showed that lower-limb explosive power ranged from 2.19 to 2.82 m (mean ± SD: 2.54 ± 0.13 m), while VO₂max ranged from 29.9 to 53.3 ml·kg⁻¹·min⁻¹ (mean ± SD: 38.28 ± 3.67 ml·kg⁻¹·min⁻¹). A five-tier norm classification system (Very Good, Good, Moderate, Poor, Very Poor) was successfully developed. The Moderate category was identified as the minimum performance standard, with values of 2.48–2.60 m for explosive power and 36.45–40.11 ml·kg⁻¹·min⁻¹ for VO₂max. Conclusions. This study provides standardized normative values for lower-limb explosive power and VO₂max in adolescent male volleyball athletes, offering an evidence-based framework for athlete selection, physical readiness assessment, and performance monitoring. These findings can support the development of more effective and objective training and talent identification systems in volleyball.]]>
