<![CDATA[Trail running has physiological characteristics that differ from conventional running due to variations in elevation and unstable terrain. This study aimed to analyze the relationships between vital lung capacity, leg muscle power, and VO₂max in trail running athletes. A cross-sectional correlational design was used with 60 trail running athletes from clubs in Bandung, selected through purposive sampling. Vital lung capacity was measured using a spirometer, leg muscle power using the vertical jump test, and VO₂max using the 15-minute Balke test. Data were analyzed using Pearson correlation and multiple linear regression. Vital lung capacity showed a very strong positive relationship with VO₂max (r = 0.904; p < 0.001), while leg muscle power showed a strong positive relationship with VO₂max (r = 0.801; p < 0.001). Both variables were simultaneously and significantly associated with VO₂max (F(2,57) = 142.019; p < 0.001; R² = 0.833). These findings indicate an association between respiratory capacity, lower-limb neuromuscular capacity, and aerobic capacity in trail running athletes. The cross-sectional design limits the interpretation of the findings to associations between variables and does not establish causal relationships.]]>
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