Neighbourhood environment and cardiorespiratory fitness in youth: A cross-sectional random forest analysis.

Neighbourhood features modestly predict youth cardiorespiratory fitness, explaining up to 61.2% of variance in VO2 peak/kg in a Montreal cohort.

• Why it matters: Understanding environmental influences on youth CRF is crucial for developing targeted interventions to reduce early cardiovascular risk, yet their specific contribution remains unclear.
• What they did: Using data from 504 children aged 8-10, the study applied random forest modeling to assess how neighbourhood features, alongside individual factors like BMI, sex, and physical activity, predict CRF.
• The result: Neighbourhood variables added about 5.7% to the explained variance, indicating a modest but notable environmental influence, and highlighting the need for further longitudinal research.