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Abstract

This study examined age-related differences in cardiorespiratory endurance among school-going girls aged 9, 10, and 11 years.A total of 1,500 students (500 from each age group) from DAV schools in Delhi NCR participated.The one-mile run/walk test is a common method used to assess cardiorespiratory endurance.The results demonstrated a clear improvement in performance with age: the average completion times were 14.68 minutes for 9-year-olds, 13.10 minutes for 10-year-olds, and 12.30 minutes for 11-year-olds.There were significant difference obtained between age groups (p< 0.001), and posthoc analysis confirmed significant performance differences across all groups.The study concludes that cardiorespiratory endurance increases with age in this cohort, offering a baseline for tracking cardiovascular fitness enhancement and emphasizing the importance of encouraging physical activity during early childhood.