The Clinical journal of pain
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The present study aimed to: (1) better understand physical activity levels in youth with chronic abdominal pain and (2) investigate the relationship between day-level physical activity related to next day pain intensity to identify any intraindividual heterogeneity. ⋯ The current study highlights the importance of separating between-person and within-person differences when examining the relationship between physical activity and pain severity. Future studies should explore moderating factors that may help to explain random effects to better understand the types of individuals with positive or negative relationships between physical activity and pain severity.