نبذة مختصرة : Background: Physical activity (PA) plays a crucial role in the overall well-being of children in the long term. The present study aimed to investigate the correlation between PA, sedentary behavior (SB), and body composition (BC) among primary school children.Methods: This descriptive-correlational study was conducted in Ali-Abad-Katoul, Iran in 2023. A sample size of 322 boys was selected using convenience sampling method. ActiGraph wGT3X-BT accelerometer and Body Composition X-Scan Plus II were used for measuring PA pattern and BC. Pearson correlation and Independent t tests were used to analyze the data.Results: The accelerometer data revealed that participants spent 67.55% of the total time in SB. Moreover, on average, daily moderate-to-vigorous physical activity (MVPA) was 49.71±22.37 minutes. Accordingly, the daily energy expenditure was 558.39±250.17 kcal. SB was directly and significantly associated with Body Mass Index (BMI) (r=0.628, P
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