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Association between Objectively measured Physical Activity and Sedentary Behavior with Body Composition among Primary
Masoud Shakki1, Reza Rezaeeshirazi1, Neda Aghaei Bahmanbeglou1
1Department of Physical Education and Sport Sciences, Aliabad Katoul Branch, Islamic Azad University, Aliabad Katoul, Iran.
International Journal of School Health
|July 28, 2026
Summary
Children’s physical activity (PA) and sedentary behavior (SB) significantly impact body composition. Higher moderate-to-vigorous physical activity (MVPA) is linked to lower BMI and body fat, emphasizing the need for increased activity and reduced SB.
Area of Science:
- Pediatric Health
- Exercise Physiology
- Childhood Obesity
Background:
- Physical activity (PA) is vital for children's long-term health and well-being.
- Sedentary behavior (SB) and PA patterns are key determinants of body composition (BC).
Purpose of the Study:
- To investigate the correlation between PA, SB, and BC in primary school children.
- To understand how PA and SB influence body composition metrics like BMI and body fat.
Main Methods:
- A descriptive-correlational study involving 322 primary school boys in Iran.
- Objective measurement of PA and BC using accelerometers and body composition analyzers.
- Statistical analysis including Pearson correlation and Independent t tests.
Main Results:
- Children spent 67.55% of their time in SB, with average moderate-to-vigorous physical activity (MVPA) at 49.71 minutes/day.
- SB showed a significant positive correlation with Body Mass Index (BMI) and Mass of Body Fat (MBF).
- MVPA demonstrated a significant inverse correlation with BMI and MBF, and meeting MVPA guidelines was associated with better body composition metrics.
Conclusions:
- Vigorous PA and reduced SB are crucial for controlling adiposity in children.
- Promoting high-intensity physical activity and decreasing sedentary time are important strategies for improving children's body composition.
