Hamid Mohammadi - Department of Clinical Psychology, Garmsar Branch, Islamic Azad University, Garmsar, Iran
Halimeh Nafei - Department of Educational Psychology, University of Tehran, Faculty of Psychology, Tehran, Iran.
Tayebeh Baniasadi - Visiting Scholar, Department of Public Health, Kinesiology Indiana University, USA
Zahra Chaharbaghi - Department of Physical Education, Islamshahr Branch, Islamic Azad University, Islamshahr, Iran

Background: Self-reported studies showed that physical activity is associated with health-related quality of life in children with ADHD. Considering the limitations of self-reporting methods, we aimed to assess the association between accelerometer-measured physical activity and health-related quality of life among children with ADHD.Methods: ۶۸ participants (۲۸ girls, mean age of ۱۰.۲۲±۱.۵۵ years) wore the accelerometer for seven consecutive days. PedsQL was used to measure health-related quality of life. Mann-Whitney U, Spearman correlation test, and regression analysis were used to analyze data.Results: On average, the daily moderate-to-vigorous physical activity (MVPA) was ۳۶.۴۶ minutes, which is below the WHO guideline. Boys engaged significantly more in daily MVPA than girl. Moreover, gender significantly predicted health-related quality of life (F = ۴.۵۸, p = ۰.۰۳, Adjusted R۲ = ۰.۰۸, β = ۰.۷۵). Sedentary time% has inversely predicted health-related quality of life (F = ۲.۸۱, p = ۰.۰۴, Adjusted R۲ = ۰.۰۳, β = ۰.۵۳). Finally, daily MVPA predicted health-related quality of life (F = ۵.۷۳, p = ۰.۰۲, Adjusted R۲ = ۰.۰۹, β = ۰.۱۳).Conclusion: These finding indicate that physical activity and quality of life are critical concerns for children with ADHD. Accordingly, it is necessary to adopt appropriate strategies to develop more active lifestyles among this population

ADHD, Physical Activity, Quality of life, accelerometer, Gender