Reduced Physical Activity and Increased Weight Status in Children and Adolescents During the COVID-19 Pandemic: A Systematic Review.

BACKGROUND/OBJECTIVES: The COVID-19 pandemic has impacted the lifestyles of children and adolescents because of the restrictions imposed to contain the infection. This systematic review examined the possible reduction in children's and adolescents' physical activity and changes in their BMI and weight status.

METHODS

A systematic review (PROSPERO: CRD42024589208) of English-language studies published up to 1 October 2024 in individuals with a mean age between 6 and 18 years that investigated physical activity data before and during or after the pandemic and focused on their BMI and weight status according to age, sex, and country making use of PubMed, Web of Science, and Scopus, identified 1040 possible articles.

RESULTS

Following the PRISMA statement, 26 articles with a whole set of 138,737 children and adolescents were enclosed in the review. The majority of included articles were of moderate quality, as determined by the Newcastle-Ottawa Scale adapted for observational studies. The studies found a decrease in PA, an increase in sedentary activities during/after the lockdown, and an increase in BMI and prevalence of overweight and obesity, especially in males and 8-11-year-olds.

CONCLUSIONS

The interruption or restriction of outdoor physical activities and sports during the COVID-19 pandemic resulted in a more sedentary lifestyle among children and adolescents, contributing to an overall increase in BMI and obesity, with alarming implications for related health risks and other noncommunicable diseases. Therefore, the adverse effects of restrictive measures should be assessed when implementing public health strategies during pandemics.