[Prolonged television exposure in children and adolescents: health effects and protection strategies].

Objective: Since COVID-19 pandemic, screen time (ST) seems to have increased among children and young people. There is controversy about its impact in the physical and mental well-being of children. The aim of this study was to analyse the possible influence of excessive ST on child health through a systematic review of the literature.

Methods: Systematic review was done by two independent reviewers. We analysed the medical literature (MEDLINE data base) from 2017 to 2022. Data related to the effects of ST on children´s health were analysed along with strategies that can mitigate those effects.

Results: The search identified 3,151 articles, 37 finally selected as they fulfilled the demanded methodological quality criteria. Negative effects on children's health such as obesity, linked to a sedentary lifestyle, sleep disorders or anxiety problems in adolescents were detected. However, a better development of language or memory functioning, when interactive media were used, have also been described. Educational measures have proven useful in controlling exposure time and reducing exposure-related negative effects.

Conclusions: Although high levels of ST could affect children`s health, we have recorded some positive effects that are enhanced when parents get involved in TV watching (co-viewing). Exposure time should be customized according to every child's lifestyle.