Background: Rapid advancements in digital technology have led to increased gadget use among adolescents, resulting in prolonged screen time among senior high school students. Although screen time supports learning and access to infomation, excessive use may reduce physical activity, impaired sleep quality, and limit social interaction, potentially affecting motor strength. Methods: This cross-sectional analytic observational study involved 228 senior high school students aged 15-18 years in Tangerang Regency, selected using stratified random sampling. Screen time was assessed using the Questionnaire for Screen Time of Adolescents (QueST), while motor strength was measured with a Camry handgrip dynamometer. Data were analyzed using the Chi-square test with SPSS. Results: Most respondents reported high screen time (73.24%) and low motor strength (58.77%). Students with high screen time were more likely to have low motor strength (70.66%), whereas those with low screen time more frequently demonstrated strong motor strength (59.26%). Chi-square analysis revealed a significant associations between screen time and motor strength (p<0.001). Conclusion: High screen time is significantly associated with reduced motor strength among senior high schools students. This highlight the importance of balanced screen use to support adolescents' physical development and promoting healthier daily activity patterns.
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