Cross-Sectional Study of Self-Concept and Gender in Relation to Physical Activity and Martial Arts in Spanish Adolescents during the COVID-19 Lockdown Lindell Postigo, David Zurita Ortega, Félix Ortiz Franco, Manuel González Valero, Gabriel Self-Concept Physical Activity Martial arts Gender Adolescents COVID-19 Lockdown The COVID-19 lockdown has negatively a ected individuals’ welfare. However, there has been no research published heretofore about the levels of self-concept (SC) in adolescents, nor how having practised martial arts (MA) or any physical activity (PA) before the lockdown may have influenced the SC in that time. Hence, this study aimed to analyze some demographic, physical, and psychosocial parameters in Spanish adolescents throughout the COVID-19 quarantine through a cross-sectional investigation, establishing correlations among these factors. Methods: The present study had a descriptive, comparative, and cross-sectional design. The sample comprised of 54 (39.7%) male and 82 (60.3%) female Spanish adolescents aged 12–18 (M = 14.49; SD = 1.80). An ad-hoc questionnaire collected sociodemographic data; the self-concept Form 5 (AF5) questionnaire obtained data on SC dimensions. Results: There were some di erences among the SC dimensions, with family and academic dimensions having higher values than the physical and emotional ones. Females’ academic SC was higher than that of males (p = 0.019). The practice of PA before the lockdown was positively associated with physical (p < 0.001) and social (p = 0.012) SC, yet there was no significant association between the previous practice ofMAand SC (p > 0.050). Conclusions: the findings suggest that the COVID-19 lockdown negatively a ected Spanish adolescents by decreasing their total SC and some dimensions of it, although PA may bu er psychological harmfulness in adolescents. 2020-11-03T10:11:02Z 2020-11-03T10:11:02Z 2020-08-13 info:eu-repo/semantics/article Lindell-Postigo, D., Zurita-Ortega, F., Ortiz-Franco, M., & González-Valero, G. (2020). Cross-Sectional Study of Self-Concept and Gender in Relation to Physical Activity and Martial Arts in Spanish Adolescents during the COVID-19 Lockdown. Education Sciences, 10(8), 210. [DOI:10.3390/educsci10080210] http://hdl.handle.net/10481/64014 10.3390/educsci10080210 eng http://creativecommons.org/licenses/by/3.0/es/ info:eu-repo/semantics/openAccess Atribución 3.0 España Mdpi