Introduction. Frequency spectrum characteristics derived from raw accelerometry, such as spectral purity, have the potential to reveal detailed information about children’s movement quality, but remain unexplored in children’s physical activity. The aim of this study was to investigate and profile children’s recess physical activity and movement quality using a novel analytical approach. Materials and Methods. A powered sample of twenty-four children (18 boys) (10.5±0.6y, 1.44±0.09m, 39.6±9.5kg, body mass index; 18.8±3.1 kg.m2) wore an ankle-mounted accelerometer during school recess, for one school-week. Hierarchical clustering, Spearman’s rho and the Mann-Whitney U test were used to assess relationships between characteristics, and to assess inter-day differences. Results. There were no significant inter-day differences found for overall activity (P>0.05), yet significant differences were found for spectral purity derived movement quality (P 0.05), sin embargo, se encontraron diferencias significativas para la calidad del movimiento derivado de la pureza espectral (P <0.001). La actividad global se agrupó jerárquicamente y se correlacionó positivamente con la pureza espectral (P <0,05). Discusión. Este es el primer estudio que informa la pureza espectral de la calidad del movimiento derivado de la actividad física de los niños, en un entorno no controlado y nuestros resultados destacan el potencial para la investigación futura
