Qual. life res. Qual. life res. Does fitness attenuate the relationship between changes in sitting time and health-related quality of life over time in community-dwelling older adults? Evidence from the EXERNET multicenter longitudinal study López-Torres O. del Pozo-Cruz B. Maroto-Sánchez B. Vila-Maldonado S. Gómez-Cabello A. Universidad de Zaragoza Martín-García M. González-Agüero A. Gusi N. Espino L. Casajús J.A. Universidad de Zaragoza González-Gross M. Ara I. Pedrero-Chamizo R. 2019 research-article