Physiological impact of the facial mask at rest (2): Modification of Cardiac Variability (HRV) in young athletes Ignasi de Yzaguirre Maura, Jaume Escoda i Mora, Mauricio Monaco, Gonzalo Grazioli, Jordi Santiago, Daniel Brotons i Cuixart

COVID-19: Analysis of cavitary air inspired through a mask, in competitive adolescent athletes Ignasi de Yzaguirre i Maura, Joaquim Terricabras Genís, Diego Dulanto Zabala, Mauricio Monaco, Jordi Santiago Garcia, Ferran Rupérez Vielba, Joan Vives i Turcó, Gonzalo Grazioli

COVID-19 and mask in sports Fernando Pifarré, Diego Dulanto Zabala, Gonzalo Grazioli, Ignasi de Yzaguirre i Maura