Aim Given the increasing occurrence of cases of cardiorespiratory arrest on soccer fields around the world, it seems pertinent to find out the degree of training and the attitude shown by the players and coaches themselves.

The objective was to measure the knowledge and attitude of soccer professionals before and after a training intervention.

Method After an exhaustive bibliographic review, a series of questions have been analyzed and selected, with which an ad hoc questionnaire has been prepared. This questionnaire has been completed by soccer players from the Spanish first division, male and female teams and their coaches. Once the data was collected, a training workshop was carried out to improve both the attitude and knowledge in relation to cardiopulmonary resuscitation (CPR).

This longitudinal descriptive study, carried out on soccer players and coaches during the year 2021. In accordance with Law 14/2007, of July 3, on biomedical research, all the data derived from this study have been treated separately from the identity of the group studied, as stated in the Declaration of Helsinki on research with human beings (2013), Regulation (EU) 2016/679 of the European Parliament and of the Council of April 27, 2016, on natural persons in what regarding the processing of personal data and their free circulation, and Organic Law 3/2018, of December 5, on the Protection of Personal Data and guarantee of digital rights. The study was approved by the Ethics Committee for Biomedical Research of the CEU Cardenal Herrera University (CEEI22/286), prior approval by the medical teams of the football clubs. of the first division of the Santander League in the Valencian Community: Villarreal Club de Fútbol, Elche Club de Fútbol and Levante Unión Deportiva to participate in it. All participants gave their written consent after being informed.

After the bibliographic search of the questionnaires existing up to now to assess both the attitude of helping others and the knowledge of CPR in lay and healthcare first responders, a questionnaire was configured based on the questionnaires found due to their suitability.

After answering the questionnaire, a 2-hour training workshop was held where a theoretical explanation was given to recognize a cardiorespiratory arrest, the correct technique of chest compressions, ventilations and DESA management, in addition a practical class was carried out with CPR training models ( Manikin for CPR practices Little Anne QCPR. Laerdal) and AED simulation for CPR training (AED Practi-Trainer - Bilingual. WNL). Both theoretical and practical training were given by a basic life support instructor from the Spanish Society of Intensive Medicine and Coronary Units (SEMICYUC), the participants were instructed under the guidelines of the 2021 CKD recommendations.

One month after the training workshop, the questionnaire was passed electronically again, through a link, to obtain the post-training results.

The Shapiro-Wilk test was used to verify the normality of the variables. In case of breaking the normality condition (p<0.05) non-parametric tests were used. The calculation of each questionnaire was carried out awarding one point if the answer was correct and zero points if it was not.

Inclusion Criteria: Be a professional football player or coach and agree to participate in the study -

Exclusion Criteria: Not completing the questionnaire one month after the educational intervention

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We are planning to send the results to "Emergencias" a Spanish journal about CPR.