The aim of this paper is to analyze the interrelationships between the burnout and different psychosocial variables to which the grassroots football referee is exposed, in particular, associated with the influence of the environment and the level of verbal and physical aggression. To this end, a questionnaire was developed, consisting of items from the Maslach Burnout Inventory-General Survey(MBI-GS) and various self-constructed items designed to find out these psychosocial variables. First, a study of the structure of the form was carried out. Second, a structural equation model was designed in order to test the causal relationship between the variables under consideration. The results obtained point to the validity of the proposed theoretical model. It is recommended to initiate training programs for this group aimed at strengthening personal coping and social support strategies, which can help minimize the evolution of this syndrome.

The aim of this paper is to determine a bibliometric study through the Web of Science (WoS) database, to know the state of the art of the ISO 9001 and ISO 14001 standards. This is done through a search for publications, from the year of standard’s publication until the year 2018. The main contribution of this work is to take a view from the research lines taken to date in this emerging knowledge field, analyzing the countries, institutions, the most productive authors, as well as the main scientific journals that publish on the subject. Three main lines of research for ISO 9001 were related to its compression and benefits, its integration with other management systems, and its relationship to the financial performance of companies have been identified. On the other hand, around ISO 14001 there were four lines of research associated with its relationship with financial performance and sustainable development, its integration with other management systems, and its association with other environmental management systems, such as EMAS. From the review carried out, the need to deepen issues that have not yet received adequate attention from researchers, such as the rapid expansion of certifications in emerging countries imposed directly and indirectly by developed countries, is highlighted, the difficulties in the adoption process of norms and the perception of the implementation and certification of the ISO management systems by different interest groups, inter alia.

El uso de Twitter por parte de los diarios de información está muy extendido y es una forma de tener a sus lectores informados casi en tiempo real. En este artículo analizamos el discurso de los mensajes vertidos por los diez principales diarios de información general en España y las reacciones que provocan en la red social. El objetivo de esta investigación es analizar si es el discurso emocional de las noticias de cada diario el que provoca mayor difusión y atención por parte de los usuarios, así como conocer las emociones y sentimientos vertidos temporalmente en los mismos. Para ello se hizo un seguimiento entre octubre y noviembre de 2019 de noticias que incluyen acontecimientos importantes como sentencias, altercados o la celebración de elecciones generales. Mediante el empleo de técnicas de machine learning se analizaron con la aplicación de algoritmos 124.897 tweets, lo que permitió determinar las emociones y valencias, así como desarrollar estudios estadísticos y gráficos de dependencia entre variables emocionales y de valencia sentimental positiva o negativa. Los resultados evidencian que en general, no se emplean excesivos discursos emocionales que busquen impactar. Sin embargo, sí que se aprecian diferencias de uso emocional y de sentimientos entre los diarios que pretenden la fidelización del lector. Por contra se encuentra que la reacción de los usuarios está más ligada al hecho informativo en sí y a las emociones que les provocan, que al tipo de discurso emocional y/o polarizado. El día a día informativo determina en gran medida qué se consume por parte de los usuarios de la red social, en la que se aprecian discursos cambiantes en función de la línea editorial de cada diario.