The aim of the study was to show the differences in the game statistics related to the service in professional and junior category in three surfaces and to determine statistical differences during the game regarding both categories. A total of 269 individual Grand Slam tennis matches (Australian Open, Wimbledon and Roland Garros) were selected on three different surfaces (hard court, grass and clay). The data was collected from the official websites of the tournaments. A total of 10 variables were analyzed in professional category and 7 in junior. Absolute players obtained higher values (p <0.05) of aces, aces per set, percentage of 1st Services and points won with 1st and 2nd Service and committed fewer double faults per set than juniors in all surfaces. It is concluded that the increase in performance in the variables related to the service plays a decisive role in order to achieve a professional status.

No abstract

Since the middle of the 20th century, irrigation in the southeast of Spain has displayed significant productive growth based on the intensive use of the scarce water resources in the area and the contribution of river flows from the hydrographic basin of the Tagus River to the hydrographic basin of the Segura River. Despite high levels of efficiency in the water use from the new irrigation systems, the water deficit has only intensified in recent years. The most dynamically irrigated areas (Campo de Cartagena, Valle del Guadalentín, Vega Alta del Segura and the southern coast of the Region of Murcia), were faced with a complex and trying future, resulting in numerous companies (agribusinesses) relocating to lease and acquire land in the northwest of Murcia to develop their intensive crops. The general objective of this article lies in the analysis of widespread landscape dynamics, and of agricultural dynamics in particular, in the rural environment of the northwest Region of Murcia (Spain). For this, an exhaustive analysis of the land cover and use transformations is carried out for the periods of time 1990–2000–2012–2018. The data studied come from the Corine Land Cover (CLC) project, carried out by the European Environment Agency (EEA). These spatial data are treated with geographical information systems (GISs) and represented by statistical and cartographic analyses and cross-tabulation matrices that indicate the dynamics of changes, loss and land gain. As the main result, we find that the areas occupied by new intensive irrigation on old rainfed farmland in the northwest Region of Murcia have increased in the last 30 years. Traditional irrigation is disappearing, and the environmental consequences (overexploitation of aquifers and decreased flows from natural sources), among others, are dire.

En este trabajo se pretende realizar una aproximación a los estados de ansiedad y autoconfianza que manifiestan los jóvenes judokas en los momentos previos de competiciones con fuerte carga de presión. El objetivo del estudio es determinar si, en este contexto situacional, existen diferencias entre judokas de categoría infantil y judokas de categoría cadete respecto a los valores en ansiedad y en autoconfianza. Han participado un total de 97 judokas varones, de los que 49 pertenecen a la categoría infantil, y 48 a la categoría cadete. La prueba utilizada para evaluar la ansiedad ha sido el Competitive State Anxiety Inventory-2 de Martens, Vealey y Burton (1990) que evalúa la ansiedad cognitiva, la ansiedad somática y la autoconfianza. La administración de la prueba se realizó durante la celebración del Campeonato de España de Judo. Los resultados muestran diferencias significativas entre la categoría infantil y la cadete respecto a los valores obtenidos en ansiedad cognitiva y en ansiedad somática (los judokas infantiles presentaban puntuaciones mayores), aunque no sucede así respecto a los valores obtenidos en autoconfianza. Se discute sobre los procesos adaptativos de los judokas de superior categoría para manejar mejor las demandas estresantes de la competición, así como la idoneidad de profundizar en estudios con muestras de judokas jóvenes que permitieran conocer mejor el proceso y la evolución de las manifestaciones de ansiedad y las estrategias o recursos que se pueden utilizar para manejarla.

Abstract:The spatial pattern of the urban development recently experienced by large urban areas is significantly changing the traditional city model based on its compactness. It is generating new forms of urban organization that imply morphological, territorial, social, and functional changes. We analyzed the spatial impact generated by the construction of the Altorreal resort in the Murcia region and its effects on the local population (e.g. number of inhabitants). The results obtained highlight the importance of this resort in terms of space and population compared with other neighborhoods of the city.