Cambio De Research Articles

Cambio de natalizumab a fingolimod: ¿reducción del período de lavado?

Cambio de natalizumab a fingolimod: ¿reducción del período de lavado?

Variación de la escorrentía superficial por el cambio de uso de suelo en la cuenca del río Duero

La dinámica y disponibilidad del recurso hídrico es un aspecto fundamental en el estudio de las cuencas hidrográficas. Desde la perspectiva temporal, el recurso hídrico está relacionado con la precipitación, que varía con los eventos hidrometeorológicos, mientras que espacialmente, está relacionado en gran medida con el uso de la tierra o la cubierta vegetal. Se investigaron los cambios en la escorrentía superficial del río Duero basin, México, utilizando el modelo SWAT. The input data for the model include climatic variables, soil properties, topography, and four periods of land use map. Las estimaciones de escorrentía del SWAT se compararon con los datos de caudal del Banco Nacional de Datos de Aguas Superficiales. En 1983 se observó un registro elevado de escorrentía de hasta 30 Dam3 (decámetro cúbico) en los municipios de Tangamandapio y Tangancícuaro, que probablemente se asoció con la tala de bosques desde la década de 1970; también se observó una disminución de escorrentía a 10 Dam3 en 2000, lo que probablemente refleja la práctica de conservación del manejo forestal. Las simulaciones para 2011 y 2014 indican alta escorrentía en el municipio de Chilchota debido a la modificación de sus áreas forestales y agricultura tradicional para acomodar el cultivo del aguacate y bayas.

Aptitudes gerenciales y gestión del cambio de funcionarios en Sede Central del Gobierno Regional Junín y Huancavelica

El tema alude a las capacidades competenciales que poseen los funcionarios públicos de dos sedes centrales de gobiernos regionales del país, con disposición para asumir las transformaciones de sus jurisdicciones. El objetivo fue, determinar la relación que existe entre aptitudes gerenciales y gestión del cambio de funcionarios de Sede Central del Gobierno Regional Junín y Huancavelica en el año 2019. Investigación básica cuyo diseño es correlacional, comparativo. La población y muestra censal compuesta por 34 funcionarios de las sedes Centrales de los Gobiernos Regionales de Junín y Huancavelica (17 de cada uno). Se recopiló información mediante la técnica denominada “encuesta” y el instrumento denominado “cuestionario”; el procesamiento de los datos por medio de la utilización de programas estadísticos: SPSS v_25 y la hoja de cálculo de Microsoft Excel 2013. Se concluyó que: con una correlación positiva muy fuerte (0,827), existe relación directa entre las aptitudes gerenciales y gestión del cambio de funcionarios en Sede Central del Gobierno Regional Junín, 2019; con una correlación positiva muy fuerte (0,808), existe relación directa entre las aptitudes gerenciales y gestión del cambio de funcionarios en Sede Central del Gobierno Regional Huancavelica, 2019.

La formación universitaria española sobre organización de eventos: retos del sector / Spanish university training in events managment: challenges of the sector

Las transformaciones que el sector comunicativo está experimentando en los últimos años ponen de manifiesto necesidades formativas que el mercado laboral demanda. La digitalización de los contenidos, el cambio de la relación marca-consumidor o la organización de eventos son sectores especialmente necesitados de nuevos perfiles profesionales. Los eventos como espacios singulares que ofrecen un valor añadido transformados por la presencia digital en medios sociales, la contribución de influencers, la utilización de apps, el uso del streaming o la gamificación, es uno de los sectores con mayores necesidades. En este sentido el objetivo del trabajo que aquí se presenta es realizar un estudio exploratorio descriptivo de las titulaciones que actualmente ofrecen estos estudios en las universidades españolas. Se lleva a cabo una metodología mixta cuantitativa-cualitativa y un análisis de contenido como técnica de estudio de la muestra analizada: todas las titulaciones de posgrado y grado relacionadas con la Organización de Eventos publicadas en RUCT (Registro de Universidades, Centros y Títulos). Entre otros resultados concluyentes, la investigación refleja la tímida apuesta que la universidad española hace por la formación en un sector que en este país mueve grandes cifras y puestos de trabajo, así como cierta carencia en cuanto a la incorporación de perfiles emergentes adaptados a la evolución del sector.Palabras clave: Organización de eventos, universidad, grado, máster, retos, perfil del egresado. Abstract The events sector moves around 6,900 million euros a year, and provides jobs for thousands of professionals. The digitization of our era has transformed the way we communicate and, therefore, the way events are organized, presented and disseminated. On the other hand, the transformations that the communication sector has undergone in recent years highlight the training needs that the labor market demands. The digitization of content, the change in the brand-consumer relationship or the organization of events are sectors that are especially in need of new professional profiles. Events as unique spaces that offer added value transformed by the digital presence in social media, the contribution of influencers, the use of apps, the use of streaming or gamification, are some of the tools that need this update in training. The management of good digital communication in events allows, among other things, to identify experts and prescribers, create a community around the event, broadcast live activities, virtual networking, create an online debate before, during and after the event, etc. Therefore, future event organizers should have a multidisciplinary training and with very defined skills such as knowledge of new 2.0 technologies, versatility and adaptability, as well as creative and strategic capacity. In fact, not all actions communicate by themselves, they must be accompanied by quality actions and commitments. The need for new professional profiles in the different areas of communication is a reality pointed out and studied both from the institutional and academic spheres. The objective of the work presented here is to carry out a descriptive exploratory study of the degrees currently offered by these studies in Spanish universities, to check whether they respond to the training needs demanded by the sector at present. The methodological approach used to address the study presented is qualitative-quantitative, specifically using content analysis as an ideal technique in social science studies related to communication. A mixed quantitative-qualitative methodology and a content analysis are carried out as a study technique of the analyzed sample: all postgraduate and undergraduate degrees related to the Organization of Events published in RUCT (Registry of Universities, Centers and Titles). In the first term, the more formal aspects of the sample degrees are analyzed, both in master's degrees and in degrees, to establish their basic characteristics in analysis files that collected the following qualitative variables: name of the university, type of degree. Second, a content analysis of the study plans of the selected postgraduates is carried out, using the information hosted on the web pages of each university as a source of access. Among other conclusive results, the research reflects the timid bet that the Spanish university makes for training in a sector that moves a large number and jobs in Spain. Especially in the public university, since only one university offers a postgraduate degree in this area, compared to the six offered by the private university. Likewise, it is found that professional careers change according to work scenarios, and a certain lack of incorporation of emerging profiles into the evolution of the sector is observed, so a more precise interrelation between profile-task / function-specialization should be established. Keywords: Events management, university, postgraduate degree, bachelor´s degree, challenges, graduate profile.

Cambio de las manifestaciones de agua subterránea y características de los ecosistemas asociados en el semiárido mexicano

Background. The city of San Miguel de Allende, Guanajuato, was founded in the semi-arid of Mexico in which historically there were numerous springs in the lower part of the La Laja Upper Basin. Its history has led to an excessive extraction of water from the aquifer to meet different needs at the time. Goals. Understand the evolution of the manifestations of groundwater in the Area of Hydrological Influence of the city of San Miguel de Allende (AIHCSMA, in spanish) and in particular the permanence of some springs that allow to identify pro- posals of management towards the conservation of the vegetation and the biodiversity, to recover the water operation in different scales of time. Methods.It was madea delimitation of the area of influence was elabo- rated with hydrological bases (AIH), hydrogeological, history, mapping and characterization of the ecosystems associated to these manifestations. Results. The hydrogeological environment is composed of volcanic rocks in the upper parts of the sub-basin, as well as by poorly consolidated sediments and alluvial fans in the middle and lower parts. 23 springs and three swamps were located and characterized; currently two springs and one swamp have completely dried and two marshes have diminished their historical flow. In the AIH there are 504 wells, of which 61 hm3/year are extracted. The main water pathways are fractured rocks and the granular medium. Conclusions. The location of the springs and swamps is related to geological contact zones between different tectonic structures, they present diverse characteristics that indicate local flows and one of intermediate type; the decrease or loss of flow is associated with the opening of nearby wells. Management proposals are proposed towards the conservation of ve- getation and biodiversity in the sub-basin to recover water performance at different time scales.

De frailes a escolta. Valor histórico del Cuartel de Barbones de Lima (1825-1879)

En el distrito de El Agustino, apenas a la salida de la antigua muralla de Lima, se ubica el histórico y antiguo Cuartel Barbones —valioso conjunto donde entre otras dependencias se acuartela la escolta del presidente de la República, de importante participación en el tradicional cambio de guardia en la Plaza Mayor— cuya larga historia comienza cuando fue convento y hospital de la casi desaparecida orden religiosa de los betlemitas. En esta investigación se ha buscado contextualizar los hechos ocurridos entre 1825 y 1879, años de la entonces nueva República Peruana, de la relación de la Iglesia con el Ejército y de su impacto en el patrimonio edificado religioso teniendo como ejemplo al antiguo Hospital de Convalecientes Nuestra Señora del Carmen.

Cambio de color de pie tras COVID-19

Cambio de color de pie tras COVID-19

Superdiversity and social policies in a complex society: Social challenges in the 21st century

Superdiversity is a characteristic of contemporary societies that affects processes of social change and social policies. Using meta-analytical methods, this article reviews how superdiversity is addressed in the literature to better inform social policies from a sociological perspective. A search of the literature in English and Spanish revealed 76 articles using different methodological approaches over the period 2007–2019. The descriptors for the search were superdiversity, cultural diversity, migratory flows, global migration, population change, social interactions, social change, social complexity, social care, social policy, superdiverse contexts, age, gender and migrants/ superdiversidad, diversidad cultural, flujos migratorios, migración global, cambio de población, interacciones sociales, cambio social, complejidad social, cuidados, política social, contextos superdiversos, edad, género and migrantes. The main results are the identification of key aspects to inform social policies and promote sustainable social change consonant with the current social reality.

From pinta to changed man: performing reinsertion and escaping color at the Nicaraguan margins

ABSTRACT Even though the Sandinista nation-building project claims to stand above ethno-racial differences and instead foregrounds class as the major social divider in Nicaragua, the popular experience of class on the mestizo-dominated Pacific coast remains heavily entangled with notions of whiteness/progress and darkness/backwardness. Given that bodies and spaces of social relegation are imbued with expectations of class and color, the social imaginary enveloping the prisoners is colorized in a particular way. However, through the institutional discourse of ‘cambio de actitud’ (change of attitude), Nicaraguan prisoners are pushed to engage in moral performances to lose their delinquent ‘color’ (also a popular metaphor for stigma). In doing so, they both embody and seek to distance themselves from their stereotypical presentation as urban ‘pintas’ (literrally ‘painted ones’, colloquially used to refer to ‘delinquent-looking’ young men). Based on long-term ethnographic research with (formerly) imprisoned young men, I draw out the imaginary surrounding the urban pinta, and then explore the metaphor of ‘color’ widely repeated by my research participants. In doing so, I argue that the ways in which (formerly) imprisoned young men resist and deal with the moral politics of policing and confinement reveals an inherent process of exposure; of coloring and losing color.

Changes in disordered eating behaviors over 10 or more years: A meta-analysis.

The present meta-analysis evaluated changes in individuals' risk of engaging in distinct disordered eating behaviors (DEBs) in the long-term. Longitudinal studies assessing changes in DEBs via ≥2 assessments with a time lag of ≥10 years were included. Risk ratios were calculated for baseline to 10-14.9-year (M = 11.04) follow-up and baseline to ≥15-year (M = 18.62) follow-up changes in the use of binge eating, multiple purging, self-induced vomiting, laxatives, diuretics, diet pills, compensatory exercising, fasting/dieting, and multiple DEBs; Cohen's d was used for continuous binge-eating plus purging variable changes. Subgroup and meta-regression analyses tested whether eating disorder (ED) clinical sample versus nonclinical sample status, female versus male sex/gender, higher versus lower study bias, and baseline mean age and body mass index influenced overall effect magnitude for analyses with sufficient data. Seventeen studies (26 [sub]samples) were included. Overall, individuals' risk of engaging in various restrictive eating and other compensatory behaviors decreased over time and the magnitudes of risk reductions for the use of certain compensatory DEBs were larger over longer follow-up durations. Specifically, for significant DEB change models, risk reductions spanned from 20.0-39.8% for 10-year follow-up and 24.7-74.8% for ≥15-year follow-up. However, nuances were found in the nature of these DEB changes as a function of DEB type, follow-up length, ED versus nonclinical sample composition, and baseline mean age. These findings provide important information that can help identify treatment priorities and suggest that targeted and tailored preventative ED treatments warrant consistent implementation at the community-level, particularly for youth.

Undoing the “Cemetery of the Living”: Performing Change, Embodying Resistance through Prison Theater in Nicaragua

This paper explores the gendered and spatialized dynamics that underpin prisoners’ and official discourses of “change” (cambio de actitud) in Nicaragua as these were manifested at two prison facilities during a lengthy period of prison theater training. Teasing out the way in which “change” is resisted, adapted and appropriated by prisoners as they simultaneously embody and contest state discourses of penal reeducation, I argue that while re-educational spaces present opportunities for “doing freedom”, temporarily relieving the tightness of prison, they are also fundamentally part of the prison’s power structure and political-moral realm. Herein change is often posited as opposed to violence, yet my research points to a dialectical relationship rather than a binary opposition between the two, because within the wider co-governance system of Nicaragua’s prisons, violence appears to exist in a parallel rather than past relationship to prisoners’ processes of change.

Efecto del cambio de hábitat en las características nutricionales y funcionales de 16 accesiones de quinua (Chenopodium quinoa Willd.) cultivadas en la Costa Peruana

El objetivo de la investigacion fue evaluar el efecto del cambio de habitat en algunas caracteristicas nutricionales y funcionales de 16 accesiones de quinua con diferente contenido de saponinas, colectadas en la Sierra de Cuzco (promedio 3237 m.s.n.m.) y cultivadas en la Costa de Lima (235 m.s.n.m.) en Peru. Las quinuas se lavaron y secaron, para su posterior analisis. La cantidad promedio de proteinas (18,21 1,00%), cenizas (3,33 0,51%) y fibra dietaria Total (12,94 1,40%), de los cultivos de la Costa, fueron significativamente mayores (p value < α (0,05)), en comparacion a sus homologas originales de la Sierra (15,68 1,57%, 2,40 0,23% y 10,56 1,01%, respectivamente); mientras que la cantidad promedio de carbohidratos (69,74 1,32%), la digestibilidad de almidon in vitro (46,97 23,40%) y la digestibilidad de proteina in vitro (63,62 4,32%), fueron significativamente menores respecto las quinuas originales de la Sierra (72,19 3,01%, 59,16 23,94%, 67,21 6,28%, respectivamente). La humedad, grasa y fibra bruta, el contenido total de polifenoles y los niveles de capacidad antioxidante no mostraron cambios significativos. Se demuestra que el cambio de habitat influye en algunas de las caracteristicas nutricionales y funcionales en los granos de quinua.

Desimplementación de actividades clínicas de bajo valor. De la evidencia, pasando por el consenso, hasta el cambio de prácticas

Desimplementación de actividades clínicas de bajo valor. De la evidencia, pasando por el consenso, hasta el cambio de prácticas

El Freud cognitivo: Los conceptos de la Física en El Proyecto

espanolEl Proyecto de Psicologia para Neurologos constituye el mas energico intento de Freud de formular un modelo de funcionamiento psiquico en el marco de las Ciencias Naturales. Asi, estudia la composicion del sistema mental llegando a diferenciar la existencia de tres subsistemas neuronales y analiza los avatares de la cantidad Q, esencia de la dinamica psiquica y fundamento de la organizacion Yoica. El proposito de este trabajo es explicitar el uso de los conceptos provenientes de la Fisica de su epoca y la forma que tomaron en el Proyecto. Se presentan cuatro ejes: (1) La nocion de sistema, estado y cambio de estado, para analizar las proposiciones metateoricas. (2) La sustentacion de la dinamica psiquica en el primer y segundo principio de la Termodinamica. (3) El simil de las nociones electrodinamicas en el funcionamiento del aparato psiquico. (4) El estudio de las caracteristicas ondulatorias como sustento del tercer subsistema neuronal del modelo. EnglishThe Project for a Scientific Psychology is Freud's most forceful attempt to formulate a model of psychic functioning within the framework of the natural sciences. In order to do this he defines the psychism as a system constituted by specifiable material particles, the neurons, particles subject to changes ofstate according to an operator of change of state conceived as an amount (Q) and on which the laws of Newton validly operate. In this way, he studies the composition of the mental system, differentiating the existence of three neuronal subsystems (Fi, Psi and Omega) and analyzing the avatars of the quantity Q as a state change operator, which is essentially the motor of the Psychic dynamics and foundation of the Ego organization organization, taking this organization as a particular state of the distribution of Q in the system. The purpose of this work is to make explicit the use of the concepts coming from the physics of that time and the form they took in the Project. This paper presents four axes: 1) The notion of system, state and change of state. Freud advocates for a Psychology defined as natural science as capable of representing phenomena as quantitatively determined states of specifiable material particles. The system issubject to state changes according to a physical and measurable change ofstate operator, which corresponds to the notion of quantity (Q). 2) The support of psychic dynamicsin the first and second principles of thermodynamics. The tendency described in the Project as an impulse to the discharge of the neuronal tension to zero, is heiress of a model constructed according to the first two principles of the thermodynamics. The notion of the general irreversibility of the psychic process, despite the mechanisms that retard, and even partially reverse the direction of the process, is an implicit idea on which all repetitive phenomena are based. The concept of facilitation itself involvesthe irreversibility of the process since it does not contemplate the possibility that mechanisms exist that may allow the reverse operation, except in the exceptional situation in which, for different reasons, the expected spontaneous sense is reversed, generating the process of regression. 3) The analogy of electrodynamics notions in the functioning of the psychic apparatus. Neurons, as conductors charged by a current flowing in a given direction, are also capable of storing a quantity of excitation, cathexis, neologism derived from the word cathode, used in physics. The idea of gradual local differences in potential is the only possible justification within the model for explaining psychic work as a product of the interrelationship between energy and work. Thus, it is difficult to say that when Freud developed his project he was not thinking of an electrodynamics model, it is difficult to imagine that he did not think of current (electron flow) when he spoke of current, or that he did not think of physical resistances when he spoke of resistances, or that he did not think about tension when he described the storage of potential excitation, or else that he did not seek, finally, to formulate an Ohm law of neural function, when he spoke of their relations. 4) The study of the wave characteristics as the basis of the third neuronal subsystem of the model. The Project solves the problem of the quality by assigning to the currents in flow another property, the periodicity, independent of the quantity. This periodicity refers to frequency and frequency changes, which only in the Omega system become significant, because in the Psisystem they do not exist, neither in Fi. These are, in Freud's words, monotonous, that isto say of uniform and constant frequency so as to give a unique tone.

Hipertension arterial maligna y trombopenia en trasplantado renal tras cambio de sirolimos a tacrolimus

We report a case, undescribed until now, of a renal transplant patient who developed a malignant hypertension after change sirolimus by tacrolimus. Also presented thrombocytopenia and anemia as a first orientation could suggest a hemolytic uremic síndrome, but subsequent events confirmed that everythins was due to malignant hypertension.

Family business and value-added distribution: a socioemotional wealth approach

ObjetivoSe ha investigado que las empresas familiares limitan el objetivo de maximización del beneficio a cambio de mantener el control de la empresa y de transmitir ese control a futuras generaciones. Sin embargo, no siempre esas decisiones son compartidas por los accionistas que se encuentran fuera del contexto familiar, es entonces cuando surgirán tensiones en el interior de la empresa que podrán afectar a la rentabilidad y a la cotización en bolsa de la empresa familiar. Nuestro objetivo es analizar las tensiones internas que sufren las empresas familiares en la distribución del valor añadido y si estas perjudican sus resultados por las restricciones en las que basan su funcionamiento.Diseño/metodología/aproximaciónSe ha realizado un análisis factorial para medir la tensión que resulta de la distribución del VA en una muestra de 105 empresas españolas cotizadas durante el periodo 2005-2012. Un análisis de regresión ha sido utilizado para estudiar el impacto de esta tensión sobre los precios de sus acciones.ResultadosLos resultados muestran que ser empresa familiar ejerce un efecto positivo en el factor tensión empresarial y que, tanto la rentabilidad, como el precio de las acciones, están inversamente relacionados con los factores de tensión. Por ello concluimos que la decisión de mantener el control en las empresas familiares pone en riesgo la rentabilidad y cotización de las acciones.Implicaciones prácticasUn análisis de la distribución del VA en las empresas familiares arroja luz sobre si la dirección, mediante sus decisiones, preserva o no su riqueza socioemocional generando tensiones entre los agentes económicos, afectando a su rentabilidad y continuidad. Este conocimiento es importante para los grupos de interés de la empresa así como para futuros inversores.Originalidad/valorEste es el primer estudio en que el Estado del Valor Añadido es utilizado para analizar el estilo de gestión de las empresas, y especialmente como las empresas familiares tratan de preservar su riqueza socioemocional, y las tensiones internas generadas por ello.

LA POLIFONÍA Y EL SILENCIO COMO ESTRATEGIAS DE DENUNCIA DE LA DICTADURA EN LA NARRATIVA DE LUISA VALENZUELA

The purpose of this study is to analyze the strategies used by, the Argentinian writer, Luisa Valenzuela to denounce the abuse and human rights violations by dictatorships in the Southern Cone. Through the analysis of Cambio de armas and Cola de lagartija, from a Bakhtinean dialogical discourse perspective, we discuss the use of polyphony and silence as discursive strategies used by Valenzuela to condemn Argentinian dictatorship and to portray the social and political impact of Argentinian dictatorship between 1966 and 1982.

Cambio De Residencia Fiscal (Change of Fiscal Residency - Tax Redomiciliation)

Spanish Abstract: La utilizacion de un cambio de domicilio fiscal via Treaty Shopping resulta cuestionable, mirando el interes fiscal comprometido y las discusiones en el contexto BEPS de la OECD. El SII de Chile emitio un reciente oficio sin condicionar claramente el hecho que el cambio de residencia fiscal, aun cuando formalmente pudiera ser aceptado por Chile, a partir de la existencia de un Certificado de Residencia, queda sujeta a las instancias de fiscalizacion conforme a la legislacion domestica y la legislacion contenida en los tratados internacionales.English Abstract: The change of fiscal residency or tax redomiciliation is a planning technique used in order to exploit the asymmetries existent in the domestic and international tax laws between jurisdictions. This allows to obtain tax efficiencies in the treatment of corporate and personal income taxes. The IRS in Chile recently issued Ruling No 1985/2015 in which it accepts a change of fiscal residency with no specific consideration with respect to the Treaty Shopping problems in the context of the OECD-BEPS project.

Fantasies of Erasure: A New Reading of Luisa Valenzuela’s "Cambio de armas"

Abstract "Cambio de armas," Luisa Valenzuela much anthologized story, has been read as an allegory of the Argentine’s last military dictatorship and its grip on the nation’s psyche as well as bodies. In this essay, Martínez-Raguso proposes that the story is narrated from the perspective of a desaparecida whose memory has been erased, or is under erasure, by the military officer she had attempted to assassinate. Now in full control of the situation, the officer who was once her target wants to prove that he can fully reform (and re-form) the young and attractive former subversive before the dictatorship collapses. But his mission as a hardline reformer will only be complete when he succeeds in turning his once armed attacker into a disarmed would-be wife and a lover who desires him sexually. Viewed from this perspective, says Martínez-Raguso, the colonel’s private efforts metonymically and microscopically reflect the military dictatorships efforts to "reorganize" the nation by torturing, disappearing or re-indoctrinating its enemies. The author further argues that the story’s fragmented structure and the narrator’s playful yet ominous sense of a language that does not quite correspond to ordinary reality signal the woman’s subconscious resistance to the colonel’s sadistic plan. Referencing both Lacan’s theories of the role of language in subject formation and Derrida’s notions of différance (deferral/ difference) and sous rature (under erasure), this article offers new interpretative possibilities for a story that resonates in today’s political climate almost as much as it did in the early 1980s when it was first written.

Diferencias entre jugadores de fútbol de distintas edades en la capacidad de aceleración, cambio de dirección y salto

The main objectives of this study were to analyze: acceleration capacity; change of direction ability (CODA); vertical jump (VJ); and horizontal jump (HJ); in under 16 and under 18 footballers and to determine the differences in these qualities according to category. The total sample (n = 34) was divided into two groups according to the category in which the subjects competed. Group 1 (U16, n = 17), competed in the U16 Basque League (15.12 ± 0.70 years) while Group 2 (U18, n = 17) competed in the National U18 League (16.94 ± 0.90 years). Significant differences were found between the U16 and U18 categories in acceleration capacity (p 0.05, d = 0.3, low). With respect to jump capacity, the U18 players recorded a greater capacity for the horizontal jump (p 0.8, high). However, these differences were not evident in all the types of vertical jump. In the vertical jump without a countermovement (VSJ) similar values (p > 0.05, d = 0.3, low) were recorded by the players of different ages. However, significant differences were obtained in the elastic index (IE, p 0.05, d = 0.6, high) and in the arm swing vertical countermovement jump (VCMJAS, p > 0.05, d = 0.9). The results suggest that it could be of benefit to use tests of acceleration and vertical jump, using the stretch shortening cycle and horizontal jump, to analyze performance in young footballers.