José María Izquierdo Velasco

University of Valladolid | UVA · Valoración del Rendimiento Deportivo, Actividad Física y Salud, y Lesiones Deportivas (REDAFLED)

Purpose: The aim of this study was to determine the influence of prematch perceived wellness on high-intensity locomotor activities of professional soccer players during in-season matches. Methods: Twenty male soccer players (26.74 [3.27] y; 179.77 [6.06] cm; 76.72 [9.33] kg), members of a professional soccer team, participated in this longitudinal...

Tradicionalmente, la programación y el entrenamiento en el fútbol se basaban en metodologías de deportes individuales como el atletismo. Este enfoque se caracterizaba por un entrenamiento descontextualizado y separado de los factores de rendimiento específicos del fútbol. A partir de los años 80 y 90, Francisco Seirulo (con su enfoque estructurado)...

La ponencia describió los resultados de un proyecto de innovación docente realizado en el curso académico 2023-2024 que implicó al alumnado del grado en Ciencias de la Actividad Física y del Deporte de la Universidad de Valladolid en el Campus de Soria. El objetivo principal fue que nuestros alumnos pudieran mejorar la capacidad de análisis y evalu...

Understanding food habits and nutritional knowledge in youth athletes could contribute to optimal recovery and improving performance in basketball. Therefore, the aim of this study was to assess the relationships between physical fitness, with food habits and nutritional knowledge in basketballers. Twenty-three healthy youth players to the same eli...

The aim of this research was to quantify the effects of the inclusion of drop set training (DS) on maximum dynamic strength (1RM) in back squat, jump ability (CMJ) and speed (10 m) in female basketball players. For this purpose, 25 participants (22.59 ± 3.73 years) of two amateur teams were examined in three times: initial assessment (T0), after si...

Resumen. El objetivo del presente estudio es analizar las fechas de nacimiento de las jugadoras de fútbol (n = 2.250) correspondientes a los 86 equipos que componen las mejores siete ligas profesionales femeninas de la Unión de Federaciones Europeas de Fútbol (UEFA), con el fin de observar el efecto de la edad relativa (RAE: Relative Age Effect) a...

Se analizaron datos del Comité Olímpico Internacional con el objetivo de informar sobre la participación y los resultados de los deportes colectivos de los equipos españoles en los Juegos Olímpicos de verano. En categoría masculina, baloncesto, balonmano, hockey hierba, vóley playa y waterpolo han destacado al estar presentes en más del 50 % de las...

This chapter aims to synthesize information regarding the importance, training methods, and evaluation of Change-of-Direction (COD) ability development in team sports, which significantly influences the physical and technical demands of the game. COD refers to the reorientation and alteration in the path of travel of the entire body's center of mas...

The objective of this study is to detect any performance factors in athletics throws between 1997 and 2015 in 662 throwers (15.67 ± 1.01 years of the National Program for Sports Technification of the Royal Spanish Athletics Federation using Machine Learning methods by means of algorithms (Logistic Regression, Random Forest and XG Boost). When exami...

Basketball clutch time is defined as minutes when the scoring margin is within 5 points with five or fewer minutes remaining in a game. Our aims were to explore the relations and to compare testosterone and cortisol behaviours, vertical jump (CMJ) and perceived exertion (RPE) between clutch time games (CT) and non-clutch time games (N-CT); during a...

En un mundo cada vez más digitalizado y tecnológico, el empleo de datos y métricas ha emergido como una poderosa herramienta para transformar la forma en que comprendemos y analizamos el deporte. Desde el contexto profesional hasta las actividades recreativas, los datos tienen un papel crucial en la toma de decisiones estratégicas y el rendimiento...

The aim of our study was to determine the predictors of physical performance evaluated by the mean of acceleration capacity (10-m and 20-m sprint) and jumping ability (CMJ) during three consecutive days' semiprofessional basketball tournament. For this, 24 male players (24,3±3,4 years) were monitored during the tournament to assess the percentage o...

We examine the differences in running performance demands and tactical individual actions for male amateur football wingers in four tactical formations: 4-2-3-1, 4-4-2, 3-5-2 and 3-4-2-1 during an entire season. Running demands were assessed in terms of: total distance run; distance traveled at 3 different speed ranges (Jogging, Running, and Sprint...

We examine the differences in running performance demands and technical-tactical actions for male amateur football wingers in four tactical formations: 1-4-2-3-1, 1-4-4-2, 1-3-5-2 and 1-3-4-2-1 during an entire season. Running demands were assessed in terms of: total distance run; distance traveled at 3 different speed ranges (D > 14.4 km/h; D > 19...

El objetivo de este artículo se centra en el estudio de aporte económico de las diversas competiciones deportivas de una comunidad autónoma española. Para el estudio se seleccionaron de forma aleatoria 6.981 asistentes en eventos deportivos. Los resultados exponen diversas tendencias que, basadas en evidencias, pueden resultar de utilidad para los...

Debido a la falta de investigaciones que analizan el rendimiento en el esprint en jugadoras amateurs de fútbol, este estudio analizó las diferencias de velocidad por posiciones de juego. Para ello, 64 jugadoras (23,86 ± 3,71 años) fueron examinadas por demarcaciones: defensas centrales (DFC, n=13), defensas laterales (DFL, n=12), mediocentros (MC,...

A well-designed football pre-season is crucial for the subsequent physical performance of the players. This study aimed to analyse, in this period, the effects of body composition, heart rate variability and physiological biomar-kers on female football players' physical performance. To this end, 22 amateur female football players (23.68 ± 3.69 year...

We aimed to compare teams’ attack styles in Europe and South America elite football in the two most valued domestic leagues in both continents (Spanish La Liga & English Premier League in Europe, and Argentinian Superliga & Brazilian Série A in South America). For this purpose, we used a sample of 84 teams and 3,780 cases in 1,214 games. Using an o...

La velocidad es uno de los indicadores clave para el desarrollo atlético del jugador de baloncesto. El objetivo de este estudio fue comparar los efectos que tiene en la velocidad un entrenamiento de fuerza (EF) y otro pliométrico (EP) desarrollados durante ocho semanas en jugadores jóvenes de baloncesto. Para ello, 48 jugadores (16,42 ± 1,13 años)...

Resumen: El objetivo de este estudio fue explorar la relación que pudiera existir entre la capacidad de aceleración y de salto (CMJ) con la carga de esfuerzo percibida (GL) durante una pretemporada de cinco semanas en un equipo juvenil masculino. En este periodo, veinte jugadores (edad: 17,3 ± 0,9 años) valoraban día a día su nivel de fatiga median...

Objetivo: Explorar la relación que puede existir entre la capacidad de aceleración y de salto con la carga de esfuerzo percibida durante un torneo semiprofesional de baloncesto de tres días consecutivos (fase de ascenso de categoría) Conclusiones y aplicación práctica: La carga de esfuerzo percibida permite establecer una alta relación con la capac...

The multilevel ordinal logistic mixed-effects method applied is proposed as a support tool to management in basketball teams helping to identify the game-related statistics that discriminate the final ranking in a regular season classification. A sample of 10684 games that cover 10 seasons and reach sample of 752 cases were evaluated from the two m...

This study aimed to analyze and quantify relevant effects of competition on performance factors in female basketball players (16.45±0.92 years) according to age (under-16 and under-18) and playing positions: guards (n=19), forwards (n=27) and centres (n=22). Participants completed tests to measure jump capacity (countermovement jump-CMJ) and sprint...

The purpose was to evaluate correlations between soccer training data (volume, types…) during preseason and competitive periods, with possible changes related to anthropometry and body composition in amateur women. Weight, body mass index, body fat percentage and muscle percentage were taken from 22 players (23.68 ± 3.69 years) before the start of...

Epidemiología de lesiones e incidencia en un periodo de diez años en jugadores de baloncesto sub-16 y sub-18 Injury epidemiology and incidence over a ten-year period in under-16 and under-18 basketball players Resumen: El propósito del estudio fue cuantificar e investigar las diferencias en los tipos de lesiones entre categorías sub-16 y sub-18 en...

In the context of tourism, sports are one of the major attractions countries offer. There cannot be the slightest doubt about the relevance of sports activities for the economy. Previous studies assessing the economic impact of sporting events have usually been partial equilibrium studies. This article contributes to the emerging body of literature...

Background Due to the early specialization of golf players, examining the within session sequence of training should be considered to enhance performance and prevent injury risk. The present study analyzed the effects of an 18-week concurrent training developed before or after a specific golf session in adolescence elite golfers on several performa...

Game demands in basketball. Short revision.

The concept of relative age effect refers to the consequences of the physical and psychological differences that may exist between those born earlier or later within the same calendar year. The objective of the present study was to examine this phenomenon in international professional football, identifying the influences of the continent. The sampl...

The aim of this study was to analyse and quantify the acute effects of competition on several performance factors in young female basketball players, between playing positions. To this end, 37 regional league players (17.21 ± 0.44 years) performed various tests to measure the rate of perceived of effort, sprint times and jump capacity immediately p...

The concept of relative age effect refers to the consequences of the physical and psychological differences that may exist between those born earlier or later within the same calendar year. The objective of the present study was to examine this phenomenon in international professional football, identifying the influences of the continent. The sampl...

The aim of this study was to examine the reliability of performance measures in the different phases and sub-phases of the countermovement jump (CMJ). Seventeen male athletes competing at a regional level completed 204 valid trails consisting of the execution of maximal hands-on-waist CMJs performed on a force platform. The vertical ground reaction...

The aim of this study was to analyse and quantify the acute effects of competition on several performance factors in under-19 male soccer players. To this end, 198 national league players (17.56 ± 0.78 years) performed various tests to measure jump capacity, kicking velocity and sprint times immediately pre-match (T1), at half-time (T2) and post-ma...

The aim of this study was to examine the reliability of performance measures in the different phases and sub-phases of the countermovement jump (CMJ). Seventeen male athletes competing at a regional level completed 204 valid trails consisting of the execution of maximal hands-on-waist CMJs performed on a force platform. The vertical ground reaction...

The concept of relative effect of age refers to the consequences of the physical and psychological differences that may exist between those born earlier or later within the same calendar year. The objective of the present study was to examine this phenomenon in Spanish throwers under 18s (Sub-18) and under 14s (Sub-14), identifying the influences o...

The concept of relative effect of age refers to the consequences of the physical and psychological differences that may exist between those born earlier or later within the same calendar year. The objective of the present study was to examine this phenomenon in Spanish throwers under 18s (Sub-18) and under 14s (Sub-14), identifying the influences o...

In football today is hard to establish in an objective and accurately manner cause-and- effect relationships between the sport performance factors and the teams' production capacity during a match. This difficulty stems largely from the confluence of the elements that work synergistically into each one of the motor responses provided by the athlete...

The ankle sprain is one of the most common pathologies in sportive activity. For this reason it is essential to make a good prevention program. One of the most effective methods which is being increasingly used is the propioceptive work. In the present essay, junior players’s response to a propioceptive training will be analyzed. Training duration...

Two kind of 6 weeks training program on different factors of maximal strength and power in different athletes (age = 16.86 ± 0.74 years old) improve force development (especially explosive strength and power). This program alternated workloads of different intensities. For this study we observed football, basketball, handball and volleyball players...

Two kind of 6 weeks training program on different factors of maximal strength and power in different athletes (age = 16.86 ± 0.74 years old) improve force development (especially explosive strength and power). This program alternated workloads of different intensities. For this study we observed football, basketball, handball and volleyball players...

RESUMEN El objetivo de esta investigación fue analizar los movimientos de progresión que realizan los escaladores de alto nivel durante su ascenso en competición. La muestra del estudio está compuesta por 72 varones que participaron en las pruebas de Copa de España de Escalada de Dificultad de 2009 y 2010. Se regis-traron 7738 movimientos para su a...

The aim of the current study was to analyze the muscular structure of the main lower limb muscles in vivo through ecography, the isokinetic strength of the knee and jump capacity. Independent variables were: sex (male vs. female), speciality (sprint vs. long-distance) and laterality (dominant leg vs. non-dominant leg). Muscular action (flexion vs....

The aim of the present study was to examine how maximal and explosive strength are affected by a 6 week two complex training programs in youth soccer players. The sample was divided into 3 groups: Control Group (GC, n=16), Training Group 1 (GE1, n=15) performed heavy strength and later plyometric program and Training Group 2 (GE2, n=15) performed h...

The aim of this study was to analyze movements carried out by climbers through the climb wall and to determine how muscles work when movement is created. Qualitative observation methodology was used. The sample studied was made up of 72 subjects (randomly selected) who participated in the Spanish Climb Championship of 2009 and 2010. Data conclude t...

RESUMEN El objetivo de este estudio fue elaborar un instrumento de observación de las acciones que efectúan los escaladores en su ascenso y analizar la influencia de la lateralidad y del nivel técnico del escalador sobre la ejecución motriz y por tanto, sobre el rendimiento. La muestra del estudio está compuesta por 54 suje- tos que participaron en...

The main aim of the current study was to determine the effectiveness of two strength training for climbing. 30 healthy men participated in the present study, and they were randomly divided into three groups: control group (GC) (n=10), maximal strength training group (GFM) and endurance-strength training group (GFR). The three groups trained three d...

p class="resumenyabstract" align="justify">The purpose of the current study was to determine whether a strength endurance training program of lower limbs isolate can increase endurance levels, both aerobic capacity and aerobic power, in order to adapt the strength training for endurance races. 20 phisically active men participated in the study. The...

Comunicación en el IV Congreso Internacional y XXV Nacional de Educación Física (Córdoba , 2-5 de abril de 2008): ”los hombres enseñando aprenden”. Séneca (Epst. 7,8), 2008

Resumen El objetivo del estudio es determinar el perfil antropométrico de las jugadoras de baloncesto en España en función del nivel competitivo y del puesto específico de juego. La muestra se compone de 64 jugadoras de baloncesto pertenecientes a equipos federados de la Liga Femenina de Baloncesto (n=20), Liga Femenina 2 de Baloncesto (n=22) y Pri...

resumen Se considera que el radar es un buen instrumento de medida, aunque sus aplicaciones en actividad física y deporte son escasas. El presente estudio trata de validar un protocolo de medición basado en el radar comparándolo con un criterio de referencia utilizado habitualmente (fotogrametría), en este caso aplicado a la velocidad en el golpeo...

El presente estudio pretende comprobar que el trabajo aislado de la fuerza resistencia en miembros inferiores produce una mejora de los niveles de resistencia, en términos tanto de potencia como de capacidad aeróbica, optimizando así el entrenamiento de la fuerza para pruebas de resistencia de media y larga duración. Para ello, veinte sujetos parti...

El objetivo del estudio es determinar el perfil antropométrico de las jugadoras de baloncesto en España en función del nivel competitivo y del puesto específico de juego. La muestra se compone de 64 jugadoras de baloncesto pertenecientes a equipos federados de la Liga Femenina de Baloncesto (n=20), Liga Femenina 2 de Baloncesto (n=22) y Primera Nac...

INTRODUCCIÓN El rendimiento en fútbol es multifactorial y depende de los planos técnico, táctico, físico, fisiológico y psicológico, (Stolen et al., 2005; Vescovi et al., 2006). El objetivo principal de nuestro estudio es analizar las diferencias existentes en variables antropométricas, de fuerza explosiva y de golpeo de balón en función de la posi...

INTRODUCCIÓN Son numerosos los trabajos publicados sobre las características antropométricas y el somatotipo en jugadores/as de baloncesto de nivel internacional [1,2]. Sin embargo, son escasos los estudios que hacen referencia a jugadoras de baloncesto en España. El objetivo principal del presente trabajo es efectuar un análisis descriptivo de las...

En el presente trabajo se ha efectuado un análisis de diferentes factores de rendimiento, antropométricos y físico-técnicos, en 190 mujeres futbolistas de dos niveles competitivos diferentes. Los objetivos del trabajo eran: por un lado establecer y valorar las diferencias existentes en esas variables en función del nivel competitivo y, por otro lad...

En el presente trabajo se ha efectuado el análisis de diferentes variables de los factores de rendimiento, antropométricos y físico-técnicos, en 82 futbolistas jóvenes de ambos sexos. Los objetivos del estudio fueron, por una parte establecer y valorar las diferen- cias existentes en las variables analizadas teniendo en cuenta la posición habitual...