Alejandro Rodriguez-Fernandez

University of Leon | UNILEON

El fútbol sala está considerado un deporte intermitente, donde el jugador precisa realizar esfuerzos de alta intensidad (componente neuromuscular y anaeróbico) y optimizar los procesos de recuperación (componente aeróbico). Si el entrenamiento puede optimizar estas capacidades, se desconoce cómo el desentrenamiento puede afectar a las mismas. Por e...

The study aimed to assess the immediate effects of re-warm-up strategies using half-squats with elastic looped bands on the performance of youth soccer players. A cross-over study design with repeated measures was implemented in field youth male soccer players (n = 20, age 15.7 ± 0.8 years). Following the first 45-min of match play, players were su...

El propósito de nuestra investigación fue analizar la efectividad del tiro en baloncesto 3x3 después de un rebote ofensivo. Se analizaron un total de 16,136 posesiones correspondientes a 350 partidos en 18 competiciones diferentes. Las variables recopiladas fueron las siguientes: (1) tiro a canasta después de un rebote ofensivo; (2) efectividad en...

El objetivo principal de este estudio fue de analizar los efectos del desentrenamiento en función del nivel inicial de condición física determinado a través del Total Score of Athleticism (TSA) en jugadoras de fútbol. Catorce jugadoras de fútbol realizaron una evaluación pre y post periodo de desentrenamiento (i.e., 2 semanas) consistente en un tes...

We aimed to (1) compare external training loads obtained in futsal players during pre-season and in-season training weeks to explore how these loads are periodized by the coaching staff; and (2) compare the external training loads using the match day minus approach during the pre-season and in-season periods to determine how the within-microcycle t...

Basketball demands a sophisticated blend of tactical, technical, physical, and psychological skills, and various methods have been proposed to prepare players for these demands, including re-sistance training to enhance strength, power, speed, agility, and endurance. Complex training (CT) integrates diverse strength training methodologies by combin...

Background Maximal strength may contribute to soccer players’ performance. Several resistance training modalities offer the potential to improve maximal strength. During recent years, a large number of plyometric jump training (PJT) studies showed evidence for maximal strength improvements in soccer players. However, a comprehensive summary of the...

Background: Classification of athletes in cerebral palsy (CP) football is a key action that aims to promote the participation of all players by minimizing the impact of their physical disabilities on the outcome of the competition by establishing sports classes. As such, a new research line has been included in the classification process at an inte...

The aim of this study was to examine the peak locomotor demands of match play and determine if these situations are replicated in training, and analyze their dynamics throughout the competitive microcycle in professional female soccer players based on their positions. Measurements such as distance covered (DIS), high-speed running distance (HSRD),...

The aim was to analyze the effect of two activation protocols based on exercises with bodyweight and elastic bands on the improvement of muscle power. Ten male university students of Physical Activity and Sports Sciences (age: 23.1±1.5 years) randomly completed with 48 hours of recovery between sessions, a control situation without warm-up (CON) an...

Background: Small-sided games (SSG) are among the most frequently used training drill in soccer. Aim: to investigate if the type of game (i.e., game with goalkeepers vs. possession games without goalkeepers) and wildcard type (i.e., without vs. internal vs. external wildcard) impact the physiological (i.e., heart rate) and locomotor (i.e., total d...

This study aimed to compare the effects of an 8-week short-term training program, comprising repeated sprints or running-based high-intensity intermittent training (HIIT), on the aerobic fitness and repeated sprint ability (RSA) performance of sub-elite basketball referees. Twenty male referees participated in supervised training sessions twice a w...

Objective: To compare the physical performance and official match demands of soccer players following a warm-up session that involved small-sided games with weighted vests of varying loads. Equipment and methods: This study involved fifteen highly trained male soccer players (age: 17.8 ± 0.5 years; height: 173.4 ± 6.3 cm; body mass: 66.1 ± 7.4 kg;...

Introduction: Huntington´s disease (HD) is a rare neurodegenerative disorder. Reliable information about nutritional status, especially body composition from individuals with HD is critical for clinical care and research. The ease of application and portability of multiple frequencies bioelectrical impedance analysis (mfBIA) make it an attractive t...

The validity of small-sided games (SSG) for assessing physical fitness was evaluated in 21 female basketball players from senior (n = 8), under-18 years (n = 6), and under-16 years (n = 7) age categories. Players underwent fitness testing (countermovement jump [CMJ], agility T-test, repeated-sprint ability (RSA) test, and Yo-Yo Intermittent Recover...

Explicación del proceso de evaluación en la LOMLOE, desde el enfoque competencial más general hasta las situaciones de aprendizaje, que en este caso se centra en una relacionadas con las acrobacias y su contextualización en el Día de la Educación Física en la Calle. Se presenta el proceso de evaluación de la misma.

Background: In soccer, the day of the week with the highest external load is match day (MD), with starters (>60 minutes per match) showing higher levels of physical fitness and seasonal high-intensity loading. It is necessary, therefore, to determine training strategies to reduce the differences between starters and nonstarters. The aim of this st...

Purpose This study compares the effects of 6 weeks of pre-season cardiopulmonary- vs. neuromuscular-based high-intensity interval training (HIIT) in female basketball players’ physical fitness. Methods Overall, 16 female regional-level U19 basketball players were randomly allocated to a cardiopulmonary-based HIIT (C-HIIT) group ( n = 8; age: 17.9...

The aim was to examine inter-system and inter-unit reliability of both WIMU PRO (UWB) and Polar Team Pro devices in measuring indoor sport-specific movements. Seventeen active and healthy adults (age: 21.4 ± 5.2 years; height 170.3 ± 8.2 cm; body mass: 71.2 ± 4.5 kg) completed one repetition of an indoor team sport circuit (i.e. accelerations, dece...

Accelerometers can estimate the intensity, frequency, and duration of physical activity in healthy adults. Although thresholds to distinguish varying levels of activity intensity using the Actigraph wGT3X-B have been established for the general population, their accuracy for Huntington’s disease (HD) is unknown. We aimed to define and cross-validat...

El objetivo fue analizar el efecto de la edad sobre las demandas físicas y fisiológicas de juegos reducidos con diferente espacio individual de interacción. Treinta jugadores de edad sub-12 (U12: n=10; edad, 11.2  0.8 años; altura, 145.4  6.4 cm; masa corporal, 37.5  3.9 kg), sub-14 (U14: n=10; edad, 13.5  0.6 años; altura, 163.7  5.9 cm; masa...

The current study aimed to analyse the effects of an in-season break period (2-week) on specific performance in amateur young female soccer players. Twelve female soccer players completed four assessment sessions, two before (BD-d1 and BD-d2) and two after (AD-d1 and AD-d2) a 2-week in-season break detraining period (both separated by 24 h). In eac...

Background Consumer and research activity monitors have become popular because of their ability to quantify energy expenditure (EE) in free-living conditions in a cost-efficient way. However, there is not research on the validity of this devices in people with Huntington’s disease (HD). Aims To determine the accuracy of the Actigraph and Fitbit co...

Rationale Risk for or established malnutrition is frequent in Huntington´s disease (HD), accompanied by functional limitations, increased morbidity, and mortality. Phase angle is associate with changes in the structure of the cell membrane of soft tissue mass, alterations in fluid balance and it has been shown as an indicator of prognostic clinic i...

Rationale Sarcopenia is associated with frailty, and dependence in older patients. Mediterranean Diet (MeDi) is one of the best models for healthy eating, associated with a better life quality in Huntington´s disease (HD). Targeted physical activity intervention has been identified as beneficial in several health disorders, including sarcopenia. Ou...

Background Thermoregulation is the maintenance of a relatively constant core body temperature which influences tolerance to physical activity. Brown adipose tissue, skeletal muscle, and hypothalamus are components involved in this process. Transgenic animal models of Huntington’s disease (HD) have provided informative models of thermoregulatory dis...

BACKGROUND Among the different clinical manifestations, weight loss and energy balance (EB) deficit have been described frequently in Huntington's disease (HD), contributing to HD progression. To develop a therapeutic approach to prevent weight loss and EB deficit in HD, we will conduct a study designed to validate the usefulness of accelerometers...

This study analyzes the inter- and intra-differences in external load across the microcycle in professional female soccer players. External load during four consecutive microcycles (i.e., M1, M2, M3, and M4) and training sessions (i.e., MD-4, MD-3, MD-2, and MD-1) and a match day (i.e., MD) were registered in seventeen female professional soccer pl...

El objetivo fue analizar los efectos de la suplementación con zumo de remolacha (ZR) sobre el rendimiento deportivo en triatletas amateur, medido mediante un protocolo de media sentadilla bilateral y unilateral, y con una prueba de salto con contramovimiento (CMJ), en situación de fatiga. Doce triatletas amateurs participaron en este estudio aleato...

Repeated sprint training appears to be an efficient strategy for the simultaneous development of different fitness components in intermittent sport. The aim of this study was to analyze the effects of implement training with repeated sprint training on repeated sprint ability (RSA), reaction time in fatigue condition and jump height. Twenty-seven y...

The aim of this study was to quantify the acute impact of bouts duration and individual interaction space on physical and physiological demands and on physical performance. Ten young male soccer players (age: 14.8 ± 0.6 years) from the same team playing in the National U-16 Division participated. Physical (total distance [TD]; distance covered at d...

This study analyzed the effects of a training program based on Nordic Hamstring and sprint exercises on physical performance and hamstring injuries in young male soccer players. Forty-nine U19 players were randomly assigned to a control (CG; n = 26) or experimental group (EG; n = 23). Linear sprint and with change of direction (COD) were assessed b...

Recent classifications of resistance training methods classify them in gravitational, to move the resistance we will have to apply an acceleration greater than the force of the gravity (9.81 m·s⁻¹), and non-gravitational methods that allow us to work in multiple directions, not being exclusively conditioned by gravity. Bodyweights training, also kn...

The aim of the study was to analyze variations in performance and subjective perception of well-being in young soccer players between menstrual (FM), follicular (FF) and luteal (FL) phases. Twelve female soccer players participated (16.18 ± 1.68 years; 164 ± 7.27 cm; 61.90 ± 6.37 kg) with 4 years of competitive experience and 3.1 ± 1 years with reg...

This study aimed to analyze the influence of the different contextual factors (i.e., defensive style and game outcome) on the basketball players’ external load during games-based drills using ultrawideband (UWB) technology. Fourteen male professional basketball players belonging to an elite reserve Spanish Club (ACB) participated in this study. The...

Background Body composition is a strong indicator of nutritional and health status. Dual energy X-ray absorptiometry (DXA), multifrecuency bioelectrical impedance analysis (BIA), anthropometry and, skinfolds are non invasive methods to assess body composition with different levels of reliability. The validity of anthropometric and skinfolds to esti...

Power output is considered one of the best tools to control external loads in cycling, but the relationship between a target power output and the physiological responses may suffer from the effects of road gradient, which is also affected by cyclist specialization. The objective of this study was to determine the effects of cyclist specialization o...

The purpose of this study was to investigate the relationship between physical fitness and external load determined by local positioning system (LPS) in a simulated basketball game. Fourteen professional male basketball players performed a lane agility drill, 20-m maximal sprint speed, countermovement jump (CMJ), drop jump, and repeated sprint test...

Small-sided games (SSGs) are a useful strategy to optimize the training process in soccer. The modification of some variables simultaneously implies several physical adaptations in soccer players. Thus, the aim of this study was to analyze the differences in the physical demands encountered by soccer players in different SSGs formats focusing on th...

The aim of this study was to analyze the effect of different supplementation conditions on the flywheel half-squat fatigue and performance. Sixteen active males participated in the experimental intervention during a 4-week period. Four experimental conditions were stablished in a double-blind manner as follows: placebo, caffeine (CAF), beetroot jui...

Purpose: To examine the effects of acute caffeine supplementation on physical performance during fitness testing and activity during simulated games in basketball players. Methods: A double-blind, counterbalanced, randomized, crossover study design was followed. A total of 14 professional male basketball players ingested a placebo (sucrose) and...

Objective Beetroot juice (BJ) supplementation has been reported to enhance skeletal muscle contractile function; however, it is currently unclear whether BJ supplementation elicits comparable improvements in power output during different types of skeletal muscle contractions. The purpose of the current study was to assess the effect of BJ supplemen...

El objetivo del presente estudio fue analizar el efecto de cuatro protocolos de activación pre-competición basados en contracciones excéntricas sobre el tiempo en 25-m de estilo libre en natación. Diez nadadores (20,8  4,7 años de edad; 175,2  9,3 cm de altura; 66,4  10,4 kg de peso) que competían en categoría nacional participaron en el estudio...

El objetivo del presente estudio fue analizar la relación entre la altura de salto con contramovimiento (es decir, CMJ) y la carga externa registrada por jugadores de baloncesto profesionales y en su rendimiento deportivo (es decir, ganador del cuarto) durante partidos simulados. Catorce jugadores masculinos de baloncesto realizaron el test CMJ med...

The aim of this study was to analyse the effects of two short-term training programs to prevent the negative effect of detraining on repeated sprint ability (RSA) performance. The study was carried out during a 2-wk midseason break without official matches. Forty-five youth soccer players (17.7 ± 0.8 yr, 175.4 ± 5.5 cm and 67.2 ± 5.1 kg) were split...

Aerobic fitness is a decisive performance factor in soccer players. Previous studies have correlated the distance travelled in an intervallic test (Yo-Yo IR test) with the distance covered in competition, demonstrating that a high aerobic capacity contributes to better recovery in high intensity intermittent exercises typical of training and soccer...

Background Several studies investigated the effects of caffeine supplementation on movement velocity in resistance exercise. However, these studies presented inconsistent findings. Objective This paper aimed to: (a) review the studies that explored the effects of caffeine supplementation on movement velocity in resistance exercise; and (b) pool th...

Este estudio piloto busca evaluar la validez de las mediciones de los indicadores de calidad del sueño en la Fitbit Flex® en su modo Normal (FF), un dispositivo comercial que permite la medición la actividad diaria y el sueño en el día a día, comparándolos registros con los del Actigraph GR3X®, (considerado el Gold Standard en la evaluación de la c...

Objectives: the cardiorespiratory fitness and the intensity of effort were analyzed during the recreational practice of slalom water skiing. Methodology: three moderately active water skiers with paraplegia participated. They performed an incremental test on an arm ergometer to determine their VO2peak and ventilatory thresholds and completed 3 sess...

The aim of this study was to assess the effect of an 8-week repeated sprint with change of direction training program on repeated sprint, intermittent endurance and change of direction performance in youth soccer players with different aerobic fitness level. Athletes were randomly assigned into a soccer-only (n=9; age, 14.9±0.4 yr) and soccer plus...

Despite the demonstrated evidence of the importance of eccentric contractions in sports performance, no research has evaluated the ergogenic effects of caffeine on this type of contraction means during flywheel exercises. Therefore, the aims of the present study were to compare the power outcomes, using different inertial loads, between caffeine an...

The principal aim of this study was to analyze the possible relationship between the variables of performance described by literature and the race result and points ranking of the Spanish Federation of winter sports (RFEDI), in an official competition of downhill skiing in the categories U14 and U16.

The aim of this study was to compare changes in young soccer player’s fitness after traditional bilateral vs. unilateral combined plyometric and strength training. Male athletes were randomly divided in two groups; both received the same training, including strength training for knee extensors and flexors, in addition to horizontal plyometric train...

Aim: The aim of this study was to assess the external load of amateur male players during 4 consecutive training microcycles (M) at the beginning of the in-season according to the training session in absolute external load demands and in relation to the competition demands. Methods: Regional-level players (n = 10; age, 20.8 ± 1.7 years; height, 17...

To better understand the detraining effects in soccer, the purpose of the study was to analyse if performance level of soccer players modulate repeated-sprint ability (RSA) and intermittent endurance changes during 2-weeks of detraining (i.e., in-season break). Seventeen professional and sixteen young elite soccer players of two different teams per...

The aim of this study was to analyze the association between sprint ability and endurance capacity in soccer referees. Twenty-three Spanish officials participated in this study. Each referee undertook, in this order, a 40 m linear straight sprinting test (40 m Sprint) and the Yo-Yo intermittent recovery level 1 test (YYIR1) interspersed with a 8 mi...

The aim of this study was to compare changes in young soccer player's fitness after traditional bilateral vs. unilateral combined plyometric and strength training. Male athletes were randomly divided in two groups; both received the same training, including strength training for knee extensors and flexors, in addition to horizontal plyometric train...

Technical staff use friendly matches to get players to official matches in the proper performance physical shape during the pre-season period to ensure an optimal physical conditioning during in-season. Purpose: The aims of this study were: a) to describe the perceived exertion of soccer players in the pre-season and in-season periods; and b) to an...

To investigate the relationship between repeated sprint ability (RSA) and several aerobic and anaerobic-related soccer-performance indicators, 45 youth soccer players (age 16.8±0.1 y) were classified into “high” (HAF) or “low” (LAF) aerobic fitness (VO2max  or <60 mL∙kg-1∙min-1, respectively) and completed a RSA test measuring best (RSAbest), mean...

This study aimed to compare the effects of a traditional warm-up with two post-activation potentiation (PAP) warm-up strategies on the repeated sprint ability (RSA) of soccer players with national (NL) and regional (RL) competitive levels. Sixteen young players (NL, n = 8, age = 20.7±1.4 y, body mass = 68.5±7.0 kg, height = 177.4±5.2 cm; RL, n = 8,...

Numerous studies have analyzed during competitive season different conditioning programs to improve soccer players' repeat sprint ability (RSA). However, few studies have focused on analysing what happens with this ability after small-sided games (SSG)-based training. Thus, the aim of this study was to determine the changes in physical performance...

El objetivo de este trabajo ha sido comparar el efecto de tres calentamientos diferentes (calentamiento aeróbico de baja intensidad, estiramiento estático y estiramiento dinámico) sobre el salto horizontal y la capacidad de repetir esprint con cambios de dirección. Diecisiete practicantes de deportes de equipo de 20.8±1.1 años realizaron 3 tipos de...

Los deportes de equipo se caracterizan por demandar a los jugadores la realización de esfuerzos máximos o submáximos, entre los cuales se producen periodos de recuperación. La capacidad de repetir estos esfuerzos, se denomina “repeat sprint ability” o RSA y es considerada determinante en el rendimiento en estos deportes. Por lo tanto, definir las e...

RESUMEN: Preparadores físicos y científicos del deporte han aceptado la hipótesis de que el calentamiento proporciona muchos beneficios fisiológicos. Estas ventajas tradicionalmente han sido conseguidas incluyendo actividades aeróbicas, estiramientos estáticos, estiramientos dinámicos y ejercicios de carácter neuromuscular con el objetivo de preven...

El objetivo del estudio fue analizar el efecto de un entrenamiento con sprints lineales y con sprints que incluyen cambios de dirección (2-COD-90º), sobre el rendimiento de jugadores juveniles de fútbol que compiten en categoría provincial. Dieciséis jugadores (media ± SD: 16.7±.8 años de edad; 175.3±5.2 cm de altura; 64.4±9.4 kg de peso) fueron as...