Artículos Científicos

URI permanente para esta colecciónhttp://10.0.96.45:4000/handle/11056/13682

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A Principal Component Analysis in futsal according to game halves: A case study of an amateur futsal cup final
(Universidad Nacional, 2021-06) Rico-González, Markel; Los Arcos, Asier; Rojas -Valverde, Daniel; Pino Ortega, José
Principal Component Analysis (PCA) has not been used to assess the principal component (PC) of players´ external training loads (TL) in futsal. In addition, no previous study has analyzed the PC of players´ external TL depending on the half of the match in futsal. Thus, this study aimed to assess the PC of players´ external TL considering an entire official futsal match distinguishing by halves (1st and 2nd halves). Two teams of twelve amateur futsal players (Spanish 3rd division) participated in the final match of the futsal cup and external TL was quantified using eight antennas ultra-wideband technology. Through PCA statistical analysis, 10 variables formed the 10 PC. Specifically, three PC for the entire match, four for the 1st half, and three for the 2nd half were extracted. Considering the match as a whole,three PC explained the players´ external TL formed by eight variables: distance covered (m/min), distance covered at high speed running (m/min), distance covered at explosive speed (m/min), total accelerations (n/min), total decelerations between 2-1 m/s/s (n/min), distance covered at 24-50 km/h (m/min), total impacts between 8-100g (n/min) and Jumps performed (n/min). The PC variables differed between halves: a) in the 1st half 74.5% was explained by four PC composed of 8 variables in total, and b) in the 2nd half 67.6% was explained by three PC. The results suggest that the use of only one PC could potentially lead to an underestimation of the external TL demands in futsal matches. It seems that a combination of 3-4 PC from a total of 8 to 10 variables are required to explain senior amateur futsal official games. In addition, the match half should be considered to assess the external TL in team sports.
A Systematic Review of the Effects of Football Playing on Changes in Serum Brain-Derived Neurotrophic Factor Level
(MDPI, 2021-12-13) Gutierrez-Vargas, Randall; Ugalde-Ramírez, Jose Alexis; Rico-González, Markel; Pino Ortega, José; González Hernández, Juan; Rojas-Valverde, Daniel
Antecedentes: Pruebas consistentes sugieren que el ejercicio mejora la cognición y la toma de decisiones, con pruebas preliminares que sugieren que los factores neurotróficos derivados del cerebro (BDNF) pueden mediar estos efectos en actividades de intervalos de alta intensidad, como en la práctica del fútbol. Se realizó una revisión sistemática de estudios sobre jugadores de fútbol o intervenciones en tareas futbolísticas que evaluaran la causalidad del ejercicio o su relación con cambios en el nivel basal de BDNF. Métodos: La búsqueda se realizó en PubMed, SPORTDiscus, Cochrane y FECYT (Web of Sciences, CCC, DIIDW, KJD, MEDLINE, RSCI y SCIELO) de acuerdo con las directrices para la realización de revisiones sistemáticas en el ámbito de las ciencias del deporte. Resultados: De los 44 estudios identificados inicialmente, se revisaron siete en su totalidad y se extrajeron y analizaron sus medidas de resultado. En el estudio científico del fútbol, los estudios publicados hasta la fecha han explorado la relación de los niveles séricos de BDNF y otros factores de la función cognitiva con la expresión genética de polimorfismos, las condiciones antropométricas y de forma física, el efecto de ejercicio agudo del partido y las acciones típicas del partido como el remate de cabeza. Conclusiones: La heterogeneidad de diseños y variables evaluadas en los estudios relacionados con el ejercicio o interacción del BDNF y la práctica del fútbol no permite determinar de forma concluyente que exista una relación con la causa o efecto de factores genéticos, antropométricos o condicionales que deriven en un aumento del BDNF por acciones durante la práctica del fútbol.
Agreement and reliability of neuromuscular and cognitive test based on light stimuli to assess integrative reaction time in sports
(Universidad Nacional, 2020) Gutiérrez Vargas, Randall; Ugalde Ramírez, José Alexis; Sánchez Ureña, Braulio; Ulloa Sandí, Ana; Gutiérrez Vargas, Juan Carlos; Rojas Valverde, Daniel
Reaction in team sports involves a series of systemic processes integrating functions to develop a response considering situation, time and space. The aim of this study was to analyze the agreement and reliability of a neuromuscular and cognitive test based on light stimuli to assess integrative reaction time in sports. Fourteen active participants performed two sessions with 10 repetitions of the NeuroPhys Sport Reaction Test (NPSRT). The test showed moderate to almost perfect reliability (intraclass correlation coefficient= 0.53-0.81) and good agreement (Bland-Altman Method, BIAS= -0.0004-0.029) between sessions; there were no absolute mean differences between sessions (repeated measures t-test= p≤ 0.050) and presented moderate to high lineal correlations (Pearson r= 0.53-0.83, p≤ 0.05). The NPSRT could be considered as a reliable test to assess reaction time in team sports.
Editorial: New technologies and statistical models applied to sports and exercise science research: methodological, technical and practical considerations
(Universidad Nacional, Costa Rica, 2023) Rojas-Valverde, Daniel; Gómez-Ruano, Miguel A.; Ibañez, Sergio J; Nikolaidis, Pantelis T.
External and Internal Load of Costa Rican Hanball Referees According to Sex and Game Periods
(Universidad Nacional, 2021) Gutiérrez Vargas, Randall; Ugalde Ramírez, José Alexis; Rojas Valverde, Daniel; Müller Thyssen, María; Pino Ortega, José
The purpose of this study was to analyze the external and internal load of Costa Rican handball referees according to sex and game periods. Nine referees (6 men and 3 women) were monitored during U19 handball matches, using an ultra-wide band local positioning system (UWB) and WIMUPro™ inertial units (IMU). The results showed a total distance of 4566.54±494.02 m (46.95% at 0-6 km/h, 32.97% at 6-12 km/h, 18.11% at 12-18 km/h and 1.96% >18 km/h). 1298.34±151.42 m/s2 accelerations and 1297.73±152.09 m/s2 decelerations were performed. Maximal speed was 19.63±1.85 km/h and average speed was 4.80±0.34 km/h. Player LoadRT was 50.53±9.39 UA. Maximal and average heart rate was 170.59±18.20 bpm 143.06±16.94 bpm respectively. 60% of the efforts were <80% of maximum heart rate. Total energy expenditure was 372.34±67.80 kcal. No significant differences were found in physiological variables between sexes, although men covered greater distance at 0-6 km/h. In the second periods the total distance (m/min), distance at 6-12 km/h, 12-18 km/h (m/min) and >18 km/h, average speed, impacts at 3-5g and >5g, Player LoadRT, and energy expenditure decreased. In conclusion, sex does not seem to affect the external or internal load, while the game period influenced on the external load.
Future Challenges in the Assessment of Proprioception in Exercise Sciences: is Imitation an Alternative?
(Frontiers, 2021-06-02) Munóz-Jiménez, Jesús; Rojas-Valverde, Daniel; Leon, Kiko
To perform any body movement, a series of sensory processes are required that provide the necessary information. Once this sensory data is integrated at the cortical level, an optimal response is given considering but not limited to space and time. This neuromotor coordination results in a synergic, intentional, and synchronic action. Voluntary movements require a coordinated and efficient muscle contraction mediated by the central nervous system integration processes (Tuthill and Azim, 2018). To do so, the cerebellum and brain regulate the sensitive data obtained from a multi-model sensory system. In the case of corporeal control or body control, it is required information from the somatosensory sense as the one that gives information from the “inside” of the body (ten Donkelaar et al., 2020). Once the body interacts with the environment in time and space, this body control needs the ocular, vestibular, tact, and auditory exteroceptive senses to obtain information from the context. This is how the term spatio-temporal body control could be used.
Specialization or Diversification in Sports Development: An Integrative Review
(Universidad Nacional, Costa Rica., 2024) Rojas Valverde, Daniel; Azofeifa Mora, Christian; Herrera Monge, María Fernanda; Herrera González, Emmanuel; Fallas Campos, Andrea
Objetivo: Explorar y discutir literatura científica teórica y práctica para comparar la diversificación y la especialización deportivas tempranas como un enfoque deportivo y educativo. Métodos: Se realizó una revisión sistemática siguiendo las pautas PRISMA, se incluyó un total de 61 estudios. Resultados: Entrenadores, padres e hijos consideran que la mejor forma de desarrollar el talento deportivo y alcanzar la élite en el deporte es participar en una sola disciplina y hacerlo lo antes posible para lograr la especialización y las máximas habilidades técnicas, físicas y psicológicas. Los caminos de especialización deportiva pueden conducir a una situación física, social y mental que comprometa su desarrollo integral.Conclusión: Se puede plantear, en primer lugar, la diversificación deportiva en edades tempranas y luego la especialización; una vez alcanzadas las bases de la fuerza, el acondicionamiento y el entrenamiento neuromuscular, así como una maduración psicomotora específica, para que su rendimiento deportivo y su salud no se vean comprometidos en el mediano o largo plazo. Es necesario considerar que pocos niños logran obtener un lugar en los deportes de élite, por lo que, para muchos de ellos, la educación en torno al deporte será la base para el ejercicio de su ciudadanía como personas activas.

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Examinando Artículos Científicos por browse.metadata.procedence "Escuela Ciencias del Movimiento Humano y Calidad de Vida"