Examinando por Autor "Paredes-Arias, Marcelo"
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Ítem Anthropometric characterization and physical performance by age and biological maturation in young tennis players(MDPI, 2021-10-02) Luna-Villouta, Pablo; Paredes-Arias, Marcelo; Flores-Rivera, Carol; Hernández-Mosqueira, Claudio; de Carvalho, Ricardo Souza; Faúndez-Casanova, César; Vásquez-Gómez, Jaime; Vargas-Vitoria, RodrigoThe objective was to analyze anthropometric and physical performance variables as a function of chronological age and biological maturity in young Chilean tennis players. The study was observational, cross-sectional, with descriptive and analytical characteristics. Eighty-seven tennis players were evaluated (58 men 15.1 ± 0.8 years and 29 women, 15.3 ± 0.8 years). The measured anthropometric variables were a sprint test of 20m; a modified agility test; a sit-and-reach test and shoulder flexibility; manual grip strength; horizontal jump in feet; a medicine ball throw; a countermovement vertical jump; an abalakov vertical jump and a 20-m shuttle-run test. The growth velocity acceleration peak (APHV), skeletal muscle mass and fat mass were calculated, R2 and standard error of estimate (SEE) were examined. The results show that chronological age explained the anthropometric variables between 1 and 23% in men and 1 and 29% in women; by biological age, variables were explained between 3 and 53% in men and 2 and 42% in women. Of the physical performance variables, chronological age described between 2 and 24% of them in men and 1 and 29% in women; the same were explained by biological age between 1 and 19% in men and 1 and 26% in women. We conclude that anthropometric variables showed a better relationship with biological age, except for volume of fat tissue, while physical performance variables showed low association with both biological and chronological age. © 2021 by the authors. Licensee MDPI, Basel, Switzerland.Ítem Association of agility with body composition and lower-extremity explosive muscle strength in young female tennis players(Federacion Espanola de Docentes de Educacion Fisica, 2023-02) Luna-Villouta, Pablo; Flores-Rivera, Carol; Paredes-Arias, Marcelo; Vásquez-Gómez, Jaime; Matus-Castillo, Carlos; Hernández-Mosqueira, Claudio; Hermosilla, Néstor Jofré; Vitoria, Rodrigo VargasThe objective of the research was to analyze the relationship between agility indicators with body composition and lower-extremity explosive muscle strength in young female tennis players. The study was observational, cross-sectional, correlational, and with descriptive characteristics. The sample consisted of 22 young Chilean tennis players (15.3±0.7 years old), selected in a non-probabilistic sampling for convenience. Anthropometric variables of weight, height, skin folds (triceps brachial, anterior thigh, and medial leg) and perimeters (arm, thigh, and leg) were measured. Body fat percentage (GC) and skeletal muscle mass (MME) were calculated. In addition, physical performance tests were applied; 505 with stationary start test (505), modified agility test (MAT), horizontal jump (SH), countermovement jump (CMJ) and Abalakov jump (ABK). The results showed that the agility tests (MAT and 505 tests) are better associated with the SH, 505 test (R2= 34% p<0.01) and MAT test (R2= 22%; p<0.05), in addition, for each centimeter of increase in the SH there is a decrease in the execution time of both agility tests (β=-0.02 s). On the other hand, the MME, GC, CMJ and ABK, do not show significant relationships with agility (p>0.05). It is concluded that agility shows a better association with the SH test in young Chilean tennis players, so that agility tests (505 and MAT) could be a specific method of evaluation in female tennis players. © Copyright: Federación Española de Asociaciones de Docentes de Educación Física (FEADEF).Ítem Effects of a Six-Week International Tour on the Physical Performance and Body Composition of Young Chilean Tennis Players(MDPI, 2023-01) Luna-Villouta, Pablo; Paredes-Arias, Marcelo; Flores-Rivera, Carol; Hernández-Mosqueira, Claudio; Vásquez-Gómez, Jaime; Matus-Castillo, Carlos; Zapata-Lamana, Rafael; Faúndez-Casanova, César; Jofré Hermosilla, Néstor; Villar-Cavieres, Natalia; Vargas-Vitoria, RodrigoIn tennis, it is common for young male tennis players to spend several weeks away from their local training camps during the competition season, which could affect their performance. The purpose of the study was to analyze the effects of a six-week international tour on physical performance and body composition in young Chilean tennis players. Twenty-four men between the ages of 14 and 16 participated in this research. In body composition and anthropometric measurement, body weight, height, skinfolds, and perimeters were measured. Body fat percentage (BFP) and skeletal muscle mass (SMM) were calculated. For physical performance, 5-m and 10-m sprints, modified agility test (MAT test), countermovement jump (CMJ), and medicine ball throw (MBT) were evaluated. Results show that, in body composition, BFP and SMM significantly decreased post-tour (p < 0.05; effect sizes ranging from 0.23 to 0.33, respectively). In physical performance, agility and 5-m and 10-m sprints significantly decreased (p < 0.05, effect sizes ranging from −0.63 to 1.10). We conclude that after a six-week international tour, BFP, SMM, agility, and speed (linear sprint) tend to decrease significantly, with a greater effect in the sprint tests. © 2023 by the authors.