Browsing by Subject "Força"

Now showing 1 - 3 of 3
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    Creatine monohydrate ingestion-related placebo e effects on brief anaerobic exercise performance. A laboratory investigation
    (Murcia: Servicio de Publicaciones de la Universidad de Murcia, 2017) Szabó, Attila; Szemerszky, R.; Dömötör, Z.; De la Vega, R.; Koteles, Ferenc
    ABSTRACT: People’s thoughts infuence their action that led researchers to inves- tigate the placebo efect in exercise performance. In the current study the pla- cebo efects of creatine monohydrate on a one-minute anaerobic step-exercise performance were examined in a double blind laboratory inquiry. University students (n = 79, 64.5% women) were randomly assigned to one of three expe- rimental conditions: 1) intervention (ingestion of 80 mg/kg dissolved creatine monohydrate, n = 26), 2) placebo (ingestion of dissolved corn starch, thought to be creatine, n = 26), and 3) no-intervention control (ingestion of drinking water only, n = 27). After a baseline measurement, participants have consumed their respective drinks and 40 minutes later the 1-minute exercise was repeated. While analysis of variance revealed no group level diferences in actual and perceived change in performance, the latter was linked to participants’ expec- tations regarding performance on the second exercise test in the correlation analysis. Two thirds of the participants in the current study believed that their performance would improve in the actual test-exercise. However, these expec- tations were not linked to creatine ingestion. Tese fndings suggest that (1) a single dose of creatine monohydrate does not afect anaerobic performance, (2) in low-challenge and low-subjective-importance “artifcial” research condi- tions sufcient expectations could not be evoked, and probably due to the lack of creatine-related expectations the placebo efects did not emerge.
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    Open Access
    Effects of a 10-week dry-land strength and conditioning program in physical capacities and start of previouslyfederated and regular swimming practitioners
    (Universidad de Murcia. Servicio de publicaciones, 2022) Silva, Carlos; Jesus, João; Vilarigues, Iuri; Aranha, Ivo; Candeias, Iuri; Santos, Fernando; Figueiredo, Teresa; Espada, Mário
    The aim of this study was to evaluate the effects of a 10-week strength and conditioning (S&C)program in physical capacities and start in previously federated and regular swimming practitioners. 16 swimmers (9 male, 17.00±2.16 years of age, 179.14±5.76 cm of height and 69.79±3.11 kg of weight; 7 female, 15.86±2.34 years of age, 163.86±4.98 cm of height and 60.19±3.60 kg of weigh) were equality, but randomly separated in two groups (control group and experimental group, CG and EG, respectively). In the pre-test, swimmers performed three starts in two different models, grab start and track start, the best start was registered. Kinematic parameters of the swimming start and time at 15 m were determined. Flexibility, countermovement jump and 3 kg medicine ball throw were also assessed. In post-test, 10-weeks after a regular 2-sessions week specific dry-land S&C program of 60 min was performed by the EG, all tests were repeated. Flexibility, strength and muscular power gains were significant in EG, contrarily to CG. Swimming start flight phase variables improved more in EG compared to CG, with specificities observed in grab and track start but not a linear consequence with performance in 15-m mark in both groups. A 10-week dry-land S&C program can provide benefits in physical capacities in regular swimming practitioners, fact that may improve the initial phase of the swimming start, prior to the underwater moment, which should deserve attention by the coaches in daily training aiming performance enhancement at 15 m.
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    Open Access
    Variación en la actividad física, condición física y competencia motora según el estado de peso de jóvenes de 12-15 años de Cabo Verde
    (Universidad de Murcia. Servicio de Publicaciones., 2022) Lopes, Otniel Joanyr Pereira Barbosa; Malina, Robert M; Lopes, Vitor Pires
    El objetivo: evaluar la actividad física (AF), aptitud física (ApF) y competencia motora (CM) entre jóvenes caboverdianos en relación con el estado de peso. La altura, peso, ApF (fuerza de prensión, flexiones de brazos, abdominales, sentarse-alcanzar, una milla de carrera/caminata), CM (KTK) yAF (podómetros) se midieron en 343 niños y niñas de 12-14 años. Se utilizó ANCOVA. AF y CM no variaron consistentemente con el estado de peso. La aptitud cardiorrespiratoria y la fuerza de prensión de las niñas delgadas fueron significativamente mejores que las de peso normal y con sobrepeso/obesidad. Los niños con bajo peso se desempeñaron significativamente mejor que los niños normales y con sobrepeso/obesidad. En conclusión, las diferencias entre los jóvenes por estado de peso no fueron evidentes, excepto en la aptitud cardiorrespiratoria en las niñas y la fuerza de prensión en ambos sexos. CM se diferenciaba por el estado de peso solo entre las niñas