Reaction time and defensive sliding test versus t-test: which is better? / Tiempo de reacción y prueba de deslizamiento defensivo contra t-test: ¿qué es mejor? / Tempo de reação e teste de deslizamento defensivo contra t-test: qual é melhor?

ABSTRACT Introduction: During basketball, players' movements represent a reaction to an unpredictable single or complex external stimulus (nonplanned agility). Objective: The present study aimed to compare the test of nonplanned agility to the planned agility test and to increase the knowledge of perception, decision-making, anticipation, and motor abilities of female basketball players. Methods: Thirty-six female basketball players (age: 18.81 ± 2.58 years) performed The Reaction Time and Defensive Sliding Test (RTADST) on the first day and the T-test the following day. Results: there were no statistically significant correlations between the RTADST and T-test at the whole sample level or between perimeter and post players. The T-test and Fat % correlation is significant at the 0.05 level, while the other analyzed correlations were insignificant. Perimeter players achieved better results on the RTADST test. There were no significant differences between perimeter and post players on the T-test. Conclusion: The RTADST and T-test are testing different abilities. We recommend the use of the RTADST to coaches and conditioning experts. Level of Evidence II; Diagnostic Study Investigating a Diagnostic Test.

RESUMEN Introducción: Durante el partido de baloncesto, los movimientos de los jugadores de baloncesto representan la reacción a un estímulo externo único o complejo impredecible (agilidad no planificada). Objetivo: El presente estudio tuvo como objetivo comparar la prueba de agilidad no planificada con la prueba de agilidad planificada y aumentar el conocimiento sobre la percepción, la toma de decisiones, la anticipación y las habilidades motoras de las jugadoras de baloncesto. Métodos: Las treinta y seis jugadoras de baloncesto (de la edad: 18.81 ± 2.58 años) realizaron la Prueba de tiempo de reacción y deslizamiento defensivo (RTADST) el primer día y el siguiente día la prueba T. Resultados obtenidos: no hubo correlaciones estadísticamente significativas entre el RTADST y la prueba T, a nivel de toda la muestra ni entre jugadoras del perímetro y del poste. La correlación entre la prueba T y el % de Grasa es significativa al nivel de 0,05, mientras que el resto de las correlaciones analizadas no resultaron significativas. Las jugadoras del perímetro lograron mejores resultados en la prueba RTADST. No hubo diferencias significativas entre las jugadoras del perímetro y las del poste en la prueba T. Conclusión: El RTADST y la prueba T están probando habilidades diferentes. Recomendamos el uso del RTADST a entrenadores y expertos en acondicionamiento. Nivel de Evidencia II; Estudio de Diagnóstico que Investiga una Prueba Diagnóstica.

RESUMO Introdução: Durante o basquete, os movimentos dos jogadores representam uma reação a um estímulo externo imprevisível, simples ou complexo (agilidade não planejada). Objetivo: O presente estudo teve como objetivo comparar o teste de agilidade não planejada com o teste de agilidade planejada no intuito de aumentar o conhecimento sobre percepção, tomada de decisão, antecipação e habilidades motoras em jogadoras de basquete. Métodos: Trinta e seis jogadoras de basquete (idade: 18,81 ± 2,58 anos) realizaram o Teste de Tempo de Reação e Deslizamento Defensivo (RTADST) no primeiro dia e o Teste T no dia seguinte. Resultados: não houve correlações estatisticamente significativas entre o RTADST e o teste T em toda a amostra ou entre jogadores de perímetro e de poste. A correlação entre o teste T e o percentual de gordura é significativa no nível de 0,05, enquanto as outras correlações analisadas foram insignificantes. Os jogadores de perímetro obtiveram melhores resultados no teste RTADST. Não houve diferenças significativas entre os jogadores de perímetro e de poste no teste T. Conclusões: O RTADST e o teste T estão testando habilidades diferentes. Recomendamos o uso do RTADST para treinadores e especialistas em condicionamento físico. Nível de Evidência II; Estudo de Diagnóstico que Investiga um Teste de Diagnóstico.

How Much Is Winning a Matter of Luck? A Comparison of 3 × 3 and 5v5 Basketball.

BACKGROUND: The comparison of team sports based on luck has a long tradition and remains unsolved. A contrast between the new Olympic format three-on-three (3 × 3) and five-on-five (5v5) forms of basketball has never been analyzed and provides a comparison within the same form of sports. METHODS: We developed a new method to calculate performance indicators for each team and invented the Relative Score Difference Index, a new competitive balance indicator that allows the comparison of luck in the two basketball forms for both men and women. We collected game-level data about 3 × 3 and 5v5 from the World Cups held between 2010 and 2019 (N = 666). Luck was defined as the difference between the expected and the actual outcomes of games. Using the basketball World Cup data, we applied the Surprise Index, ran probit regression models, and compared the basketball forms on the goodness-of-fit of the models. RESULTS: As we predicted, there are differential effects of luck between game formats and sex, such that the 3 × 3 form depends more on luck and women's games are less influenced by luck when compared to men's games. CONCLUSION: Coaches may better understand the differences between the two forms and sexes regarding luck if they are aware that the 3 × 3 and men's competitions are usually more influenced by luck. The findings provide a leverage point for testing new performances and competition balance indicators and will acknowledge the number of games we enjoy watching.

A Comparison of 5v5 and 3x3 Men's Basketball Regarding Shot Selection and Efficiency.

BACKGROUND: Both in 5v5 and 3x3 basketball, the goal of the players is to score more points than the opponent. However, the differences in rules between two basketball disciplines can affect thinking, behaviour, and decisions of the players. A core difference between two disciplines is the value of the shots. In 5v5, long-range shots are worth three points and close-range two, while in 3x3, their values are two and one points, respectively. As the value ratio of the close and long-range shots is greater in 3x3, we assume that players make different decisions about their shot selection in 3x3 than in 5v5, which can affect offensive efficiency. METHODS: We analysed game statistics of the 2019 men's 5v5 and 3x3 Basketball World Cups. Besides regular statistical indicators, we applied relative offensive rating to be able to compare the two disciplines. RESULTS: The analysis of relative offensive rating showed that offences are more effective in 5v5 than in 3x3. We also found significant difference in shot selection and efficiency. In 3x3, there is a higher proportion of the shots than in 5v5, but long-range shots are more successful in 5v5. CONCLUSIONS: For rule differences that affect player's shot selection and affect offensive efficiency, their decisions are characterized by ecological dynamics and naturalistic decision-making.

Tailoring the Spacer Arm for Covalent Immobilization of Candida antarctica Lipase B-Thermal Stabilization by Bisepoxide-Activated Aminoalkyl Resins in Continuous-Flow Reactors.

An efficient and easy-to-perform method was developed for immobilization of CaLB on mesoporous aminoalkyl polymer supports by bisepoxide activation. Polyacrylate resins (100-300 µm; ~50 nm pores) with different aminoalkyl functional groups (ethylamine: EA and hexylamine: HA) were modified with bisepoxides differing in the length, rigidity and hydrophobicity of the units linking the two epoxy functions. After immobilization, the different CaLB preparations were evaluated using the lipase-catalyzed kinetic resolution (KR) of racemic 1-phenylethanol (rac-1) in batch mode and in a continuous-flow reactor as well. Catalytic activity, enantiomer selectivity, recyclability, and the mechanical and long-term stability of CaLB immobilized on the various supports were tested. The most active CaLB preparation (on HA-resin activated with 1,6-hexanediol diglycidyl ether-HDGE) retained 90% of its initial activity after 13 consecutive reaction cycles or after 12 month of storage at 4 °C. The specific rate (rflow), enantiomer selectivity (E) and enantiomeric excess (ee) achievable with the best immobilized CaLB preparations were studied as a function of temperature in kinetic resolution of rac-1 performed in continuous-flow packed-bed bioreactors. The optimum temperature of the most active HA-HDGE CaLB in continuous-flow mode was 60 °C. Although CaLB immobilized on the glycerol diglycidyl ether (GDGE)-activated EA-resin was less active and less selective, a much higher optimum temperature (80 °C) was observed with this form in continuous-flow mode KR of rac-1.

Immobilization of Phenylalanine Ammonia-Lyase on Single-Walled Carbon Nanotubes for Stereoselective Biotransformations in Batch and Continuous-Flow Modes.

Carboxylated single-walled carbon nanotubes (SwCNTCOOH) were used as a support for the covalent immobilization of phenylalanine ammonia-lyase (PAL) from parsley by two different methods. The nanostructured biocatalysts (SwCNTCOOH-PALI and SwCNTCOOH-PALII) with low diffusional limitation were tested in the batch-mode kinetic resolution of racemic 2-amino-3-(thiophen-2-yl)propanoic acid (1) to yield a mixture of (R)-1 and (E)-3-(thiophen-2-yl)acrylic acid (2) and in ammonia addition to 2 to yield enantiopure (S)-1. SwCNTCOOH-PALII was a stable biocatalyst (>90 % of the original activity remained after six cycles with 1 and after three cycles in 6 m NH3 with 2). The study of ammonia addition to 2 in a continuous-flow microreactor filled with SwCNTCOOH-PALII (2 m NH3, pH 10.0, 15 bar) between 30-80 °C indicated no significant loss of activity over 72 h up to 60 °C. SwCNTCOOH-PALII in the continuous-flow system at 30 °C was more productive (specific reaction rate, rflow=2.39 µmol min-1 g-1) than in the batch reaction (rbatch=1.34 µmol min-1 g-1).

Additives enhancing the catalytic properties of lipase from Burkholderia cepacia immobilized on mixed-function-grafted mesoporous silica gel.

Effects of various additives on the lipase from Burkholderia cepacia (BcL) immobilized on mixed-function-grafted mesoporous silica gel support by hydrophobic adsorption and covalent attachment were investigated. Catalytic properties of the immobilized biocatalysts were characterized in kinetic resolution of racemic 1-phenylethanol (rac-1a) and 1-(thiophen-2-yl)ethan-1-ol (rac-1b). Screening of more than 40 additives showed significantly enhanced productivity of immobilized BcL with several additives such as PEGs, oleic acid and polyvinyl alcohol. Effects of substrate concentration and temperature between 0-100 °C on kinetic resolution of rac-1a were studied with the best adsorbed BcLs containing PEG 20 k or PVA 18-88 additives in continuous-flow packed-bed reactor. The optimum temperature of lipase activity for BcL co-immobilized with PEG 20k found at around 30 °C determined in the continuous-flow system increased remarkably to around 80 °C for BcL co-immobilized with PVA 18-88.