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José Arias

Does the Modification of Ball Mass Influence the Types of Attempted and Successful Shots in Youth Basketball?

Purpose. This study aimed at determining: (a) whether the effect of modifying ball mass allowed youth basketball players to attempt a greater number of lay-ups and hook shots during real games, and (b) whether the modification affected successful shots. Methods. Fifty-four boys from six basketball teams, aged between 10-11 years, participated in the study. The independent variable was ball mass and the dependent variable was the attempted and successful type of shots (set and jump shot, lay-ups, and hook shot). We established three situations in which four games were played with each of the following balls: (a) a regulation ball, (b) a ball of smaller mass (440 g), and (c) a ball of greater mass (540 g). Four observers were trained (intra- and inter-observer reliability > 0.96). Four observers recorded the data utilizing a systematized register from observation of the game videos. Results. A higher percentage of lay-ups were attempted with the 440-g ball in comparison with the regulation ball (U = 227906, p = 0.01, ES = 0.152) and with the 540-g ball (U = 218614, p = 0.01, ES = 0.160). A higher percentage of lay-ups were successful with the 440-g ball in comparison to the 540-g ball (U = 223080, p = 0.02, ES = 0.210). Conclusions. Only attempted lay-ups increased with the 440-g ball in comparison to the regulation ball, but the percentage of the rest of kinds of attempted shots and successful shots were similar when comparing the modified balls to the regulation ball.

Open access

Edwin Henao-García, Jose Arias-Pérez and Nelson Lozada-Barahona

Abstract

Research on innovation and entrepreneurship has increased in recent years. This article explores the structure of innovation research based on Global Entrepreneurship Monitor (GEM) project. A search of articles containing innovation and GEM related words was conducted, including only those published in journals within the Thomson Reuters’ Social Sciences Citation Index®. The main findings of this study show that is feasible use GEM’s data set to do research on innovation. Models that treat new firm creation and innovation as separate aspects of entrepreneurship, as well as, determinants of economic growth could be conceptualize and test with data provide by GEM project. Also, the number of innovations articles using GEM’ database has increased in recent years, suggesting opportunities and challenges for future research.

Open access

Edwin Henao-García, Jose Arias-Pérez and Nelson Lozada-Barahona

Abstract

Corporate entrepreneurship refers to entrepreneurship activities that take place within established firms. Such activities have attracted the interest of researchers in the area of management and business for several years now. The aim of this work is to examine the influence of individuals’ resources and capabilities on corporate entrepreneurship in Colombia, using data from Global Entrepreneurship Monitor 2013 and including 3,394 observations. The study draws on the Resource-Based Theory and uses logistic regressions in its methodology, considering differences between resources (entrepreneurial skills and competencies, entrepreneurial experience, personal networks and education) and capabilities (entrepreneurial intention and opportunity identification). This work offers theoretical and empirical contributions. Theoretically, it contributes to the development of the literature in the field of corporate entrepreneurship in Latin American emerging markets. Empirically, it serves as a guide for those managers wishing to foster corporate entrepreneurship in their firms.

Open access

José M. González-Ravé, Daniel Juárez, Jacobo A. Rubio-Arias, Vicente J Clemente-Suarez, María A Martinez-Valencia and Javier Abian-Vicen

Abstract

Isokinetic strength evaluation of the knee flexion and extension in concentric mode of contraction is an important part of the comprehensive evaluation of athletes. The aims of this study were to evaluate the isokinetic knee peak torque in both the extension and flexion movement in the dominant and non-dominant leg, and the relationship with jumping performance. Twelve elite male handball players from the top Spanish handball division voluntary participated in the study (age 27.68 ± 4.12 years; body mass 92.89 ± 12.34 kg; body height 1.90 ± 0.05 m). The knee extensor and flexor muscle peak torque of each leg were concentrically measured at 60°/s and 180°/s with an isokinetic dynamometer. The Squat Jump and Countermovement Jump were performed on a force platform to determine power and vertical jump height. Non-significant differences were observed between legs in the isokinetic knee extension (dominant= 2.91 ± 0.53 Nm/kg vs non-dominant = 2.70 ± 0.47 Nm/kg at 60°/s; dominant = 1.90 ± 0.31 Nm/kg vs non-dominant = 1.83 ± 0.29 Nm/kg at 180°/s) and flexion peak torques (dominant = 1.76 ± 0.29 Nm/kg vs non-dominant = 1.72 ± 0.39 Nm/kg at 60°/s; dominant = 1.30 ± 0.23 Nm/kg vs non-dominant = 1.27 ± 0.35 Nm/kg at 180°/s). Low and non-significant correlation coefficients were found between the isokinetic peak torques and vertical jumping performance (SJ = 31.21 ± 4.32 cm; CMJ = 35.89 ± 4.20 cm). Similar isokinetic strength was observed between the legs; therefore, no relationship was found between the isokinetic knee flexion and extension peak torques as well as vertical jumping performance in elite handball players.