Browsing by Author "Sousa, J."
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- Design and validation of an instrument for technical performance indicators of the kick (chagi) technique in taekwondoPublication . Sousa, J.; Gamonales, J.; Louro, Hugo; Sobreiro, Pedro; Ibáñez, S.Taekwondo is a martial art and combat sport that originated in medieval or similar cultures, but today it is primarily a combat activity conditioned by safety rules. The kick technique is called “chagi” (Korean language). “Eyeballing” is a problem that is being addressed with traditional training methods used in Taekwondo. (1) Background: To solve this problem, the main aim of this study was to develop an Observation System for Technical Performance Indicators-Chagi (OSTPI-C). The validation and reliability processes were carried out by 19 expert judges, who were required to meet at least four out of the five selected inclusion criteria. (2) Methods: The content validity was calculated using Aiken’s V coefficient value on qualitative (relevance, univocity, and importance) and quantitative levels (rating scale from one to five), through the agreement and consensus of the panel experts. The reliability of the instrument was analyzed using Cronbach’s alpha coefficient. (3) Results: The results demonstrated the high content validity indexes (0.90) and high reliability (alpha > 0.70) of the observational instrument. (4) Conclusions: The OSTIP-C observational instrument could be used in the Olympic and Paralympic Taekwondo sport environment as a valid and reliable tool to evaluate the technical execution of kick technical processes.
- In vitro clonal behavior of Olea europaea L., variety Galega vulgarPublication . Jacob, Ana; Cordeiro, T.; Vaz, A.; Nascimento, M. J.; Bernardino, S.; Frazão, R.; Aranha, T.; Ferreira, B.; Sousa, J.A multiplicação clonal da cultivar de oliveira Galega vulgar por estacaria semi-lenhosa, é impedida pelas baixas taxas de enraizamento, as quais, segundo alguns autores, não ultrapassam os 10%, originando assim desequilíbrios entre a procura e a oferta bem como preços de mercado mais elevados face a outras cultivares de fácil enraizamento. A micropropagação por rebentação axilar surge como uma técnica alternativa de clonagem, por originar rejuvenescimento das plantas e taxas de enraizamento in vitro próximas ou iguais a 100%. Utilizando estacas de árvores adultas do pomar clonal de Galega vulgar existente na ESAS, anterior e parcialmente caracterizado por outras Instituições para a) presença de vírus; b) taxas de enraizamento; c) rendimento em azeite, introduziram-se aleatoriamente 39 clones in vitro, existindo actualmente 15 clones in vitro. Sendo raras as publicações sobre estudos de diferenças clonais no comportamento in vitro na oliveira e noutras espécies, este trabalho apresenta os resultados obtidos nos estudos efectuados desde 2003 para 15 clones, respeitantes à 1) introdução de material vegetal; 2) controlo de bacterioses sistémicas; 3) caracterização da variação interclonal nas taxas de multiplicação, enraizamento e aclimatação.Clonal multiplication of olive variety Galega vulgar trough leafy steam cuttings is impeded by low rooting rates, according to some authors do not overcome 10% of success. Those situations originates imbalances between plant offer and market demand as well as higher prices of plants face others varieties. Micropropagation trough adventitious multiplication is a technical proceeding able for cloning recalcitrant woody plants. Trough rejuvenation of plants, rates of 100% in rooting is achieved. Using cuttings from adult trees of a clonal orchard of Galega vulgar in ESAS, previously and partially characterized for a) presence of virus; b) rooting rates of cuttings; c) olive oil yield, 39 clones where randomly introduced in vitro for an actual collection of 15 in vitro clones. Published papers concerning in vitro clonal behavior for olive or other species are rare, thus, this work presents the obtained results since 2003 for 1) introduction of clones; 2) systemic bacterioses control; 3) clonal variation in multiplication, rooting and acclimatization