The objective of the present study was to analyze the effect of 10% body mass reduction on simulated taekwondo match performance. Thirty-one male taekwondo athletes were randomly distributed in two groups: weight loss group (n= 15) – athletes in this group reduced 5% body mass per week during two successive weeks, totaling 10% body mass reduction; control group (n= 16) – athletes in this group kept their body mass constant during the 2-week period. Twenty-four hours before and after this period, athletes performed a simulated 3-round taekwondo match (6 min). Athletes wore body protectors to validate the scores during the match according to the official taekwondo rules. Match was filmed and actions were categorized using the Game Performance Assessment Instrument. There was a group and time interaction (P< 0.001) for body mass, with decrease only for the weight loss group (P= 0.001). A group and time interaction was also observed for the taekwondo match performance (P< 0.001), with performance increase being found only for the control group (P= 0.01). Thus, the 10% weight loss was not a good strategy to improve taekwondo skills’ performance.
Purpose. to verify the validity of Instant Heart Rate ® application in smartphones for the measurement of exercise heart rate. Methods. the individuals were initially instructed about all the procedures to be performed and signed the consent form. Anthropometric measures and rest heart rate were evaluated before the experimental session of the study. the subjects partici pated in a selfselected exercise on a cycle ergometer for 10 minutes. Results. the results for validity demonstrated in an iPhone/iOs ® smartphone revealed the intraclass correlation coefficient of r = 0.87 with a tendency to overestimate the heart rate by 5 bpm. For the Lenovo/Android ® model, the intraclass correlation coefficient was r = 0.98, underestimating the values by-0.7 bpm. thus, both systems presented high correlation values, and the error observed did not seem to compromise the several measures that use heart rate as a parameter. Conclusions. It is possible to conclude that heart rate monitoring by the Instant Heart Rate ® application on iPhone/iOs ® and Lenovo/Android ® operating system smartphones can be performed safely during exercise, with the Lenovo/Android ® base being even more reliable than the iPhone/iOs ® system.
Resumo: O objetivo do presente estudo foi avaliar a percepção da qualidade de vida (QV) dos atletas paralímpicos das modalidades de atletismo e natação. Tratou-se de um estudo descritivo e de corte transversal com 32 paratletas, sendo 22 de atletismo e 10 de natação. Para avaliação da QV foi utilizado o questionário de avaliação abreviado da qualidade de vida da Organização Mundial da Saúde. Para análise dos dados foi utilizado o teste de Shapiro-Wilk; como os dados apresentaram distribuição não paramétrica, foi adotada a apresentação descritiva em mediana (Md) e intervalo interquartílico (Q1; Q3). Para comparar a QV em função do gênero e do patrocínio, foi utilizado o teste de "U" de Mann-Whitney, e para comparar a QV entre o nível de escolaridade, foi utilizado o teste de Kruskal-Wallis. Observou-se entre os domínios de QV que o domínio meio ambiente obteve o menor índice e o domínio social obteve o maior índice entre os paratletas pesquisados. Em relação aos subgrupos mais prejudicados os menores valores encontrados foram entre os paratletas com níveis de escolaridades fundamental I e nível superior, que apresentaram diferenças nos domínios ambientais e de QV geral, fundamental I com ensino médio, apenas na QV geral e fundamental II com ensino superior, apenas no domínio ambiental. Não foram constatadas diferenças significativas na percepção da QV entre os paratletas com e sem patrocínio, e entre as modalidades atletismo e natação. Conclui-se que os atletas paralímpicos que possuem menor nível de escolaridade apresentaram-se como os grupos com menores percepções de QV.
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