Reprodutibilidade da curva força-tempo do estilo "Crawl" em protocolo de curta duração

Abstract

O objetivo deste estudo foi analisar a reprodutibilidade dos parâmetros biomecânicos da curva força-tempo do estilo "Crawl" em um protocolo de 10 s no nado atado. Dezesseis nadadores do sexo masculino (idade: 20,4 ± 4,0 anos; tempo na prova de 100 m livre: 53,68 ± 0,99 s) realizaram dois esforços máximos de 10 s no nado atado. Os parâmetros força pico, força média, taxa de desenvolvimento de força, impulso, duração da braçada, tempo para atingir a força pico e força mínima foram representados pela média de oito braçadas consecutivas obtidas em cada tentativa. Utilizou-se o teste t para observar as diferenças entre os esforços para cada parâmetro. O nível de significância estabelecido foi de 5%. A reprodutibilidade relativa foi medida pelo coeficiente de correlação de Pearson e a consistência entre as duas tentativas pelo coeficiente de correlação intraclasse (CCI). A reprodutibilidade absoluta foi verificada pelo coeficiente de variação (CV). Não foi demonstrada diferença estatisticamente significante para nenhum parâmetro biomecânico quando comparados os dois esforços. Os elevados CCI e baixos CV indicaram alta consistência interna dos parâmetros analisados. Conclui-se que os parâmetros biomecânicos analisados a partir do nado atado são reprodutíveis quando empregado protocolo de curta duração o que demonstra a possibilidade de utilização do protocolo com alto grau de confiabilidade, por parte de treinadores e atletas.

Repetibilidade e aplicação de testes de nado estacionário para nadadores recreacionais

“…Furthermore, the accuracy of measures assessed by standard error 18 was also better for mean forces than for maximum forces ( Table 1). These findings partially corroborate the previously established hypothesis, since the maximum force, in addition to the other kinetic variables reached by competitive swimmers in the crawl stroke presents repeatability 11 . On the other hand, it is important to note that, to the best of the authors' knowledge, the present study was the first to investigate the repeatability of tethered swimming tests for leg kicking and arm stroke in crawl swimming.…”

“…The tethered swimming test has been used by coaches and researchers to evaluate swimmers 3,5,6 , since, considering crawl stroke, the test presents some similarities with non-tethered (free) swim for stroke rate and for some physiological responses such as blood lactate concentration, heart rate and subjective perception of effort 6,8,9 . In addition, several studies have identified an association between the outcome of the tethered swimming test and sports performance 3,10 and have verified the test repeatability for competitive swimmers 7,8,11 .…”

“…Thus, considering the large number of recreational swimmers and that the tethered swimming test may be useful for coaches to evaluate the technique and force production by swimmers, the aims of this study were to verify the repeatability of the tethered swimming test for the upper limbs (arm stroke), lower limbs (leg kicking) and full crawl stroke, and to verify the association between performance over the 50-m test and tethered swimming tests with recreational swimmers. According to previous studies with competitive swimmers 3,7,8,10,11 , it has been hypothesized that there is repeatability for the tests and that there is also an association between the results of the tethered swimming test performed with crawl stroke and crawl stroke performance of recreational swimmers.…”

Interpretation of Propulsive Force in Tethered Swimming Through Principal Component Analysis

“…Thus, the aim of this study was to identify, through the biomechanical parameters extracted from the force-time curve of tethered swimming, the latent dimensions that would contribute most to the generation of impulse in fully tethered swimming. 21 who considered the minimum indices adopted by the entities responsible for participation in the Senior category 100m freestyle race at international, national and state level during the year in which the research was carried out; in this case, indices established in the year 2016. Swimmers achieved times of 53.12 ± 2.36s and were ranked at national level.…”

Relação entre a força propulsora e a velocidade nos quatro estilos competitivos da natação

“…A literatura apresenta, basicamente, dois métodos válidos de mensuração da força aplicada durante o nado: o método de nado atado ("tethered swimming") (BARBOSA, 2010; BARBOSA; ANDRADE; MOREIRA; SERRÃO; ANDRIES JÚNIOR, 2012;DOPSAJ et al, 2002;FOMITCHENKO, 1999;KESKINEN;KOMI, 1993;MARINHO;GOMES, 1999; PAPOTI; ZAGATTO; FREITAS JÚNIOR; CUNHA;…”