The aim of this study was to determine the relative and absolute reliability of second lactate turnpoint using fixed and individual blood lactate method in competitive cyclists. Twenty-eight male, well-trained cyclists (30.2 ± 10.1 years, 72.0 ± 7.4 kg, 177.3 ± 4.7 cm) were recruited to participate in this study. Cyclists completed two incremental cycling tests to exhaustion over a period of 7 days to determine their peak power output, maximal oxygen uptake, maximal heart rate, maximal blood lactate concentration and two lactate turnpoint criteria. The fixed blood concentration criterion (3.5 mM) and an individual criterion were assessed by a lactate-power curve, considering power output, heart rate and oxygen uptake. The main finding of this study was that both lactate turnpoint criteria showed identical low within-subject variation for power output (2.8% coefficient of variation). High values for test-retest correlations ranging from r = 0.70 to r = 0.94 were found for all variables in both threshold criteria. In conclusion, the individual and fixed method to determine the second lactate turnpoint showed similar high absolute and relative reliability in competitive cyclists.
Comparison of body composition and aerobic and anaerobic performance between competitive cyclists and triathletes Comparação da composição corporal, desempenho aeróbio e anaeróbio entre ciclistas e triatletas competitivosAbstract -The aim of this study was to compare anthropometric characteristics and aerobic and anaerobic fitness between competitive cyclists and triathletes. The sample consisted of 11 cyclists and 12 triathletes with experience in competitions. The tests were performed on two different days, with an interval of 48 h between sessions. On the first day, the athletes were submitted to anthropometric assessment (body mass, height, and skinfold thickness) and a maximal incremental test to determine maximal oxygen uptake, maximum power, maximum heart rate, maximum lactate, and the first (LL 1 ) and second lactate threshold (LL 2 ). The Wingate test was conducted on the second day to determine peak power, average power, and fatigue index. There were significant difference (p < 0.05), with medium effect size (0.80 -1.5), in mid-thigh skinfold thickness (15.2 ± 6.3 and 10.5 ± 4.8 mm), power at LL 1 (195.0 ± 30.9 and 162.7 ± 28.3 W), power at LL 2 (247.6 ± 25.0 and 219.7 ± 37.9 W), and fatigue index (47.2 ± 13.0 and 60.1 ± 16.4%) between cyclists and triathletes, respectively. The other variables did not differ between groups. Anthropometric characteristics are similar in triathletes and cyclists. However, cyclists present higher power outputs at the lactate thresholds (LL 1 and LL 2 ) and lower fatigue indexes. Key words: Aerobic performance; Anaerobic performance; Anthropometry; Cycling; Triathlon. (0,80 -1,5) para a dobra cutânea da coxa média (15,2 ± 6,3 e 10,5 ± 4,8 mm), potência no LL 1 (195,0 ± 30,9 e 162,7 ± 28,3 W), potência no LL 2 (247,6 ± 25 e 219,7 ± 37,9 W) e índice de fadiga (47,2 ± 13,0 e 60,1 ± 16,4 %) Resumo -O objetivo do presente estudo foi comparar as características antropométricas e aptidão aeróbia e anaeróbia entre ciclistas e triatletas competitivos. Participaram do estudo 11 ciclistas e 12 triatletas com experiência em competições esportivas. As avaliações foram realizadas em dois dias distintos, com intervalo de
Reproducibility of frequency content from surface electromyography (sEMG) signals has not been assessed and it is unknown if incremental load testing design could affect sEMG in cycling. The goals of this study were to assess the reproducibility of measures from sEMG frequency content between sessions and to compare these frequency components between a ramp and a step incremental cycling test. Eighteen cyclists performed four incremental load cycling tests to exhaustion. Two tests were performed using a step increment (load started at 100 W for 3 min followed by increments of 30 W every 3 min) and two were performed using a ramp increment (load started at 100 W for 1 min followed by increments of 30 W·min). sEMG was monitored bilaterally for the rectus femoris and vastus lateralis throughout the tests and converted into overall activation (whole signal bandwidth), high- and low-frequency contents. The reproducibility of the frequency content ranged from none to strong (ICC = 0.07-0.90). Vastus lateralis activation was larger at the step compared to the ramp test (P < 0.01), without differences for rectus femoris (P = 0.22-0.91) and for the high-frequency (P = 0.28-0.95) and low-frequency contents (P = 0.13-0.94). sEMG from vastus lateralis and rectus femoris presented none to strong reproducibility. Vastus lateralis is more activated in step test design.
O objetivo deste artigo foi analisar as dissertações da área de “Cineantropometria e Desempenho Humano” do Programa de Pós-Graduação em Educação Física da UFSC. Foi realizada uma pesquisa do tipo estudo de caso, por meio da análise documental de 33 dissertações defendidas entre 2007 e 2011. As temáticas verificadas perpassaram pela validação de testes, indicadores antropométricos, análise do movimento humano, índices fisiológicos e neuromusculares associados ao rendimento esportivo, até mecanismos de lesão decorrentes desta prática. Os métodos de medição mais comumente utilizados foram antropometria, dinamometria, cinemetria, ergoespirometria e lactimetria. Observou-se que 60,6% das dissertações resultaram em 36 artigos científicos, publicados, principalmente, em periódicos classificados nos estratos intermediários do Qualis da Área 21 CAPES. A maior taxa média de publicação (TMP) foi verificada em 2010 (TMP=1,75), havendo grande oscilação no período analisado. Conclui-se que as dissertações defendidas têm atendido, em parte, as demandas das linhas de pesquisa da área, resultando também em boa produção intelectual.
RESUMOOs objetivos deste estudo foram comparar diferentes métodos utilizados para predizer a máxima fase estável de lactato (MLSS), verificar a correlação entre velocidade crítica (VC) e limiar anaeróbio (LAn) e identificar a ocorrência de estabilidade no lactato sanguíneo durante a natação. A amostra constituiu-se de nove nadadores do sexo masculino. Para determinação direta do LAn 4mM utilizou-se de três repetições de 400m nado crawl a 80%, 85% e 90% da velocidade máxima. Os métodos indiretos utilizados foram a VC, que foi determinada a partir da reta de regressão linear entre distâncias e os respectivos tempos (200m, 400m e 700m), e o LAn equação obtido por meio da performance nos 700m. Não foram encontradas diferenças entre o LAn 4mM , LAn equação e a VC. Pode-se concluir que os protocolos indiretos são válidos para a predição da velocidade correspondente ao LAn, portanto, mais práticos e de menor custo financeiro para serem utilizados na avaliação da capacidade aeróbia de nadadores moderadamente treinados.
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