Rev Bras Cineantropom Desempenho Hum 2010, 12(1):62-67Resumo -O índice de tensão específica (ITE) estima a relação entre o torque máximo (TQ) e o volume muscular (VM) para uma tarefa específica, e inclui a espessura muscular (EM) como um parâmetro medido diretamente pela ultrassonografia. O objetivo do presente estudo foi comparar o VM, TQ e ITE dos flexores do cotovelo entre indivíduos treinados e não treinados em força. Participaram do estudo 40 homens, sendo 11 treinados em força há pelo menos dois anos [grupo treinado (GT): 23,5 ± 3,1 anos; 182,1 ± 4,9 cm; 88,1 ± 8, ). O ITE dos flexores de cotovelo não apresentou valores reduzidos para o GT, sugerindo a manutenção da linearidade da relação força-volume. O TQ e a estimativa de VM mostraram-se confiáveis na distinção dos grupos, e a medida de ITE pode contribuir para análise mais aplicada, no campo da prática clínica e da prescrição de atividades físicas, como um indicador de níveis não adequados de sobrecarga e de risco de lesão. Palavras-chave: Força muscular; Biomecânica; Torque máximo. [trained group (TG): 23.5 ± 3.1 years; 182.1 ± 4.9 cm; 88.1 ± 8.4 kg] and 29 untrained subjects [untrained group (UG): 29.8 ± 1.6 years; 172.4 ± 6.6 cm; 76.4 ± 8.1 kg], participated in the study. The STI of the elbow flexors, expressed as the TQ/MV ratio, was calculated for both groups. Muscle thickness measured by ultrasound was used to estimate MV. TQ of the elbow flexors was estimated using maximum isometric voluntary contractions. The Mann-Whitney test was used to determine possible differences in TQ, STI and MV between groups. MV and TQ were significantly higher in TG (526.07 ± 86.13 cm 3 ; 112.04 ± 24.18 Nm) than UG (385.40 ± 80.89 cm 3 ; 88.46 ± 13.77 Nm). There was no significant difference in the and Abstract -The specific tension index (STI) estimates the ratio of maximum torque (TQ) to muscle volume (MV) for a specific task and includes muscle thickness as a parameter, which can be directly evaluated by ultrasound. The objective of the present study was to compare TQ, MV and STI of the elbow flexors between strength-trained and untrained subjects. Forty men, including 11 subjects strength trained for at least two years
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