Custo energético no exercício de Back Row realizado no TRX®
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2016-05-18
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O objetivo do presente estudo foi verificar qual o Custo Energético (CE) estimado combinando os contributos das frações aeróbia e anaeróbia bem como quantificar a precisão da estimativa do mesmo através da reta de regressão VO2/carga no exercício de Back Row (BR) no aparelho TRX force kit: Tactical®. Para o efeito 14 sujeitos do sexo masculino (idade=23,14±2,54 anos; estatura=170,43±4,67 cm; massa corporal=69,43±6,31 kg e gordura corporal estimada=7,11±2,55%) foram sujeitos a 5 sessões de estudo, com 72 horas de intervalo entre elas. Em cada sessão foi medido o VO2 em dois momentos: em repouso, num período de 15 minutos e durante o exercício BR efetuado com um dos seguintes graus de inclinação, nomeadamente 110º, 120º, 125º, 130º e 160º, tendo como referência o maléolo externo do perónio, a barra fixa em contacto com o chão e a barra móvel em contacto com o maléolo externo do fémur, do Goniómetro Rulong®. Em todas as sessões foi medido VO2 durante 15 minutos de repouso e durante a execução do exercício utilizando um espirómetro portátil (“K4b2 COSMED® K4b2, Roma, Itália”). Foi igualmente medida a variação da concentração sanguínea de lactato, (antes e após exercício), utilizando um analisador portátil Accutrend® Plus. Foi efetuada uma regressão linear para obtenção das estimativas do declive, valor de dispersão e o valor no eixo das abcissas. O CE foi calculado através da soma das equações obtidas pela regressão linear e do equivalente energético do lactato no sangue. O erro padrão da regressão foi utilizado como indicador da robustez da relação entre as variáveis utilizadas para a realização das equações de predição do custo energético. Foi obtida a equação standard, de predição do custo energético, y = 0,21x-11,770 com um erro padrão de 0,6 ml.kg-1.min-1 e um R=0, 96 e a equação alternativa y = 0,078x+4,252 com um erro padrão de 1,24 ml.kg-1.min-1 e um R=0,97, em que Y é o VO2 e X o ângulo de inclinação.
The aim of the current study was to verify the estimated cost by combining the contributions of aerobic and anaerobic fractions and quantify the accuracy of estimating the regression line through the VO2 / charge in the exercise of Back Row (BR) in TRX force kit: Tactical® device. For that, it was recruited a sample constituted by 14 male subjects (age=23,14±2,54; height=170,43±4,67 cm; body mass=69,43±6,31 kg and estimated body fat=7,11±2,55%), who were submitted to 5 experiment sessions, with 72 hours of break between them. In each session, it was measured the oxygen uptake in two different moments: during 15 minutes of rest, and during BR’s exercise performed with 110º, 120º, 125º, 130º and 160º tilt degree, using the external malleolus of fibula as a reference to the bar fixed to the floor and the malleolus of femur to the unfixed bar, of Rulong® Goniometer. In every session it was measured the VO2, with a portable spirometer (“K4b2 COSMED® K4b2, Rome, Italy”), during 15 minutes of rest, and during the exercise. Likewise, it was measured the variation of blood lactate concentration, (before and after exercise), using a portable analyzer Accutrend® Plus. In order to estimate the slope, the dispersion value and the value on the axis of abscissas, a linear regression was performed. The CE was calculated by the addition of obtained equations from linear regression and the energetic match of blood lactate concentration. The standard error of regression was used as indicator to robustness of the relationship between the variables used, to found the CE predicting equation. Finally, it was obtained the standard CE predicting equation, y = 0,21x-11,770 with a standard error of 0,6 ml.kg-1.min-1 and a R=0, 96 and an alternative equation, y = 0,078x+4,252 with a standard error of 1,24 ml.kg-1.min-1 and a R=0,97, with Y representing the VO2 and with X representing the inclination angle.
The aim of the current study was to verify the estimated cost by combining the contributions of aerobic and anaerobic fractions and quantify the accuracy of estimating the regression line through the VO2 / charge in the exercise of Back Row (BR) in TRX force kit: Tactical® device. For that, it was recruited a sample constituted by 14 male subjects (age=23,14±2,54; height=170,43±4,67 cm; body mass=69,43±6,31 kg and estimated body fat=7,11±2,55%), who were submitted to 5 experiment sessions, with 72 hours of break between them. In each session, it was measured the oxygen uptake in two different moments: during 15 minutes of rest, and during BR’s exercise performed with 110º, 120º, 125º, 130º and 160º tilt degree, using the external malleolus of fibula as a reference to the bar fixed to the floor and the malleolus of femur to the unfixed bar, of Rulong® Goniometer. In every session it was measured the VO2, with a portable spirometer (“K4b2 COSMED® K4b2, Rome, Italy”), during 15 minutes of rest, and during the exercise. Likewise, it was measured the variation of blood lactate concentration, (before and after exercise), using a portable analyzer Accutrend® Plus. In order to estimate the slope, the dispersion value and the value on the axis of abscissas, a linear regression was performed. The CE was calculated by the addition of obtained equations from linear regression and the energetic match of blood lactate concentration. The standard error of regression was used as indicator to robustness of the relationship between the variables used, to found the CE predicting equation. Finally, it was obtained the standard CE predicting equation, y = 0,21x-11,770 with a standard error of 0,6 ml.kg-1.min-1 and a R=0, 96 and an alternative equation, y = 0,078x+4,252 with a standard error of 1,24 ml.kg-1.min-1 and a R=0,97, with Y representing the VO2 and with X representing the inclination angle.
Descrição
Dissertação de Mestrado em Ciências do Desporto, Especialização em Atividades de Academia
Palavras-chave
Treino de força , Consumo de oxigénio , Lactato , Custo energético , Défice de oxigénio acumulado