Dispêndio energético em três ergómetros da marca Concept2®
Data
2019-09-06
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Os ergómetros são aparelhos amplamente utilizados nas Academias, ginásios e Health-Centers na realização de exercícios predominantemente aeróbios. Dentro desses ergómetros os simuladores de remo (RE), de esquiar (SKI) e de pedalar (BIKE) da marca Concept2® são muito usuais dentro desses espaços. Os mostradores desses equipamentos demonstram, além de outros parâmetros, o trabalho realizado durante a sua execução. Contudo, esses equipamentos possuem diferentes técnicas de realização e grupos musculares solicitados. Desta forma, o objetivo do presente estudo é observar qual o dispêndio energético e o substrato predominantemente utilizado na realização de um esforço, nos três equipamentos da marca, com a mesma carga externa (150W). Para o efeito 20 sujeitos do sexo masculino, aparentemente saudáveis, com idades compreendidas entre os 22 e os 36 anos, fisicamente ativos e com experiência nos ergómetros de RE, BIKE e SKI pelo menos há 6 meses realizaram de forma individual 3 sessões experimentais, separadas entre si por 7 dias, no mesmo horário, com a duração de 20 minutos, a uma intensidade de 150watts. Em cada sessão e por sorteio foi utilizado 1 dos três ergómetros. Durante cada sessão foi utilizado um espirómetro portátil (K5 cosmed, Italy) para recolha dos valores de consumo de oxigénio (VO2) e produção de CO2, de forma a calcular o custo energético da sessão e o substrato energético predominante. Foi observado que o SKI apresenta valores de VO2 absoluto (l/min) e relativo (ml/kg/min) significativamente (p=0,002) superior do que na BIKE (158,45±18,87 bat/min versus 135±21,35 bat/min), tal como a utilização como fonte metabólica os Hidratos de Carbono (p=0,002, 3,94±1,05g versus 2,94±0,95g). O dispêndio energético (kcal/min) é significativamente (p<0,003) superior no SKI em relação aos restantes ergómetros (15,17±1,45, 13,74±1,27 e 12,32±1,13, SKI, RE e BIKE, respetivamente) e no RE em relação à BIKE (p=0,003, 13,74±1,27 versus 12,32±1,13). Com base nos presentes resultados, podemos afirmar que na realização de um exercício predominantemente aeróbio, nos 3 ergómetros da Concept2®, à intensidade de 150W, o custo energético é superior no SKI em relação aos restantes ergómetros. Os Hidratos de carbono são o substrato predominantemente utilizado em todos os ergómetros e no SKI é significativamente superior à BIKE.
Ergometers are devices widely used in academies, health clubs and gyms to perform predominantly aerobic exercises. Within these ergometers we have the rowing simulators (RE), cross-country ski (SKI) and bike (BIKE) of the brand Concept2®, which are very common in theses spaces. The ergometers’ monitor show the work during the execution, besides other parameters. However, the technique used on these ergometers and the working muscles used are different. So, the purpose of this study is to observe what is the energy expenditure and what predominant substrate is used in an effort on the three Concept2® ergometers at the same external load (150W). For this purpose, 20 apparently healthy male subjects, aged between 22 and 36 years old, physically active and with training experience on the ergometers RE, BIKE and SKI for at least 6 months. Each subject performed 3 experimental session, each one separated by at least 7 days, in the same time of the day, with a 20 minutes duration, at an intensity of 150 watts. Participants were randomly assigned to one of the three ergometers in each session. During each session was used a portable spirometer (K5 cosmed, Italy) to collect the values of oxygen consumption (VO2) and output of CO2, in order to calculate the energy expenditure and the predominant energy substrate of the session. It was observed that the value of absolute (l/min) and relative (ml/kg/min) VO2 in SKI were significantly higher (p<0,0001) than the values of RE and BIKE (3,03±0,29, 2,75±0,25 e 2,46±0,23; 38,74±4,40, 35,08±4,55 e 31,55±4,20, VO2 absolute and relative, SKI, RE and BIKE respectively). Also, in the same variables, RE values are significantly higher (p=0,002) than in BIKE (158,45±18,87 versus 135±21,35), such as the use of carbohydrates as a primarily metabolic source (p=0,002, 3,94±1,05 versus 2,94±0,95). Energy expenditure (kcal/min) was significantly higher (p<0,003) in SKI in relation to the other ergometers (15,17±1,45, 13,74±1,27 e 12,32±1,13, SKI, RE and BIKE, respectively) and in RE when compared to BIKE (p=0,003, 13,74±1,27 versus 12,32±1,13). Based on the results, we can say that performing a predominantly aerobic exercise, on the 3 ergometers from Concept2®, at 150W of intensity, the energy expenditure was higher in SKI compared to the other analyzed ergometers. Carbohydrates are the predominant substrate in all ergometers and in the SKI is significantly higher than in the BIKE.
Ergometers are devices widely used in academies, health clubs and gyms to perform predominantly aerobic exercises. Within these ergometers we have the rowing simulators (RE), cross-country ski (SKI) and bike (BIKE) of the brand Concept2®, which are very common in theses spaces. The ergometers’ monitor show the work during the execution, besides other parameters. However, the technique used on these ergometers and the working muscles used are different. So, the purpose of this study is to observe what is the energy expenditure and what predominant substrate is used in an effort on the three Concept2® ergometers at the same external load (150W). For this purpose, 20 apparently healthy male subjects, aged between 22 and 36 years old, physically active and with training experience on the ergometers RE, BIKE and SKI for at least 6 months. Each subject performed 3 experimental session, each one separated by at least 7 days, in the same time of the day, with a 20 minutes duration, at an intensity of 150 watts. Participants were randomly assigned to one of the three ergometers in each session. During each session was used a portable spirometer (K5 cosmed, Italy) to collect the values of oxygen consumption (VO2) and output of CO2, in order to calculate the energy expenditure and the predominant energy substrate of the session. It was observed that the value of absolute (l/min) and relative (ml/kg/min) VO2 in SKI were significantly higher (p<0,0001) than the values of RE and BIKE (3,03±0,29, 2,75±0,25 e 2,46±0,23; 38,74±4,40, 35,08±4,55 e 31,55±4,20, VO2 absolute and relative, SKI, RE and BIKE respectively). Also, in the same variables, RE values are significantly higher (p=0,002) than in BIKE (158,45±18,87 versus 135±21,35), such as the use of carbohydrates as a primarily metabolic source (p=0,002, 3,94±1,05 versus 2,94±0,95). Energy expenditure (kcal/min) was significantly higher (p<0,003) in SKI in relation to the other ergometers (15,17±1,45, 13,74±1,27 e 12,32±1,13, SKI, RE and BIKE, respectively) and in RE when compared to BIKE (p=0,003, 13,74±1,27 versus 12,32±1,13). Based on the results, we can say that performing a predominantly aerobic exercise, on the 3 ergometers from Concept2®, at 150W of intensity, the energy expenditure was higher in SKI compared to the other analyzed ergometers. Carbohydrates are the predominant substrate in all ergometers and in the SKI is significantly higher than in the BIKE.
Descrição
Dissertação de Mestrado em Ciências do Desporto com especialização em Atividades de Academia
Palavras-chave
Dispêndio Energético , Concept2®