ABSTRACT
The present study aimed to investigate the effectiveness of high-intensity interval training (HIIT) in the body composition of Wistar rats. The HIIT protocol consisted of high-intensity swimming three times a week for four weeks. There were no differences between groups as to the Lee index. However, the weights of the perigonadal (p=0.001) and retroperitoneal (p=0.026) fats were significantly different between the Control Group (CG, n=10) vs. Trained Group (TG, n=10), respectively. There was also a significant increase in the body weight of the animals in TG (16.43%) and CG (7.19%) at the end of the experiment. These findings suggested that HIIT was not sufficient to improve significantly the body composition of rats.
Subject(s)
Physical Conditioning, Animal , Swimming , Body Composition , High-Intensity Interval TrainingABSTRACT
Abstract This study analyzed the responses of 24 sessions of High Intensity Interval Training (HIIT) and Continuous Moderate (CM) on tissue damage, oxidative stress and glycemic profile of rats in liquid medium. Twenty-four Wistar rats participated, divided into three groups: sedentary (GSED), the one who performed the HIIT (GHIIT) and the one who performed the CM (GCM). Performed three times a week alternately for 8 weeks, and the GHIIT performed 20 seconds of exercise for 10 rest. The CM was a moderate intensity swim. GHIIT increased creatine kinase compared to GSED (GSED: 140.40 + 35.48 U / I; GHIIT: 442.60 + 8.35 U / I; p = 0.0008, representing a percentage increase of 215.24); lactate dehydrogenase was increased in GHIIT and GCM compared to GSED (GSED: 112.8 + 28.08 U / I; GHIIT: 250.9 + 70.67 U / I, a percentage increase of 122.42; GCM: 241.8 + 100.70 U / I, with a percentage increase 114.36; p = 0.006), in contrast, GHIIT increased non-oxidized liver sulfhydryls compared to GCM (GHIIT: 498.70 + 214.30 nmol / ml; GCM: 270.50 + 104.40 nmol / ml, the percentage change was 84.36; p = 0.03). There was greater glycemic maintenance in the GCM (p = 0.0002). It is concluded that the protocols of HIIT and CM, of this study, point to a possible tissue injury, in contrast, HIIT develops the adaptive capacity of the hepatic antioxidant system and the CM promotes greater glycemic support.
Resumo Este estudo analisou as respostas de 24 sessões de High Intensity Interval Training (HIIT) e Contínuo Moderado (CM) sobre a lesão tecidual, estresse oxidativo e perfil glicêmico de ratos em meio líquido. Participaram 24 ratos Wistar, divididos em três grupos: sedentário (GSED), o que fez o HIIT (GHIIT) e o que executou o CM (GCM). Realizados três vezes semanais alternadamente por 8 semanas, sendo que o GHIIT executou 20 segundos de exercício por 10 de descanso. O CM foi um nado de intensidade moderada. O GHIIT aumentou a creatina quinase em relação ao GSED (GSED: 140.40 ± 35.48 U/I; GHIIT: 442.60 ± 8.35 U/I; p=0.0008, representando um aumento percentual de 215.24); a lactato desidrogenase foi aumentada no GHIIT e GCM em relação ao GSED (GSED: 112.8 ± 28.08 U/I; GHIIT: 250.9 ± 70.67 U/I, um aumento percentual de 122.42; GCM: 241.8 ± 100.70 U/I, com aumento percentual de 114.36; p=0.006), em contrapartida, o GHIIT aumentou as sulfidrilas hepáticas não oxidadas em relação ao GCM (GHIIT: 498.70 ± 214.30 nmol/ml; GCM: 270.50 ± 104.40 nmol/ml, a variação percentual foi de 84.36; p=0.03). Houve maior manutenção glicêmica no GCM (p=0.0002). Conclui-se que os protocolos de HIIT e CM, deste estudo, apontam para a uma possível lesão tecidual, em contrapartida, o HIIT desenvolve a capacidade de adaptação do sistema antioxidante hepático e o CM promove uma sustentação glicêmica maior.