The Role of Inter-Set Rest Periods in High-Intensity Interval Training on Acute Glucose and Insulin Sensitivity in Type I Diabetic Children: A Randomized Crossover Study
João Coutinho Barroso Júnior
University of Vassouras, Saquarema, Rio de Janeiro, Brazil.
Hugo Vinicius de Oliveira Silva
University of Vassouras, Saquarema, Rio de Janeiro, Brazil.
Cristiano de Oliveira Silva
University of Vassouras, Saquarema, Rio de Janeiro, Brazil.
Jani Cleria Pereira Bezerra
University of Vassouras, Saquarema, Rio de Janeiro, Brazil.
Carlos Eduardo Rafael de Andrade Ferrari
University of Vassouras, Saquarema, Rio de Janeiro, Brazil.
João Rafael Valentim-Silva *
University of Vassouras, Saquarema; Researcher at Federal University of State of Rio de Janeiro, Rio de Janeiro; Researcher at Federal University of Santa Catarina, Florianópolis, and at Education and Technology College; Ananindeua, Pará, Brazil.
*Author to whom correspondence should be addressed.
Abstract
Aims: To investigate the impact of different inter-set rest periods on blood glucose levels and insulin sensitivity (IS) in children with type 1 diabetes.
Study Design: An experimental randomized crossover trial.
Place and Duration: Recruitment took place in the public health network of Rio Branco, Acre, Brazil.
Methodology: Twenty subjects participated in three different HIIT protocols with varying rest intervals. The first protocol consisted of 20 seconds of exercise followed by 10 seconds of rest (HIIT20-10), the second with 20 seconds of rest (HIIT20-20), and the third with 60 seconds of rest (HIIT20-60). The exercise used in all protocols was the burpee, performed at maximum effort for a total of 12 minutes, comprising 24 sets. Blood glucose levels were measured through finger-prick tests before exercise, immediately after, and at 15, 30,60,and120 minutes post-exercise. For insulin sensitivity, 4 ml of venous blood was drawn before, immediately after, and at 30, 60, and 120minutes post-exercise, and the TyG Index was used to calculate IS.
Results: No significant differences were observed between the HIIT20-20 and HIIT20-60 groups (p>0.05) regarding glucose levels. However, the HIIT20-10 protocol showed significantly lower glucose levels from 15 minutes to 120 minutes post-exercise (p<0.05) and improved IS at 60 minutes (p<0.05) and 120 minutes (p<0.01) after the exercise session.
Conclusion: The inter-set rest period influences glucose metabolism during HIIT in children with type 1 diabetes.
Keywords: Metabolic health, glucose metabolism, type I diabetes, high-intensity interval training, insulin sensitivity