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Effect of high-intensity interval training on the skeletal muscle of spontaneously hypertensive rats

Abstract Aim: This study aimed to evaluate the effect of High-Intensity Interval Training (HIIT) on the skeletal muscle of Spontaneously Hypertensive Rats (SHR). Method: In total, 20 male rats, SHR, 12 months old, were used, distributed into 2 groups: Control Group (C) and Training Group (HIIT). The...

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Main Authors: Paulo Henrique Aleixo (Author), Robson Chacon Castoldi (Author), Francilene Lima Agostinho De Souza (Author), Thaoan Bruno Mariano (Author), Guilherme Akio Tamura Ozaki (Author), Thiago Alves Garcia (Author), Lucas Silva Santos (Author), Francis Lopes Pacagnelli (Author), Regina Celi Trindade Camargo (Author), José Carlos Silva Camargo Filho (Author)
Format: Book
Published: Universidade Estadual Paulista (UNESP), 2021-05-01T00:00:00Z.
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Summary:Abstract Aim: This study aimed to evaluate the effect of High-Intensity Interval Training (HIIT) on the skeletal muscle of Spontaneously Hypertensive Rats (SHR). Method: In total, 20 male rats, SHR, 12 months old, were used, distributed into 2 groups: Control Group (C) and Training Group (HIIT). The training lasted approximately 50 minutes/day, 5 days/week, for 8 weeks. Systolic blood pressure (BP) was measured at the beginning and end of the study. Analysis: The medial gastrocnemius muscle was used to measure the smallest fiber diameter, after which the Shapiro-Wilk normality test was performed, followed by the Mann Whitney test to compare the medians and interquartile intervals (IQI) of the muscle fibers and Student t-test for performance. For analysis of BP, Analysis of Variance - ANOVA was used, followed by Tukey's post-test. All procedures adopted a significance value of 5% (p < 0.05). Results: The median values for the variable "smallest diameter" of muscle fibers were 29.48 (IQI: 9.96) µm in the C group and 33.45 (IQI: 9.44) µm in the HIIT group (p < 0.05). Also, the performance was increased in the trained animal group and blood pressure values decreased significantly at the end of the experiment (p < 0.05). Conclusion: The HIIT intensity promoted an increase in the median values of the muscle fibers and performance. Finally, a significant decrease was observed in blood pressure variation values.
Item Description:1980-6574
10.1590/s1980-65742021020921

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