Vol 15, Issue 2

Glycogen Kinetics of Wistar Rats: Different Exercise Intensities and Tissue Analyzed Influence

February 15, 2022 - By 

Authors

Carlos Dellavechia de Carvalho, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Avenida Bandeirantes, 3900, Monte Alegre, BrazilFollow
Carlos Augusto Kalva-Filho, Physical Education, School of Sciences, São Paulo State University (Unesp), Bauru, Av. Eng. Luís Edmundo Carrijo Coube, 14-01 – Nucleo Res. Pres. Geisel, Brazil
Alisson Luiz da Rocha, Postgraduate Program in Rehabilitation and Functional Performance, Ribeirão Preto Medical School, University of São Paulo (USP), Ribeirão Preto, Avenida Bandeirantes, 3900, Monte Alegre, Brazil
Adelino Sanchez Ramos da Silva, Postgraduate Program in Rehabilitation and Functional Performance, Ribeirão Preto Medical School, University of São Paulo (USP), Ribeirão Preto, Avenida Bandeirantes, 3900, Monte Alegre, Brazil; School of Physical Education and Sport of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Avenida Bandeirantes, 3900, Monte Alegre, Brazil
Marcelo Papoti, Ribeirão Preto Medical School, University of São Paulo, Ribeirão Preto, Avenida Bandeirantes, 3900, Monte Alegre, Brazil; School of Physical Education and Sport of Ribeirão Preto, University of São Paulo, Ribeirão Preto, Avenida Bandeirantes, 3900, Monte Alegre, Brazil
International Journal of Exercise Science 15(2): 289-299, 2022.
DOI: 10.70252/DAEM9945

Abstract

The aim of this study is to verify the influence of the intensity on muscle and hepatic glycogen depletion and recovery kinetics of Wistar rats, submitted to three acute training sessions with equalized loads. 81 male Wistar rats performed an incremental test to determine maximal running speed (MRS) and divided into 4 groups: baseline group (Control; n = 9); low intensity training session (GZ1; n = 24; 48 minutes at 50% of MRS); moderate intensity group (GZ2; n = 24; 32 minutes at 75% of MRS) and high intensity group (GZ3; n = 24; 5×5 minutes and 20 seconds at 90% of MRS). Immediately after the sessions and after 6, 12 and 24 hours, 6 animals from each subgroup were euthanized for glycogen quantification in soleus and EDL muscles and liver. A Two-Way ANOVA and the Fisher’s Post-hoc test was used (p < 0.05). Glycogen supercompensation occurred between 6 and 12 hours after exercise in muscle tissue and 24 after exercise in the liver. The muscle and hepatic glycogen depletion and recovery kinetics are not modulated by exercise intensity since the load was equalized, but effects were distinct in different tissues. Hepatic glycogenolysis and muscle glycogen synthesis processes seem to run in parallel.

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