Glycogen Kinetics of Wistar Rats: Different Exercise Intensities and Tissue Analyzed Influence.
Carlos Dellavechia DE Carvalho, Carlos Augusto Kalva Filho, Alisson Luiz DA Rocha, Adelino Sanchez Ramos Silva, Marcelo Papoti
Author Information
Carlos Dellavechia DE Carvalho: Ribeirão Preto Medical School, University of São Paulo, SP, BRAZIL.
Carlos Augusto Kalva Filho: Physical Education, School of Sciences, São Paulo State University, SP, BRAZIL.
Alisson Luiz DA Rocha: Postgraduate Program in Rehabilitation and Functional Performance, Ribeirão Preto Medical School, University of São Paulo, SP, BRAZIL.
Adelino Sanchez Ramos Silva: Postgraduate Program in Rehabilitation and Functional Performance, Ribeirão Preto Medical School, University of São Paulo, SP, BRAZIL.
Marcelo Papoti: Ribeirão Preto Medical School, University of São Paulo, SP, BRAZIL.
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; 9); low intensity training session (G; 24; 48 minutes at 50% of MRS); moderate intensity group (G; 24; 32 minutes at 75% of MRS) and high intensity group (G; 24; 5x5 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 ( 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.
