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Ribeiro LFP, Teixeira IP, Aparecido da Silva G, Dalia RA, Júnior MC, Bertolini NO, Rostom de Mello MA, Luciano E. Effects of swimming training on tissue glycogen content in experimental thyrotoxic rats. Can J Physiol Pharmacol 2012; 90:587-93. [DOI: 10.1139/y2012-044] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [Abstract] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/22/2022]
Abstract
Thyrotoxicosis, a condition in which there is an excessive amount of circulating thyroid hormones, leads to reduced glycogen content in different tissues. In this study we analyzed the effects of aerobic swimming training on liver, heart, and skeletal muscle glycogen content in experimentally induced thyrotoxicosis. Wistar male rats were divided into euthyroid sedentary (ES, n = 12), euthyroid trained (ET, n = 11), thyrotoxic sedentary (TS, n = 12), and thyrotoxic trained (TT, n = 10) groups. Thyrotoxic groups received daily i.p. doses of T4 (sodium levothyroxine, 25 µg/100 g body mass) through the experimental period, and trained groups swam for 1 h at 80% of the aerobic–anaerobic transition intensity, 5 days/week for 4 weeks. Heart and liver glycogen stores were ∼30% lower in T4 treated compared with nontreated groups, but were not changed by training status. On the other hand, glycogen content in mixed fiber type gastrocnemius of TT was 1.5- to 2.3-fold greater than those in other groups, whereas no significant differences were found for the slow soleus muscle. Increased gastrocnemius but not soleus, liver, or heart glycogen indicates that in mild long-term thyrotoxicosis chronic swimming affects glycogen stores in a tissue-specific manner.
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Affiliation(s)
- Luiz Fernando Paulino Ribeiro
- Departamento de Ciências da Saúde, Universidade Estadual de Santa Cruz, Ilhéus-Itabuna, Bahia 45662-900, Brazil
- Departamento de Educação Física, Instituto de Biociências, Universidade Estadual Paulista, Avenida 24A, No. 1515, Bela Vista, Rio Claro, São Paulo 13506-900, Brazil
| | - Inaian Pignatti Teixeira
- Departamento de Educação Física, Instituto de Biociências, Universidade Estadual Paulista, Avenida 24A, No. 1515, Bela Vista, Rio Claro, São Paulo 13506-900, Brazil
| | - Glaucio Aparecido da Silva
- Departamento de Educação Física, Instituto de Biociências, Universidade Estadual Paulista, Avenida 24A, No. 1515, Bela Vista, Rio Claro, São Paulo 13506-900, Brazil
| | - Rodrigo Augusto Dalia
- Departamento de Educação Física, Instituto de Biociências, Universidade Estadual Paulista, Avenida 24A, No. 1515, Bela Vista, Rio Claro, São Paulo 13506-900, Brazil
| | - Marcelo Costa Júnior
- Departamento de Educação Física, Instituto de Biociências, Universidade Estadual Paulista, Avenida 24A, No. 1515, Bela Vista, Rio Claro, São Paulo 13506-900, Brazil
| | - Natalia Oliveira Bertolini
- Departamento de Educação Física, Instituto de Biociências, Universidade Estadual Paulista, Avenida 24A, No. 1515, Bela Vista, Rio Claro, São Paulo 13506-900, Brazil
| | - Maria Alice Rostom de Mello
- Departamento de Educação Física, Instituto de Biociências, Universidade Estadual Paulista, Avenida 24A, No. 1515, Bela Vista, Rio Claro, São Paulo 13506-900, Brazil
| | - Eliete Luciano
- Departamento de Educação Física, Instituto de Biociências, Universidade Estadual Paulista, Avenida 24A, No. 1515, Bela Vista, Rio Claro, São Paulo 13506-900, Brazil
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