High-intensity resistance training induces changes in cognitive function, but not in locomotor activity or anxious behavior in rats induced to type 2 diabetes

• Published in: Physiology & behavior 2020-09, Vol.223, p.112998-112998, Article 112998
• Main Authors: De Sousa, Ricardo Augusto Leoni, Improta-Caria, Alex Cleber, Jesus-Silva, Francine Menezes de, Magalhães, Caique Olegário Diniz e, Freitas, Daniel Almeida, Lacerda, Ana Cristina Rodrigues, Mendonça, Vanessa Amaral, Cassilhas, Ricardo Cardoso, Leite, Hércules Ribeiro
• Format: Article
• Language: English
• Subjects: Cognition; Diabetes; Memory; Physical exercise; Strength training
• ISSN: 0031-9384; 1873-507X
• DOI: 10.1016/j.physbeh.2020.112998

•T2D main feature is insulin resistance, which is the hallmark of cognitive decline.•Resistance training is a non-pharmacological tool that ameliorates T2D features.•Locomotor activity or anxious behavior are not significantly altered in T2D rats.•T2D rats preserved cognition after 4 weeks of high-intensity resistance training.•T2D rats which did not perform resistance training presented cognitive impairment. Type 2 diabetes (T2D) is a metabolic disorder that can lead to cognitive decline through impairment of insulin signaling. Resistance training, a type of physical exercise, is a non-pharmacological approach used to improve insulin resistance in T2D. The aim of our study was to evaluate the effects of high-intensity resistance training (HIRT) over cognitive function, locomotor activity, and anxious behavior in rats induced to T2D. Thirty young adult male wistar rats were distributed into 3 groups (n = 10): Control; dexamethasone (D); and dexamethasone + exercise (DE), that performed the HIRT during 4 weeks. Blood glucose, water intake, and total body fat were measured. Locomotor activity, and anxious behavior where evaluated through the open field task. Cognitive function was assessed through the novel object recognition task. Insulin resistance and neuronal death were evaluated through western blot analysis. Rats induced to T2D had higher blood glucose levels, and consumed more water when compared to control group, but DE had better blood glucose levels than D. Total body fat was reduced in DE compared to D. Locomotor activity, and anxious behavior were not significantly altered. T2D rats which performed HIRT maintained cognitive function, while those induced to T2D that did not exercise developed cognitive decline. DE group showed a reduction in the inhibition of the activation of hippocampal IRS-1 and higher expression of GSk3β phosphorylated in serine compared to D group, revealing insulin signaling impairment, and neuronal death were identified in the hippocampus of D group. Lifestyle intervention through the regular practice of HIRT plays a fundamental role in the treatment of T2D preventing cognitive decline.