Acute physical exercise improves recognition memory via locus coeruleus activation but not via ventral tegmental area activation

• Published in: Physiology & behavior Vol. 272; p. 114370
• Main Authors: Lima, Karine Ramires, Neves, Ben-Hur Souto das, Carrazoni, Guilherme Salgado, Rosa, Ana Carolina de Souza da, Carriço, Murilo Ricardo Sigal, Roehrs, Rafael, Mello-Carpes, Pâmela Billig
• Format: Journal Article
• Language: English
• Published: Elsevier Inc 01.12.2023
• Subjects: Dopamine; Memory persistence; Noradrenaline; Physical activity; Treadmill; Memory persistence; Dopamine; Physical activity; Treadmill; Noradrenaline
• ISSN: 0031-9384; 1873-507X
• DOI: 10.1016/j.physbeh.2023.114370

•Acute physical exercise improves memory persistence in rats.•Novel object recognition memory is improved by acute physical exercise.•Locus coeruleus is required to acute physical exercise effects on memory.•Ventral tegmental area is not required to acute physical exercise effects on memory. Both animals and humans have been studied to explore the impact of acute physical exercise (PE) on memory. In rats, a single session of PE enhances the persistence of novel object recognition (NOR) memory, which depends on dopamine and noradrenaline activity in the hippocampus. However, limited research has examined the involvement of other brain regions in this phenomenon. In this study, we investigated the role of the ventral tegmental area (VTA) and locus coeruleus (LC) in modulating the persistence of NOR memory induced by acute PE. After NOR training, some animals underwent a 30 min treadmill PE session, followed by infusion of either vehicle (VEH) or muscimol (MUS) in either the VTA or LC. Other animals did not undergo PE and only received VEH, MUS, or NMDA within the same time window. We evaluated memory recall 1, 7, and 14 days later. Acute PE promoted memory persistence for up to 14 days afterward, similar to NMDA glutamatergic stimulation of the VTA or LC. Moreover, only the LC region was required for the memory improvement induced by acute PE since blocking this region with MUS impaired NOR encoding. Our findings suggest that acute PE can improve learning within a closed time window, and this effect depends on LC, but not VTA, activity.