The effect of aerobic exercise on hippocampal local field potentials in adult male rats: evaluating the role of olfactory bulb pathway
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Authors
1Physical Education & Sport Sciences Department, Faculty of Humanities, Tarbiat Modares University, Tehran, Iran
2Department of Exercise Physiology & Sport Sciences, Faculty of Humanities, Tarbiat Modares University, Tehran, Iran
3Department of Physiology, Faculty of Medical Sciences, Tarbiat Modares University, Tehran, Iran
Abstract
Recent studies have supported the claim that physical activity plays a role in brain health. There is considerable evidence that exercise can promote the health and function of the central nervous system (CNS). The respiratory system is one of the most important and effective systems involved in physical activity. Studies about non-respiration of the nose have shown neurological disorders, including memory loss and cognitive impairment.
During the breathing cycle, airflow through the nose stimulates the olfactory bulb (OB), which is associated with the intensity of the airflow. Olfactory signals go to the entorhinal cortex, dentate gyrus and CA1 in the hippocampus, piriform cortex (PFC), amygdala, and parts of the brain. While there is considerable support in the literature for the beneficial effects of exercise on cognitive performance in both general and older population, there is a paucity of research investigating the mechanisms which may serve to mediate this relationship.
For this purpose, 12 adult rats divided into two groups, exercise and rest. Exercise group had aerobic exercise on a treadmill one hour per day and five days per week for eight weeks. At the beginning of the study, electrodes implanted in the OB and DG of the hippocampus for LFP recording.
Aerobic Exercise by nasal breathing changed the hippocampal signal through the olfactory bulb.
Nasal breathing has beneficial as compared to oral breathing in normals and nasal health is clearly of key importance to the athlete. We suggest that aerobic exercise with nasal breathing can change the hippocampal signal through the olfactory bulb.
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