Exercise Maintains Dendritic Complexity In An Animal Model Of Posttraumatic Stress Disorder

Keywords

BRAIN; HIPPOCAMPUS; PHYSICAL ACTIVITY; POSTTRAUMATIC STRESS DISORDER; TRAINING

Abstract

Introduction This study examined the effect of endurance exercise on dendritic arborization in the dentate gyrus subregion in rodents exposed to a predator scent stress (PSS). Methods Sprague-Dawley rats were randomly assigned to one of four treatment groups. In two of the groups, rats were unexposed to PSS but either remained sedentary (SED + UNEXP) or were exercised (EX + UNEXP). In the other two groups, rats were exposed to the PSS but either remained sedentary (SED + PSS) or were exercised (EX + PSS). After 6 wk of either exercise or sedentary lifestyle, rats were exposed to either the PSS or a sham protocol. During exercise, the animals ran on a treadmill at 15 m·min-1, 5 min·d-1 gradually increasing to 20 min·d-1, 5 d·wk-1 for 6 wk. Eight days after exposure to either PSS or sham protocol, changes in the cytoarchitecture (dendritic number, dendritic length, and dendrite spine density) of the dentate gyrus subregion of the hippocampus were assessed. Results No differences (P = 0.493) were noted in dendritic number between the groups. However, dendritic length and dendrite spine density for SED + PSS was significantly smaller (P < 0.001) than that observed in all other groups. In addition, neurons from animals in SED + PSS had significantly fewer (P < 0.001) dendritic intersections than all other groups. Conclusion The results of this study indicate that 6 wk of endurance training can protect dendritic length and complexity, suggesting a degree of resiliency to stress. This provides further evidence for supporting the inclusion of an exercise regimen for reducing the risk of posttraumatic stress disorder.

Publication Date

12-1-2016

Publication Title

Medicine and Science in Sports and Exercise

Volume

48

Issue

12

Number of Pages

2487-2494

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1249/MSS.0000000000001038

Socpus ID

84978531276 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/84978531276

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