Evidence
Brain Inj. 2024 May 5:1-8. doi: 10.1080/02699052.2024.2349144. Online ahead of print.
ABSTRACT
PRIMARY OBJECTIVE: It is unclear of the correlation between a mild traumatic brain injury (mTBI) and repeated subconcussive (RSC) impacts with respect to injury biomechanics. Thus, the present study was designed to determine the behavioral and histological differences between a single mTBI impact and RSC impacts with subdivided cumulative kinetic energies of the single mTBI impact.
RESEARCH DESIGN: Adult male Sprague-Dawley rats were randomly assigned to a single mTBI impact, RSC impact, sham, or repeated sham groups.
METHODS AND PROCEDURES: Following a weight drop injury, anxiety-like behavior and general locomotive activity and were assessed using the open field test, while motor coordination was evaluated using a rotarod unit. Neuronal loss, astrogliosis, and microgliosis were assessed using NeuN, GFAP and Iba-1 immunohistochemistry. All assessments were undertaken at 3- and 7-days post impact.
MAIN OUTCOMES AND RESULTS: No behavioral disturbances were observed in injury groups, however, both injury groups did lead to microgliosis following 3-days post-impact.
CONCLUSIONS: No pathophysiological differences were observed between a single mTBI impact and RSC impacts of the same energy input. Even though a cumulative injury threshold for RSC impacts was not determined, a threshold still may exist where no pathodynamic shift occurs.
PMID:38704844 | DOI:10.1080/02699052.2024.2349144
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