1. Treating Traumatic Brain Injury with Exercise: Onset Delay and Previous Training as Key Factors Determining its Efficacy.
- Author
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Sánchez-Martín T, Costa-Miserachs D, Coll-Andreu M, Portell-Cortés I, García-Brito S, and Torras-Garcia M
- Subjects
- Animals, Male, Rats, Disease Models, Animal, Hippocampus pathology, Hippocampus physiopathology, Exercise Therapy methods, Time Factors, Cognitive Dysfunction etiology, Cognitive Dysfunction rehabilitation, Cognitive Dysfunction physiopathology, Cognitive Dysfunction therapy, Neurons pathology, Neurons physiology, Memory Disorders etiology, Memory Disorders rehabilitation, Memory Disorders physiopathology, Memory Disorders therapy, Neuroinflammatory Diseases etiology, Neuroinflammatory Diseases physiopathology, Recognition, Psychology physiology, Brain Injuries, Traumatic physiopathology, Brain Injuries, Traumatic pathology, Brain Injuries, Traumatic therapy, Brain Injuries, Traumatic rehabilitation, Physical Conditioning, Animal physiology, Rats, Sprague-Dawley
- Abstract
Purpose: Exercise reduces cognitive deficits in traumatic brain injury (TBI), but early post-trauma exercise is often discouraged due to potential harm. The purpose was to evaluate the interaction between pre- and post-injury physical exercise on cognition, neuronal survival and inflammation., Methods: Rats were either sham-operated and kept sedentary (Sham) or subjected to controlled cortical impact injury and then distributed into sedentary (Tbi), pre-injury exercise (Pre-Tbi), post-injury exercise with early (24 hours, Tbi-early) or late (6 days, Tbi-late) onset, and a combination of pre- and post-injury exercise with early (Pre-Tbi-early) or late (Pre-Tbi-late) onset. Object recognition memory, hippocampal volume, neuronal survival (NeuN
+ ) in the hippocampus and perirhinal cortex, and microglial activity (Iba-1) in the hippocampus were evaluated., Results: All exercise conditions, except TBI-early, attenuated the significant memory impairment at 24-hour retention caused by TBI. Additionally, Pre-TBI-early treatment led to memory improvement at 3-hour retention. Pre-TBI reduced neuronal death and microglial activation in the hippocampus. TBI-late, but not TBI-early, mitigated hippocampal volume loss, loss of mature neurons in the hippocampus, and inflammation. Combining pre-injury and early-onset exercise reduced memory deficits but did not affect neuronal death or microglial activation. Combining pre-injury and late-onset exercise had a similar memory-enhancing effect than late post-injury treatment alone, albeit with reduced effects on neuronal density and neuroinflammation., Conclusions: Pre-TBI physical exercise reduces the necessary onset delay of post-TBI exercise to obtain cognitive benefits, yet the exact mechanisms underlying this reduction require further research., Competing Interests: Declaration of Conflicting InterestsThe author(s) declared no potential conflicts of interest with respect to the research, authorship, and/or publication of this article.- Published
- 2024
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