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Repeated Long-Term Sub-concussion Impacts Induce Motor Dysfunction in Rats: A Potential Rodent Model.
Andrew P Lavender1,2, Samuel Rawlings2, Andrew Warnock3,4
1School of Health and Life Sciences, Federation University, Ballarat, VIC, Australia.
Frontiers in Neurology
|June 18, 2020
Summary
Repeated sub-concussive impacts did not cause immediate neuromotor dysfunction in rats. However, long-term exposure over 12 weeks led to moderate dysfunction, revealing potential mechanisms for brain injury.
Area of Science:
- Neuroscience
- Neurology
- Traumatic Brain Injury Research
Background:
- Detrimental effects of repeated sub-concussive impacts on neurophysiology and behavior are increasingly recognized.
- The underlying mechanisms of these effects remain largely unknown.
- Sub-concussive impacts are common in sports and military settings, necessitating research into their long-term consequences.
Purpose of the Study:
- To investigate the development of neuromotor dysfunction following repeated sub-concussive impacts in a rat model.
- To establish a timeline for the emergence of behavioral deficits after long-term sub-concussive exposure.
- To provide a foundation for future research into the mechanisms of sub-concussion-induced neuropsychological changes.
Main Methods:
- Wild-type PVG rats were subjected to repeated sub-concussion using a standardized light weight drop (25 g).
- Neuromotor function was assessed using the beamwalk and rotarod tests at different time points (2 weeks and 12 weeks).
- The study focused on behavioral outcomes as indicators of neurological impairment.
Main Results:
- No detectable neuromotor dysfunction was observed after 2 weeks of repeated sub-concussive impacts.
- Moderate neuromotor dysfunction became evident in rats after 12 weeks of repeated sub-concussive impacts.
- This study is the first to demonstrate the development of neuromotor dysfunction following long-term, multiple sub-concussive impacts in rats.
Conclusions:
- Repeated sub-concussive impacts do not induce immediate neuromotor deficits.
- Long-term exposure to sub-concussive impacts can lead to the development of significant neuromotor dysfunction.
- These findings highlight the importance of considering the cumulative effects of sub-concussive impacts and offer a model for studying underlying mechanisms.
