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Early exercise training improves ischemic outcome in rats by cerebral hemodynamics
Shan Tian1, Youcan Zhang, Song Tian
1Department of Rehabilitation, Huashan Hospital, Fudan University, Shanghai 200040, China.
Brain Research
|August 17, 2013
Summary
Very early physical rehabilitation improved motor function and cerebral blood flow in rats post-stroke. This early intervention reduced brain damage and cell death, highlighting its therapeutic potential.
Area of Science:
- Neuroscience
- Rehabilitation Medicine
- Cerebrovascular Research
Background:
- Ischemic stroke, caused by middle cerebral artery occlusion (MCAO), leads to motor deficits and cerebral blood flow (CBF) reduction.
- Early rehabilitation is recommended post-ischemia, but its specific effects on motor function and CBF require further elucidation.
Purpose of the Study:
- To investigate the impact of very early initiated physical rehabilitation (VEIPR) on motor performance and CBF in an MCAO rat model.
- To determine if improved CBF mediates the neuroprotective effects of VEIPR by examining endothelial cell apoptosis.
Main Methods:
- Adult male rats underwent MCAO and were subjected to treadmill exercise (30 min/day at 12 m/min) for 3 days.
- Motor function was assessed using a behavioral score, infarct volume by 2,3,5-triphenyltetrazolium chloride (TTC) staining, and CBF using laser speckle imaging (LSI).
- Apoptosis of rat brain microvascular endothelial cells (rBMECs) under varying flow conditions was analyzed to assess the role of CBF.
Main Results:
- VEIPR significantly improved motor function and reduced infarct volume in ischemic rats.
- Exercise training accelerated CBF recovery, as detected by LSI.
- Modest but not excessive blood flow reduced rBMEC apoptosis in ischemic conditions, suggesting a magnitude-dependent protective effect.
Conclusions:
- Very early initiated physical rehabilitation is effective in improving motor recovery and cerebral blood flow post-ischemia.
- Accelerated CBF and reduced endothelial cell apoptosis appear to be key mechanisms underlying the benefits of VEIPR.
- These findings support the implementation of early rehabilitation strategies for stroke recovery.
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