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1 Department of Physical Therapy, University of Texas Southwestern, Dallas, TX, USA; Department of Health Care Sciences, University of Texas Southwestern, Dallas, TX, USA
2 Department of Radiology, University of Texas Southwestern, Dallas, TX, USA
* To whom correspondence should be addressed. E-mail: jon.williamson{at}utsouthwestern.edu.
The investigation compared patterns of regional cerebral blood flow (rCBF) during exercise recovery both with and without post-exercise hypotension (PEH). Eight subjects were studied on three different days under randomly assigned conditions: i.) after 30 min of rest; ii.) after 30 min of moderate exercise (M-Ex) at 60-70% heart rate reserve (HRR) during PEH; and iii.) after 30 min of light exercise (L-Ex) at 20% HRR with no PEH. Data were collected for HR, mean blood pressure (MBP), ratings of perceived exertion (RPE) and relaxation (RPR), and rCBF was assessed using single photon emission computed tomography. Using ANOVA across conditions, there were differences (P < 0.05; mean ±SD) from rest during exercise recovery from M-Ex (HR = +12 ±3 bpm; MBP = -9 ±2 mmHg), but not from L-Ex (HR = +2 ±2 bpm; MBP = -2 ±2 mmHg). Following M-Ex, there were decreases (P < 0.05) for the anterior cingulate (-6.7 ±2%), right and left inferior thalamus (-10 ±3%), right inferior insula (-13 ±3%) and left inferior anterior insula (-8 ±3%), not observed after L-Ex. There were rCBF decreases for leg sensorimotor regions following both M-Ex (-15 ±4%) and L-Ex (-12 ±3%), and for the left superior anterior insula (-7 ±3% and -6 ±3%), respectively. Data show that there are rCBF reductions within specific regions of the insular cortex and anterior cingulate cortex coupled with a post-exercise hypotensive response following M-Ex. Findings suggest that these cerebral cortical regions, previously implicated in cardiovascular regulation during exercise, may also be involved in post-exercise hypotension.
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