A short bout of high-intensity exercise alters ipsilesional motor cortical excitability post-stroke.
Xin Li, Charalambos C Charalambous, Darcy S Reisman and 1 others
PMID 31144609WHAT IT FOUND
Five minutes of fast treadmill walking increased brain excitability in the damaged hemisphere in stroke survivors.
This short priming bout may prepare the brain for therapy, but the study did not show that it improves actual movement or function.
Key findings
01Resting motor evoked potentials in the lesioned hemisphere were significantly larger after five minutes of high-intensity exercise compared to rest.
02The exercise increased blood lactate levels, confirming participants reached high intensity.
03The study did not find changes in intracortical inhibition or excitability in the non-lesioned hemisphere.
STILL TO COME
How it was doneWhat they foundWhat it means for PTsWhat it means for OTsWhat it means for SLPs
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What it does not show
The sample size was very small (13 participants), and data from the lesioned hemisphere was missing for many participants, reducing the statistical power. The study measured brain excitability, not actual motor function or learning, so it is unknown if these physiological changes translate to better movement. It was a pilot study without a formal power calculation, intended only to test feasibility. The crossover design did not randomize the order of sessions, which could introduce bias. Maximal heart rate was estimated rather than measured, which can be inaccurate.
Declared interests
The authors declare no conflicts of interest. The work was supported by the National Institutes of Health (N.I.H.).
The easy way to misread this
Do not assume this exercise improves patient function. The study only showed a change in brain excitability, not in motor performance or recovery. It is a proof-of-concept for the physiological effect, not evidence of clinical efficacy.