The Differential Effects of Fast Walking Speed on Muscle Coactivation in the Paretic and Non-Paretic Extremities Post-Stroke.
Natalia Sánchez, Andrian Kuch, Samantha N Jeffcoat and 5 others
PMID 41342477WHAT IT FOUND
Fast walking acutely reduced muscle coactivation in the paretic leg, while slow walking increased it.
This suggests fast speeds may help restore selective motor control, whereas slow speeds might reinforce stiff, maladaptive patterns.
Key findings
01Walking at speeds slower than self-selected significantly increased muscle coactivation in both stroke survivors and controls.
02In the paretic leg, coactivation decreased as speed increased, with the lowest coactivation predicted at speeds roughly 120% above self-selected.
03Heart rate was not associated with muscle coactivation, despite both being influenced by walking speed.
STILL TO COME
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What it does not show
Not all participants completed all speed conditions, leading to varying sample sizes. Most stroke participants had mild-to-moderate impairment (Fugl-Meyer scores), so results may not apply to those with severe hemiparesis. Heart rate data was only collected from one site (16 participants). The study measured acute effects; it did not determine if these changes in coactivation persist or lead to long-term functional recovery. Fast speeds achieved by stroke participants were still within the range of self-selected speeds for controls, limiting the ability to test very high intensities.
Declared interests
The authors declared no potential conflicts of interest.
The easy way to misread this
Do not assume that fast walking is universally safe or effective for all stroke survivors. The study excluded individuals with severe impairment, and the benefits of speed on coactivation were linked to better baseline balance and motor function. Additionally, the reduction in coactivation was an acute physiological change, not a proven long-term functional outcome.
Summarised by AI from the full paper, without a clinician reviewing it. Check it against the source before it changes what you do. Read it on PubMed →