Correlation between leg extensor torque and the degree of sway.
Takashi Yoshizawa, Masahiro Kitamura, Nobuhiro Okamoto
PMID 33132522WHAT IT FOUND
In healthy men, stronger leg extension was associated with less one-leg sway; in healthy women, no such association was seen.
This does not show strengthening reduces sway in patients.
Key findings
01Fifty-three healthy adults with no leg problems were recruited.
02Leg extensor torque differed significantly between genders, but degree of sway did not.
03Males showed significant negative correlations between leg extensor torque and sway measures, while females showed no significant correlations.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The participants were healthy adults with no leg problems, so the findings may not apply to older patients, post-surgical patients, or people with balance or mobility problems. The study measured a relationship at one time point; it did not test an intervention, so it cannot show that increasing leg extensor torque causes a reduction in sway. The association was present only in men and absent in women, so it does not support one general rule for all patients. The paper did not report outcomes for clinical populations or follow-up.
Declared interests
The authors declared no conflicts of interest.
The easy way to misread this
Do not conclude that leg strengthening will reduce sway in patients. The study measured healthy adults and found only an association in men, not women, so it does not show that increasing torque causes less sway.