Lower Limb Ground Reaction Force and Center of Pressure Asymmetry During Bodyweight Squats.
Kelci B Hannan, Adam C King
PMID 36237648WHAT IT FOUND
Bodyweight squats in 18 healthy active adults were not symmetrical between legs: the preferred leg produced higher peak force when self-paced, and the non-preferred leg showed less foot-pressure sway.
Metronome pacing changed the leg force pattern.
Key findings
01During self-paced bodyweight squats, the preferred leg produced higher peak vertical ground reaction force than the non-preferred leg.
02The non-preferred leg had lower center-of-pressure variability than the preferred leg in front-back and side-to-side directions.
03Force impulse was similar between legs during metronome squats, but the non-preferred leg had greater impulse during self-paced squats.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The study included only 18 healthy, physically active young adults, so it does not show how injured or rehabilitation patients squat. Squat depth was left at a comfortable depth and only observed by a researcher, so depth may have varied between people and repetitions. Preferred limb was defined by kicking a ball, not by strength, injury, or sport-specific dominance. The self-paced tempo was not individualized relative to the metronome tempo, so the two conditions may not have been matched for speed. Twenty repetitions may not have produced enough fatigue to test fatigue effects. The study measured laboratory force and sway variables, not patient outcomes, treatment effects, or follow-up.
Declared interests
The authors declared no conflict of interest with any financial organization.
The easy way to misread this
Do not use these findings to conclude that metronome pacing improves clinical symmetry or that the preferred leg is stronger. The study measured a short lab task in 18 healthy active adults and did not test injured patients, rehabilitation outcomes, or strength.