Use of force-velocity relationship to estimate the one-repetition maximum leg press exercise among young females.
Yasushi Kurobe, Kimito Momose
PMID 36866008WHAT IT FOUND
For young untrained women, a quick two-load leg press test estimates their one-rep max with moderate accuracy.
The formula is specific to this group, so do not use it for men, older adults, or trained athletes.
Key findings
01The force at zero velocity (F0) showed a very high correlation with the measured one-repetition maximum (1RM) in young untrained females.
02The estimation equation had a standard error of the estimate of 12.5 kg, which the authors described as moderate accuracy.
03The reliability of the force measurements used to build the equation was excellent, with intraclass correlation coefficients between 0.99 and 1.00.
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 ten young, untrained females, so the equation cannot be applied to men, older adults, or trained athletes. The estimation accuracy is moderate, with a standard error of 12.5 kg, which represents a significant margin of error for strength prescription. The method was tested only on a specific horizontal leg press machine, and results may not transfer to other equipment or free-weight exercises.
Declared interests
No funding was received for this study.
The easy way to misread this
Do not use the equation estimated 1RM = 0.08 × F0 – 3.00 for male patients, older adults, or trained individuals. It was derived solely from ten young untrained females and is not valid for other populations.