Efficacies of ultrasound and a handheld dynamometer to predict one-repetition maximum.
Masatoshi Nakamura, Shigeki Sutoh, Ryosuke Kiyono and 4 others
PMID 31645808WHAT IT FOUND
Knee-extension 1RM in healthy young adults could be predicted from body mass, sex, and ultrasound muscle thickness.
A formula that also used handheld dynamometer strength produced predicted values that were not different from measured values. The formulas were not tested in older or clinical patients.
Key findings
01A formula using body mass, gender, and muscle thickness at 15 cm above the patella predicted 1RM without a significant difference from measured 1RM.
02A formula that also included MVIC predicted 1RM without a significant difference from measured 1RM.
03The predicted mean 1RM values were 34.1 ± 11.7 kg and 34.0 ± 12.0 kg.
STILL TO COME
How it was doneWhat they foundWhat it means for PTs
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What it does not show
The formulas were developed in healthy young adults only, so it is unclear whether they work for older adults or clinical populations. The paper did not test the prediction method against actual resistance training outcomes. The study addressed only knee-extension 1RM, not other muscle groups. The paper says further studies are needed to test the method in elderly or clinical populations and to investigate its efficiency for prescribing resistance training.
Declared interests
None declared.
The easy way to misread this
Do not apply these formulas to older or clinical patients. They were derived from 64 healthy adults, with mean ages 21.4 years for men and 20.7 years for women, and the paper states that validity in elderly or clinical populations is unclear.