Prediction of 10 Repetition Maximum for Short-Arc Quadriceps Exercise From Hand-Held Dynamometer and Anthropometric Measurements

Matthew K. Walsworth, Raquel Schneider, Jon Schultz, Corey Dahl, Stephen C. Allison, Frank B. Underwood, Jane Freund

Short-arc quadriceps exercises are commonly prescribed in physical therapy for strengthening knee extensor musculature. Determining the appropriate starting resistance has traditionally been a trial-and-error procedure. Therefore, developing an expedient method of estimating the correct starting resistance may lead to a more accurate exercise prescription. The primary purpose of this study was to establish a technique for predicting an individual's 10 repetition maximum (10 RM) based on hand-held dynamometer (HHD) strength recording and additional anthropometric predictor variables. Fifty healthy subjects (31 males and 19 females), aged 22-53 years, participated in the study. A prediction equation for determining 10 RM using HHD strength recording, weight, gender, and age was developed. By implementing this equation, clinicians can predict a normal, healthy, young to middle-aged adult's 10 RM within 2 ± 4.17 kg with a 95% confidence level (SEE = 2.13 kg).

J Orthop Sports Phys Ther. 1998;28(2):97-104.

Key Words: knee, muscle strength, prediction

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