Affiliations: [a] Widener University, Chester, PA, USA
Note: [] Corresponding author: Dawn T. Gulick, Widener University,
Institute for Physical Therapy Education, 112 Cottee Hall, One University
Place, Chester, PA 19013, USA. Tel.: +1 610 499-1287; Fax: +1 610 499-1231;
E-mail: Dawn.T.Gulick@Widener.edu
Abstract: The purpose of this study was twofold: determine which isokinetic
determinants correlated best with an isotonic one-repetition maximum (1-RM) and
to generate, based on these determinants a formula that will allow clinicians
to utilize isokinetic testing to predict an isotonic 1-RM. Fifty female
subjects, ranging from 18-35 years of age, participated in this study. Strength
measurements using a Cybex II isokinetic dynamometer (peak torque, average peak
torque, peak torque:body weight, work per repetition, and total work) and a
Cybex isotonic knee extension machine were performed. The subject's height and
body weight were recorded. Through linear regression analysis the variables
peak torque and body weight were determined to be the best predictors of an
isotonic 1-RM. These variables were incorporated in the following formula:
Predicted 1-RM = 21.38 + (0.24 x Peak Torque) + (0.18 x Body Weight) which may
used utilized by clinicians to predict an isotonic 1-RM.
