Ability of Isokinetic Dynamometer to Predict 1 Repetition Maximum Isotonic Knee Extension

Context:Resistance training exercise prescription is often based on exercises performed at a percentage of a 1 repetition maximum (1 RM). Following knee injury, there is no consensus when a patient can safely perform 1 RM testing. Resistance training programs require the use of higher loads and loads used in knee injury rehabilitation may be too low to elicit gains in strength and power. A maximum isometric contraction can safely be performed during early stages of knee rehabilitation and has potential to predict an isotonic knee extension 1 RM.Objectives:To determine whether a 1 repetition maximum (1 RM) on an isotonic knee extension machine can be predicted from isometric peak torque measurements.Design:Descriptive laboratory study.Setting:University research laboratory.Participants:12 male and 8 female healthy physically active adults.Main Outcome Measures:An isokinetic dynamometer was used to determine isometric peak torque (Nm). 1 RM testing was performed on a knee extension machine. Linear regressio...