Development and Validation of a Leg Press Force Measuring Device to Assess Limb Strength Asymmetry

Abstract

Purpose: To develop and validate a low-cost modular instrument that interfaces with a leg press device to measure limb strength asymmetry. Methods: Fifteen participants completed double-limb leg presses at several weights on a leg press device that was fitted with modular force measuring devices. Asymmetry ratios were calculated for the limbs during concentric, transition, and eccentric phases and compared across phases and weights. Results: Participants demonstrated more symmetrical leg press patterns during higher loads compared to lower loads, particularly during the concentric phase. Conclusions: As weight increases toward a one-repetition maximum, participants would be expected to demonstrate more symmetrical patterns. This preliminary assessment indicates this device may be valid to assess limb asymmetries in patients. [Athletic Training & Sports Health Care. 2021;13(4):e153–e158.]