Finger Forces and Predictability using various Hand Couplings

Abstract

Hand and finger force data are used in many settings, including industrial design and indicating progress during rehabilitation. Available data in the literature has primarily focused on whole-hand or multi-digit pinch exertions. The present study compiled and examined forces exerted by the fingers in a variety of couplings to both enhance and supplement available data. Forces were measured using strain gauge force transducers, and a modification of standard protocols was followed to obtain consistent and applicable data. Correlations within and among maximum finger forces, whole-hand grip force, and anthropometric measures were examined. Multiple regression models were developed to determine predictability of strength in various finger couplings from more accessible measures. Together with past data, this strength data should be helpful when designing effective and efficient human-machine interfaces involving finger intensive tasks. Results indicated that hand and finger strength cannot be accurately predicted from simple grip strength and anthropometric measures.