Grip Force and Subjective Hand Force Exertions under Handedness and Postural Conditions for Male Teenagers

Abstract

An experiment was conducted to measure the grip force of teenaged male subjects at pre-determined exertion levels on the CR-10 scale under four hand-posture conditions. A test collecting the subjective rating of hand exertion when applying a grip force of 10 kgf was also conducted. Strong correlation between the CR-10 ratings and the grip forces was found. The subjects applied grip forces higher than their predicted grip force values. Four regression models were established to describe the relationship between the subjective rating and hand force. These models were significant with R^2 of 0.93 or higher. Reverse predictions of grip force were conducted using the subjecting rating as the independent variable. The predicting error was in the range from 0.04 to 4.39 kgf with a mean absolute deviation of 1.49 kgf.