A preliminary analysis of the validity of gravity correction procedures applied in trunk dynamometry

Abstract

The validity of gravity correction procedures was examined using a KinCom trunk testing dynamometer. Gravity correction measures were expressed as a percentage of the anthropometric estimate of head, arms and trunk weight at 25° of trunk flexion and extension. Polynomial regression was used to describe gravity correction scores across range and compared to cosine curves generated by the supplier's gravity correction software (GCS) at 25°. The GCS method least reflected the percentage body weight estimate although none of the gravity correction methods closely matched the anthropometric estimate. Eccentric passive force curves and isometric curves were highest in both trunk flexion and trunk ..