BACKGROUND The purpose of this study was to investigate the lifting characteristics of elders with functional limitations using burden lifting smoothness, trunk angular momentum, and back and hip torque, and to correlate these characteristics with strength and functional measures. METHODS Thirty elders (65-89 years old) consented to biomechanical analysis of lifting, gait, and chair rise, and...

The purpose of this paper is to study some jerk motions considering some dynamic cases, other than the classical ones and extending the setting. We consider a special set of variations, finding a set of jerk motions, generalizing some cases known only in some particular forms till now. Finally we give a simple mechanical interpretation of these ideas. The subject is topical because we model a l...

Many measures have been employed to quantify an aspect of healthy, skilled movement, which has been termed “movement smoothness” of which jerk is the most common. We propose a new, biologicallymotivated quantification of “movement smoothness”: submovement overlap. In previous work, changes in submovements have been linked to changes in movement smoothness. Further investigation revealed that in...

The method proposed here produces trajectories of articulatory movements based on a kinematic triphone model and the mimimum-jerk model. The kinematic triphone model, which is constructed from articulatory data obtained in the experiments through the use of a magnetic sensor system, is characterized by three kinematic features for a triphone and intervals between two successive phonemes in the ...