Temporal postural synergies of the hand in rapid grasping tasks.
Postural synergies of the hand have been widely proposed in the literature, but only a few attempts were made to visualize temporal postural synergies, i.e., profiles of postural synergies varying over time. This paper aims to derive temporal postural synergies from kinematic synergies extracted from joint angular velocity profiles of rapid grasping movements. The rapid movements constrain the kinematic synergies to combine instantaneously, and thus, the movements can be approximated by a weighted summation of synchronous synergies. After being extracted by using singular value decomposition, the synchronous kinematic synergies were translated into temporal postural synergies, which revealed strategies of enslaving, metacarpal flexion for larger movements, and hierarchical recruitment of joints, adapted by subjects while grasping.
Vinjamuri
Ramana
R
Department of Physical Medicine and Rehabilitation, University of Pittsburgh, Pittsburgh, PA 15213, USA. rkv3@pitt.edu
Sun
Mingui
M
Chang
Cheng-Chun
CC
Lee
Heung-No
HN
Sclabassi
Robert J
RJ
Mao
Zhi-Hong
ZH
D001696:Biomechanical Phenomena; D006225:Hand / Q000502:physiology*; D018737:Hand Strength; D006801:Humans; D011187:Posture