Abstract
The tight coupling between load (L) and grip (G) forces during voluntary manipulation of a hand-held object is well established. The current study is to examine grip-load force coupling when motion of the hand with an object was either self-generated (voluntary) or externally generated. Subjects performed similar cyclic movements of different loads at various frequencies with three types of manipulations: 1) voluntary oscillation, 2) oscillating the right arm via the pulley system by the left leg (self-driven oscillation), and 3) oscillating the arm via the pulley system by another person (other-driven oscillation). During the self-generated movements: 1) the grip forces were larger and 2) grip-load force modulation was more pronounced than in the externally generated movements. The G-L adjustments are not completely determined by the mechanics of object motion; nonmechanical factors related to movement performance, for instance perceptual factors, may affect the G-L coupling.
| Original language | English |
|---|---|
| Pages (from-to) | 300-308 |
| Number of pages | 9 |
| Journal | Journal of Hand Therapy |
| Volume | 20 |
| Issue number | 4 |
| DOIs | |
| State | Published - Oct 2007 |
Bibliographical note
Funding Information:This work was supported in part by grants AR-048563, AG-018751, and NS 35032 from the National Institutes of Health, USA.
ASJC Scopus subject areas
- Physical Therapy, Sports Therapy and Rehabilitation
- Rehabilitation