Selective deficits of grip force control during object manipulation in patients with reduced sensibility of the grasping digits

2003 ◽  
Vol 47 (1) ◽  
pp. 65-72 ◽  
Author(s):  
Dennis A. Nowak ◽  
Joachim Hermsdörfer
Keyword(s):  
Force Control ◽  
Grip Force ◽  
Object Manipulation ◽  
Grip Force Control

Anticipatory and Reactive Grip Force Control in Patients with Alzheimer’s Disease: A Pilot Study

2021 ◽  
pp. 1-15
Author(s):  
Anna Gabriel ◽  
Carolin T. Lehner ◽  
Chiara Höhler ◽  
Thomas Schneider ◽  
Tessa P.T. Pfeiffer ◽  
...  
Keyword(s):  
Alzheimer’S Disease ◽  
Alzheimer's Disease ◽  
Pilot Study ◽  
Force Control ◽  
Grip Force ◽  
Object Manipulation ◽  
Step Test ◽  
Grip Force Control ◽  
Potential Biomarker ◽  
Neurological Conditions

Background: Alzheimer’s disease (AD) affects several cognitive functions and causes altered motor function. Fine motor deficits during object manipulation are evident in other neurological conditions, but have not been assessed in dementia patients yet. Objective: Investigate reactive and anticipatory grip force control in response to unexpected and expected load force perturbation in AD. Methods: Reactive and anticipatory grip force was investigated using a grip-device with force sensors. In this pilot study, fifteen AD patients and fourteen healthy controls performed a catching task. They held the device with one hand while a sandbag was dropped into an attached receptacle either by the experimenter or by the participant. Results: In contrast to studies of other neurological conditions, the majority of AD patients exerted lower static grip force levels than controls. Interestingly, patients who were slow in the Luria’s three-step test produced normal grip forces. The timing and magnitude of reactive grip force control were largely preserved in patients. In contrast, timing and extent of anticipatory grip forces were impaired in patients, although anticipatory control was generally preserved. These deficits were correlated with decreasing Mini-Mental State Examination scores. Apraxia scores, assessed by pantomime of tool-use, did not correlate with performance in the catching task. Conclusion: We interpreted the decreased grip force in AD in the context of loss of strength and lethargy, typical for patients with AD. The lower static grip force during object manipulation may emerge as a potential biomarker for early stages of AD, but more studies with larger sample sizes are necessary.

Deficits of predictive grip force control during object manipulation in acute stroke

2003 ◽  
Vol 250 (7) ◽  
pp. 850-860 ◽  
Author(s):  
Dennis A. Nowak ◽  
Joachim Hermsd�rfer ◽  
Helge Topka
Keyword(s):  
Acute Stroke ◽  
Force Control ◽  
Grip Force ◽  
Object Manipulation ◽  
Grip Force Control

Grip force anticipation of nonlinear, underactuated load force

2021 ◽  
Author(s):  
Francis M. Grover ◽  
Christopher Riehm ◽  
Paula L. Silva ◽  
Tamara Lorenz ◽  
Michael A. Riley
Keyword(s):  
Force Control ◽  
Internal Model ◽  
Grip Force ◽  
Object Manipulation ◽  
Load Force ◽  
Complex Object ◽  
Active Object ◽  
Grip Force Control ◽  
Motor Commands ◽  
Model Approach

Feedforward internal model-based control enabled by efference copies of motor commands is the prevailing theoretical account of motor anticipation. Grip force control during object manipulation-a paradigmatic example of motor anticipation-is a key line of evidence for that account. However, the internal model approach has not addressed the computational challenges faced by the act of manipulating mechanically complex objects with nonlinear, underactuated degrees of freedom. These objects exhibit complex and unpredictable load force dynamics which cannot be encoded by efference copies of underlying motor commands, leading to the prediction from the perspective of an efference copy-enabled feedforward control scheme that grip force should either lag or fail to coordinate with changes in load force. In contrast to that prediction, we found evidence for strong, precise, anticipatory grip force control during manipulations of a complex object. The results are therefore inconsistent with the internal forward model approach and suggest that efference copies of motor commands are not necessary to enable anticipatory control during active object manipulation.

scholarly journals Proximal arm kinematics affect grip force-load force coordination

2015 ◽  
Vol 114 (4) ◽  
pp. 2265-2277 ◽  
Author(s):  
Billy C. Vermillion ◽  
Peter S. Lum ◽  
Sang Wook Lee
Keyword(s):  
Force Control ◽  
Muscle Activation ◽  
Grip Force ◽  
Object Manipulation ◽  
Load Force ◽  
Hand Muscles ◽  
Grip Force Control ◽  
Arm Kinematics ◽  
Force Ratio ◽  
The Impact

During object manipulation, grip force is coordinated with load force, which is primarily determined by object kinematics. Proximal arm kinematics may affect grip force control, as proximal segment motion could affect control of distal hand muscles via biomechanical and/or neural pathways. The aim of this study was to investigate the impact of proximal kinematics on grip force modulation during object manipulation. Fifteen subjects performed three vertical lifting tasks that involved distinct proximal kinematics (elbow/shoulder), but resulted in similar end-point (hand) trajectories. While temporal coordination of grip and load forces remained similar across the tasks, proximal kinematics significantly affected the grip force-to-load force ratio ( P = 0.042), intrinsic finger muscle activation ( P = 0.045), and flexor-extensor ratio ( P < 0.001). Biomechanical coupling between extrinsic hand muscles and the elbow joint cannot fully explain the observed changes, as task-related changes in intrinsic hand muscle activation were greater than in extrinsic hand muscles. Rather, between-task variation in grip force (highest during task 3) appears to contrast to that in shoulder joint velocity/acceleration (lowest during task 3). These results suggest that complex neural coupling between the distal and proximal upper extremity musculature may affect grip force control during movements, also indicated by task-related changes in intermuscular coherence of muscle pairs, including intrinsic finger muscles. Furthermore, examination of the fingertip force showed that the human motor system may attempt to reduce variability in task-relevant motor output (grip force-to-load force ratio), while allowing larger fluctuations in output less relevant to task goal (shear force-to-grip force ratio).

scholarly journals Superposition of Automatic and Voluntary Aspects of Grip Force Control in Humans during Object Manipulation

PLoS ONE ◽  
2013 ◽  
Vol 8 (11) ◽  
pp. e79341 ◽  
Author(s):  
Frederic Danion
Keyword(s):  
Force Control ◽  
Grip Force ◽  
Object Manipulation ◽  
Grip Force Control

Grip force control during object manipulation in cerebral stroke

2003 ◽  
Vol 114 (5) ◽  
pp. 915-929 ◽  
Author(s):  
J Hermsdörfer ◽  
E Hagl ◽  
D.A Nowak ◽  
C Marquardt
Keyword(s):  
Force Control ◽  
Grip Force ◽  
Object Manipulation ◽  
Cerebral Stroke ◽  
Grip Force Control

Effect of Fatigue on Grip Force Control during Object Manipulation in Carpal Tunnel Syndrome

Motor Control ◽  
2012 ◽  
Vol 16 (4) ◽  
pp. 521-536 ◽  
Author(s):  
Daniela JS Mattos ◽  
Susana Cristina Domenech ◽  
Noé Gomes Borges Junior ◽  
Marcio José Santos
Keyword(s):  
Carpal Tunnel Syndrome ◽  
Carpal Tunnel ◽  
Force Control ◽  
Grip Force ◽  
Object Manipulation ◽  
Grip Force Control ◽  
Tunnel Syndrome

scholarly journals Grip force control during object manipulation in cervical myelopathy

Spinal Cord ◽  
2020 ◽  
Vol 58 (6) ◽  
pp. 689-694
Author(s):  
Naoto Noguchi ◽  
Bumsuk Lee ◽  
Shoya Kamiya ◽  
Ken Kondo ◽  
Ryoto Teshima ◽  
...  
Keyword(s):  
Force Control ◽  
Cervical Myelopathy ◽  
Grip Force ◽  
Object Manipulation ◽  
Grip Force Control
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