scholarly journals Cerebello-Cortical Differences in Effective Connectivity of the Dominant and Non-dominant Hand during a Visuomotor Paradigm of Grip Force Control

2017 ◽  
Vol 11 ◽  
Author(s):  
Eric Moulton ◽  
Cécile Galléa ◽  
Claire Kemlin ◽  
Romain Valabregue ◽  
Marc A. Maier ◽  
...  
Keyword(s):  
Force Control ◽  
Grip Force ◽  
Effective Connectivity ◽  
Dominant Hand ◽  
Grip Force Control

scholarly journals Neural Correlates of Age-Related Changes in Precise Grip Force Regulation: A Combined EEG-fNIRS Study

2020 ◽  
Vol 12 ◽  
Author(s):  
Alisa Berger ◽  
Fabian Steinberg ◽  
Fabian Thomas ◽  
Michael Doppelmayr
Keyword(s):  
Older Adults ◽  
Motor Control ◽  
Force Control ◽  
Grip Force ◽  
Task Complexity ◽  
Brain Activity ◽  
Dominant Hand ◽  
Grip Force Control ◽  
Age Related ◽  
Age Related Changes

Motor control is associated with suppression of oscillatory activity in alpha (8–12 Hz) and beta (12–30 Hz) ranges and elevation of oxygenated hemoglobin levels in motor-cortical areas. Aging leads to changes in oscillatory and hemodynamic brain activity and impairments in motor control. However, the relationship between age-related changes in motor control and brain activity is not yet fully understood. Therefore, this study aimed to investigate age-related and task-complexity-related changes in grip force control and the underlying oscillatory and hemodynamic activity. Sixteen younger [age (mean ± SD) = 25.4 ± 1.9, 20–30 years] and 16 older (age = 56.7 ± 4.7, 50–70 years) healthy men were asked to use a power grip to perform six trials each of easy and complex force tracking tasks (FTTs) with their right dominant hand in a randomized within-subject design. Grip force control was assessed using a sensor-based device. Brain activity in premotor and primary motor areas of both hemispheres was assessed by electroencephalography (EEG) and functional near-infrared spectroscopy (fNIRS). Older adults showed significantly higher inaccuracies and higher hemodynamic activity in both FTTs than did young adults. Correlations between grip force control owing to task complexity and beta activity were different in the contralateral premotor cortex (PMC) between younger and older adults. Collectively, these findings suggest that aging leads to impairment of grip force control and an increase in hemodynamic activity independent of task complexity. EEG beta oscillations may represent a task-specific neurophysiological marker for age-related decline in complex grip force control and its underlying compensation strategies. Further EEG-fNIRS studies are necessary to determine neurophysiological markers of dysfunctions underlying age-related motor disabilities for the improvement of individual diagnosis and therapeutic approaches.

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

Variable and intermittent grip force control in response to differing load force dynamics

2018 ◽  
Vol 237 (3) ◽  
pp. 687-703 ◽  
Author(s):  
Francis M. Grover ◽  
Patrick Nalepka ◽  
Paula L. Silva ◽  
Tamara Lorenz ◽  
Michael A. Riley
Keyword(s):  
Force Control ◽  
Grip Force ◽  
Load Force ◽  
Force Dynamics ◽  
Grip Force Control

Preserved and impaired aspects of predictive grip force control in cerebellar patients

2005 ◽  
Vol 116 (6) ◽  
pp. 1405-1414 ◽  
Author(s):  
Katrin Rost ◽  
Dennis A. Nowak ◽  
Dagmar Timmann ◽  
Joachim Hermsdörfer
Keyword(s):  
Force Control ◽  
Grip Force ◽  
Grip Force Control

Effects of rTMS on grip force control following subcortical stroke

2008 ◽  
Vol 211 (2) ◽  
pp. 407-412 ◽  
Author(s):  
Manuel Dafotakis ◽  
Christian Grefkes ◽  
Simon B. Eickhoff ◽  
Hans Karbe ◽  
Gereon R. Fink ◽  
...  
Keyword(s):  
Force Control ◽  
Grip Force ◽  
Grip Force Control

scholarly journals Effect of Feedback during Virtual Training of Grip Force Control with a Myoelectric Prosthesis

PLoS ONE ◽  
2014 ◽  
Vol 9 (5) ◽  
pp. e98301 ◽  
Author(s):  
Hanneke Bouwsema ◽  
Corry K. van der Sluis ◽  
Raoul M. Bongers
Keyword(s):  
Force Control ◽  
Grip Force ◽  
Virtual Training ◽  
Myoelectric Prosthesis ◽  
Grip Force Control
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