Finger force sharing during an adapted power grip task

2011 ◽  
Vol 504 (3) ◽  
pp. 290-294 ◽  
Author(s):  
Laurent Vigouroux ◽  
Jérémy Rossi ◽  
Matthieu Foissac ◽  
Laurent Grélot ◽  
Eric Berton
Keyword(s):  
Finger Force ◽  
Power Grip ◽  
Force Sharing

scholarly journals Preliminary findings of finger independency and visual force control in children with DCD

2015 ◽  
Vol 9 (2) ◽  
Author(s):  
Marcio Alves de Oliveira
Keyword(s):  
Force Control ◽  
Degrees Of Freedom ◽  
Motor Task ◽  
Force Production ◽  
Typically Developing ◽  
Finger Force ◽  
Force Sharing ◽  
Finger Forces ◽  
Sharing Patterns ◽  
Maximum Voluntary Force

<p>Finger independency and visual force control were studied in children with DCD. Five children, 9 to10 years of age, diagnosed with DCD and five age-matched typically developing children were asked to perform two isometric tasks, maximum voluntary force production (MVF) and visual force control (VFC), in seven different finger conditions [Index (I), Middle (M), Ring (R), Little (L) IM, IMR, and IMRL]. For the VFC tasks, the participants were asked to continuously control their finger forces at 20% of the MVF. To examine finger force independency, maximum voluntary force (MVF), force enslaving (FE) and force sharing (FS) values were computed. To analyze the ability of children with DCD to visually control their finger forces, the following performance measures were calculated: rate of force change, initial overshoot, coefficient of variation (CV), root mean square error (RMSe), and inter-trial variability. The results from the MVF task showed that children with DCD as compared with TD children (a) produced similar levels of maximum finger force; (b) demonstrated less finger independency; (c) had similar finger-force sharing patterns. In addition, from the VFC task we found (d) larger performance errors in children with DCD; (e) and lower inter-trial consistency as compared to their TD peers. Our preliminary findings suggest that the impairments in manipulative skills often observed in children with DCD during everyday activities may be related to deficits in finger independency. Additionally we found that children with DCD do not have difficulties in reducing the number of joint/muscle-level degrees of freedom in order to achieve a common motor task.</p>

scholarly journals Preliminary findings of finger independency and visual force control in children with DCD

2015 ◽  
Vol 9 (2) ◽  
Author(s):  
Marcio Alves de Oliveira
Keyword(s):  
Performance Measures ◽  
Force Control ◽  
Degrees Of Freedom ◽  
Motor Task ◽  
Finger Force ◽  
Everyday Activities ◽  
Force Sharing ◽  
Finger Forces ◽  
Sharing Patterns ◽  
Maximum Voluntary Force

To examine finger force independency, maximum voluntary force (MVF), force enslaving (FE) and force sharing (FS) values were computed. To analyze the ability of children with DCD to visually control their finger forces, the following performance measures were calculated: rate of force change, initial overshoot, coefficient of variation (CV), root mean square error (RMSe), and inter-trial variability. The results from the MVF task showed that children with DCD as compared with TD children (a) produced similar levels of maximum finger force; (b) demonstrated less finger independency;(c) had similar finger-force sharing patterns. In addition, from the VFC task we found (d) larger performance errors in children with DCD;(e) and lower inter-trial consistency as compared to their TD peers.Our preliminary findings suggest that the impairments in manipulative skills often observed in children with DCD during everyday activities may be related to deficits in finger independency.Additionally we found that children with DCD do not have difficulties in reducing the number of joint/muscle-level degrees of freedom in order to achieve a common motor task.

scholarly journals Behavioral effects of continuous theta-burst stimulation in macaque parietal cortex

2021 ◽  
Vol 11 (1) ◽  
Author(s):  
Lara Merken ◽  
Marco Davare ◽  
Peter Janssen ◽  
Maria C. Romero
Keyword(s):  
Parietal Cortex ◽  
High Intensity ◽  
Theta Burst Stimulation ◽  
Burst Stimulation ◽  
Primate Model ◽  
Power Grip ◽  
Fitts Law ◽  
Behavioral Evidence ◽  
Theta Burst ◽  
Continuous Theta Burst Stimulation

AbstractThe neural mechanisms underlying the effects of continuous Theta-Burst Stimulation (cTBS) in humans are poorly understood. Animal studies can clarify the effects of cTBS on individual neurons, but behavioral evidence is necessary to demonstrate the validity of the animal model. We investigated the behavioral effect of cTBS applied over parietal cortex in rhesus monkeys performing a visually-guided grasping task with two differently sized objects, which required either a power grip or a pad-to-side grip. We used Fitts’ law, predicting shorter grasping times (GT) for large compared to small objects, to investigate cTBS effects on two different grip types. cTBS induced long-lasting object-specific and dose-dependent changes in GT that remained present for up to two hours. High-intensity cTBS increased GTs for a power grip, but shortened GTs for a pad-to-side grip. Thus, high-intensity stimulation strongly reduced the natural GT difference between objects (i.e. the Fitts’ law effect). In contrast, low-intensity cTBS induced the opposite effects on GT. Modifying the coil orientation from the standard 45-degree to a 30-degree angle induced opposite cTBS effects on GT. These findings represent behavioral evidence for the validity of the nonhuman primate model to study the neural underpinnings of non-invasive brain stimulation.

scholarly journals Recovery and Fatigue Behavior of Forearm Muscles during a Repetitive Power Grip Gesture in Racing Motorcycle Riders

2021 ◽  
Vol 18 (15) ◽  
pp. 7926
Author(s):  
Michel Marina ◽  
Priscila Torrado ◽  
Raul Bescós
Keyword(s):  
Duty Cycle ◽  
Fatigue Behavior ◽  
Median Frequency ◽  
Flexor Digitorum Superficialis ◽  
Muscle Training ◽  
Maximal Voluntary Isometric Contraction ◽  
Power Grip ◽  
Road Racing ◽  
Flexor Digitorum ◽  
Forearm Muscle

Despite a reduction in the maximal voluntary isometric contraction (MVCisom) observed systematically in intermittent fatigue protocols (IFP), decrements of the median frequency, assessed by surface electromyography (sEMG), has not been consistently verified. This study aimed to determine whether recovery periods of 60 s were too long to induce a reduction in the normalized median frequency (MFEMG) of the flexor digitorum superficialis and carpi radialis muscles. Twenty-one road racing motorcycle riders performed an IFP that simulated the posture and braking gesture on a motorcycle. The MVCisom was reduced by 53% (p < 0.001). A positive and significant relationship (p < 0.005) was found between MFEMG and duration of the fatiguing task when 5 s contractions at 30% MVCisom were interspersed by 5 s recovery in both muscles. In contrast, no relationship was found (p > 0.133) when 10 s contractions at 50% MVC were interspersed by 1 min recovery. Comparative analysis of variance (ANOVA) confirmed a decrement of MFEMG in the IFP at 30% MVCisom including short recovery periods with a duty cycle of 100% (5 s/5 s = 1), whereas no differences were observed in the IFP at 50% MVCisom and longer recovery periods, with a duty cycle of 16%. These findings show that recovery periods during IFP are more relevant than the intensity of MVCisom. Thus, we recommend the use of short recovery periods between 5 and 10 s after submaximal muscle contractions for specific forearm muscle training and testing purposes in motorcycle riders.

scholarly journals Aging differentially affects online control and offline control in finger force production

PLoS ONE ◽  
2018 ◽  
Vol 13 (5) ◽  
pp. e0198084
Author(s):  
Yang Sun Park ◽  
Kyung Koh ◽  
Hyun Joon Kwon ◽  
Okjin Lee ◽  
Jae Kun Shim
Keyword(s):  
Force Production ◽  
Online Control ◽  
Finger Force

The beneficial effects of subthalamic nucleus stimulation on manipulative finger force control in Parkinson's disease

2005 ◽  
Vol 193 (2) ◽  
pp. 427-436 ◽  
Author(s):  
Dennis A. Nowak ◽  
Helge Topka ◽  
Stephen Tisch ◽  
Marwan Hariz ◽  
Patricia Limousin ◽  
...  
Keyword(s):  
Parkinson’S Disease ◽  
Parkinson's Disease ◽  
Subthalamic Nucleus ◽  
Force Control ◽  
Finger Force ◽  
Beneficial Effects ◽  
Subthalamic Nucleus Stimulation

The effects of stroke and age on finger interaction in multi-finger force production tasks

2003 ◽  
Vol 114 (9) ◽  
pp. 1646-1655 ◽  
Author(s):  
Sheng Li ◽  
Mark L Latash ◽  
Guang H Yue ◽  
Vlodek Siemionow ◽  
Vinod Sahgal
Keyword(s):  
Force Production ◽  
Finger Force
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