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Fabien Buisseret - One of the best experts on this subject based on the ideXlab platform.
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fine adaptive precision Grip Control without maximum pinch strength changes after upper limb neurodynamic mobilization
Scientific Reports, 2021Co-Authors: Frédéric Dierick, Jean-michel Brismée, Olivier White, Anne-france Bouché, Céline Périchon, Nastasia Filoni, Vincent Barvaux, Fabien BuisseretAbstract:Before and immediately after passive upper limb neurodynamic mobilizations targeting the median nerve, Grip ([Formula: see text]) and load ([Formula: see text]) forces applied by the thumb, index and major fingers (three-jaw chuck pinch) were collected using a manipulandum during three different Grip precision tasks: Grip-lift-hold-replace (GLHR), vertical oscillations (OSC), and vertical oscillations with up and down collisions (OSC/COLL/u, OSC/COLL/d). Several parameters were collected or computed from [Formula: see text] and [Formula: see text]. Maximum pinch strength and fingertips pressure sensation threshold were also examined. After the mobilizations, [Formula: see text] max changes from 3.2 ± 0.4 to 3.4 ± 0.4 N (p = 0.014), d[Formula: see text] from 89.0 ± 66.6 to 102.2 ± 59.6 [Formula: see text] (p = 0.009), and d[Formula: see text] from 43.6 ± 17.0 to 56.0 ± 17.9 [Formula: see text] ([Formula: see text]0.001) during GLHR. [Formula: see text] SD changes from 0.9 ± 0.3 to 1.0 ± 0.2 N (p = 0.004) during OSC. [Formula: see text] peak changes from 17.4 ± 8.3 to 15.1 ± 7.5 N ([Formula: see text]0.001), [Formula: see text] from 12.4 ± 6.7 to 11.3 ± 6.8 N (p = 0.033), and [Formula: see text] from 2.9 ± 0.4 to 3.00 ± 0.4 N (p = 0.018) during OSC/COLL/u. [Formula: see text] peak changes from 13.5 ± 7.4 to 12.3 ± 7.7 N (p = 0.030) and [Formula: see text] from 14.5 ± 6.0 to 13.6 ± 5.5 N (p = 0.018) during OSC/COLL/d. Sensation thresholds at index and thumb were reduced (p = 0.001, p = 0.008). Precision Grip adaptations observed after the mobilizations could be partly explained by changes in cutaneous median-nerve pressure afferents from the thumb and index fingertips.
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Fine adaptive precision Grip Control without maximum pinch strength changes after upper limb neurodynamic mobilization
'Springer Science and Business Media LLC', 2021Co-Authors: Frédéric Dierick, Jean-michel Brismée, Olivier White, Anne-france Bouché, Céline Périchon, Nastasia Filoni, Vincent Barvaux, Fabien BuisseretAbstract:Abstract Before and immediately after passive upper limb neurodynamic mobilizations targeting the median nerve, Grip ( $$G_F$$ G F ) and load ( $$L_F$$ L F ) forces applied by the thumb, index and major fingers (three-jaw chuck pinch) were collected using a manipulandum during three different Grip precision tasks: Grip-lift-hold-replace (GLHR), vertical oscillations (OSC), and vertical oscillations with up and down collisions (OSC/COLL/u, OSC/COLL/d). Several parameters were collected or computed from $$G_F$$ G F and $$L_F$$ L F . Maximum pinch strength and fingertips pressure sensation threshold were also examined. After the mobilizations, $$L_F$$ L F max changes from 3.2 ± 0.4 to 3.4 ± 0.4 N (p = 0.014), d $$G_F$$ G F from 89.0 ± 66.6 to 102.2 ± 59.6 $$N~\text{s}^{-1}$$ N s - 1 (p = 0.009), and d $$L_F$$ L F from 43.6 ± 17.0 to 56.0 ± 17.9 $$N~\text{s}^{-1}$$ N s - 1 ( $$p
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Fine adaptive Control of precision Grip without maximum pinch strength changes after median nerve mobilization
2020Co-Authors: Frédéric Dierick, Jean-michel Brismée, Olivier White, Anne-france Bouché, Céline Périchon, Nastasia Filoni, Vincent Barvaux, Fabien BuisseretAbstract:ABSTRACT Fine dexterity critically depends on information conveyed by the median nerve. While the effects of its compression and vibration are well characterized, little is known about longitudinal tension and excursion. Using a force-sensitive manipulandum, a numeric dynamometer and Semmes-Weinstein monofilaments, we examined the adaptations of precision Grip Control, maximum pinch strength and fingertips pressure sensation threshold before and immediately after the application of longitudinal tension and excursion mobilizations applied on the median nerve. Grip (GF) and load (LF) forces applied by the thumb, index and major fingers were collected in 40 healthy young participants during three different Grip precision tasks along the direction of gravity. For Grip-lift-drop task, maximum GF and LF and their first time derivatives were computed. For up-down oscillations, means of GF and LF and their variability were computed. For oscillations with up and down collisions, peaks of GF and LF, time delay between GF peak and contact, and values of GF and LF at contact were collected. Our findings show that median nerve mobilizations induce significant fine adaptations of precision Grip Control in the three different tasks but mainly during Grip-lift-drop and oscillations with collisions. Fingertips pressure sensation thresholds at index and thumb were significantly reduced after the mobilizations. No significant changes were observed for maximum pinch strength. We conclude that precision Grip adaptations observed after median mobilizations could be partly explained by changes in cutaneous median-nerve mechanoreceptive afferents from the thumb and index fingertips.
Olivier White - One of the best experts on this subject based on the ideXlab platform.
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fine adaptive precision Grip Control without maximum pinch strength changes after upper limb neurodynamic mobilization
Scientific Reports, 2021Co-Authors: Frédéric Dierick, Jean-michel Brismée, Olivier White, Anne-france Bouché, Céline Périchon, Nastasia Filoni, Vincent Barvaux, Fabien BuisseretAbstract:Before and immediately after passive upper limb neurodynamic mobilizations targeting the median nerve, Grip ([Formula: see text]) and load ([Formula: see text]) forces applied by the thumb, index and major fingers (three-jaw chuck pinch) were collected using a manipulandum during three different Grip precision tasks: Grip-lift-hold-replace (GLHR), vertical oscillations (OSC), and vertical oscillations with up and down collisions (OSC/COLL/u, OSC/COLL/d). Several parameters were collected or computed from [Formula: see text] and [Formula: see text]. Maximum pinch strength and fingertips pressure sensation threshold were also examined. After the mobilizations, [Formula: see text] max changes from 3.2 ± 0.4 to 3.4 ± 0.4 N (p = 0.014), d[Formula: see text] from 89.0 ± 66.6 to 102.2 ± 59.6 [Formula: see text] (p = 0.009), and d[Formula: see text] from 43.6 ± 17.0 to 56.0 ± 17.9 [Formula: see text] ([Formula: see text]0.001) during GLHR. [Formula: see text] SD changes from 0.9 ± 0.3 to 1.0 ± 0.2 N (p = 0.004) during OSC. [Formula: see text] peak changes from 17.4 ± 8.3 to 15.1 ± 7.5 N ([Formula: see text]0.001), [Formula: see text] from 12.4 ± 6.7 to 11.3 ± 6.8 N (p = 0.033), and [Formula: see text] from 2.9 ± 0.4 to 3.00 ± 0.4 N (p = 0.018) during OSC/COLL/u. [Formula: see text] peak changes from 13.5 ± 7.4 to 12.3 ± 7.7 N (p = 0.030) and [Formula: see text] from 14.5 ± 6.0 to 13.6 ± 5.5 N (p = 0.018) during OSC/COLL/d. Sensation thresholds at index and thumb were reduced (p = 0.001, p = 0.008). Precision Grip adaptations observed after the mobilizations could be partly explained by changes in cutaneous median-nerve pressure afferents from the thumb and index fingertips.
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Fine adaptive precision Grip Control without maximum pinch strength changes after upper limb neurodynamic mobilization
'Springer Science and Business Media LLC', 2021Co-Authors: Frédéric Dierick, Jean-michel Brismée, Olivier White, Anne-france Bouché, Céline Périchon, Nastasia Filoni, Vincent Barvaux, Fabien BuisseretAbstract:Abstract Before and immediately after passive upper limb neurodynamic mobilizations targeting the median nerve, Grip ( $$G_F$$ G F ) and load ( $$L_F$$ L F ) forces applied by the thumb, index and major fingers (three-jaw chuck pinch) were collected using a manipulandum during three different Grip precision tasks: Grip-lift-hold-replace (GLHR), vertical oscillations (OSC), and vertical oscillations with up and down collisions (OSC/COLL/u, OSC/COLL/d). Several parameters were collected or computed from $$G_F$$ G F and $$L_F$$ L F . Maximum pinch strength and fingertips pressure sensation threshold were also examined. After the mobilizations, $$L_F$$ L F max changes from 3.2 ± 0.4 to 3.4 ± 0.4 N (p = 0.014), d $$G_F$$ G F from 89.0 ± 66.6 to 102.2 ± 59.6 $$N~\text{s}^{-1}$$ N s - 1 (p = 0.009), and d $$L_F$$ L F from 43.6 ± 17.0 to 56.0 ± 17.9 $$N~\text{s}^{-1}$$ N s - 1 ( $$p
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Fine adaptive Control of precision Grip without maximum pinch strength changes after median nerve mobilization
2020Co-Authors: Frédéric Dierick, Jean-michel Brismée, Olivier White, Anne-france Bouché, Céline Périchon, Nastasia Filoni, Vincent Barvaux, Fabien BuisseretAbstract:ABSTRACT Fine dexterity critically depends on information conveyed by the median nerve. While the effects of its compression and vibration are well characterized, little is known about longitudinal tension and excursion. Using a force-sensitive manipulandum, a numeric dynamometer and Semmes-Weinstein monofilaments, we examined the adaptations of precision Grip Control, maximum pinch strength and fingertips pressure sensation threshold before and immediately after the application of longitudinal tension and excursion mobilizations applied on the median nerve. Grip (GF) and load (LF) forces applied by the thumb, index and major fingers were collected in 40 healthy young participants during three different Grip precision tasks along the direction of gravity. For Grip-lift-drop task, maximum GF and LF and their first time derivatives were computed. For up-down oscillations, means of GF and LF and their variability were computed. For oscillations with up and down collisions, peaks of GF and LF, time delay between GF peak and contact, and values of GF and LF at contact were collected. Our findings show that median nerve mobilizations induce significant fine adaptations of precision Grip Control in the three different tasks but mainly during Grip-lift-drop and oscillations with collisions. Fingertips pressure sensation thresholds at index and thumb were significantly reduced after the mobilizations. No significant changes were observed for maximum pinch strength. We conclude that precision Grip adaptations observed after median mobilizations could be partly explained by changes in cutaneous median-nerve mechanoreceptive afferents from the thumb and index fingertips.
Andrew M Gordon - One of the best experts on this subject based on the ideXlab platform.
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precision Grip Control sensory impairments and their interactions in children with hemiplegic cerebral palsy a systematic review
Research in Developmental Disabilities, 2013Co-Authors: Yannick Bleyenheuft, Andrew M GordonAbstract:Children with hemiplegic cerebral palsy (HCP) exhibit long-term functional deficits. One of the most debilitating is the loss of prehension since this may impair functional independence. This loss of prehension could be partly due to sensory deficits. Identifying the underlying causes of prehension deficits and their potential link with sensory disorders is important to better adapt neurorehabilitation. Here we provide an overview of precision Grip and sensory impairments in individuals with HCP, and the relation between them, in order to determine whether the sensory impairments influence the type and magnitude of deficits as measured by studies of prehensile force Control. Pubmed and Scopus databases were used to search studies from 1990 to 2012, using combinations of the following keywords: fingertip force; Grip force; precision Grip; sensory deficit; sensory impairment; tactile discrimination; with cerebral palsy. Of the 190 studies detected through the systematic search; 38 were finally included in the systematic part of this review. This review shows that sensory deficits are common and are likely underestimated using standard clinical assessments in HCP. Some studies suggest these deficits are the basis of predictive motor Control impairments in these individuals. However, children with HCP retain some ability to use predictive Control, even if it is impaired in the more affected hand. Intensive practice and initial use of the less affected hand, which has only subtle sensory deficits, has been shown to remediate impairments in anticipatory motor Control during subsequent use of the more affected hand. Implications for motor and sensory rehabilitation of individuals with HCP are discussed.
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coordination of fingertip forces during precision Grip in premanifest huntington s disease
Movement Disorders, 2011Co-Authors: Ashwini Rao, Andrew M Gordon, Karen MarderAbstract:Precision Grip Control is important for accurate object manipulation and requires coordination between horizontal (Grip) and vertical (load) fingertip forces. Manifest Huntington's disease (HD) subjects demonstrate excessive and highly variable Grip force and delayed coordination between Grip and load forces. Because the onset of these impairments is unknown, we examined precision Grip Control in premanifest HD (pre-HD) subjects. Fifteen pre-HD and 15 age- and sex-matched Controls performed the precision Grip task in a seated position. Subjects grasped and lifted an object instrumented with a force transducer that measured horizontal Grip and vertical load forces. Outcomes were preload time, loading time, maximum Grip force, mean static Grip force, and variability for all measures. We compared outcomes across groups and correlated Grip measures with the Unified Huntington's Disease Rating Scale and predicted age of onset. Variability of maximum Grip force (P < .0001) and variability of static Grip force (P < .00001) were higher for pre-HD subjects. Preload time (P < .007) and variability of preload time (P < .006) were higher in pre-HD subjects. No differences were seen in loading time across groups. Variability of static Grip force (r(2) = 0.23) and variability of preload time (r(2) = 0.59) increased with predicted onset and were correlated with tests of cognitive function. Our results indicate that pre-HD patients have poor regulation of the transition between reach and grasp and higher variability in force application and temporal coordination during the precision Grip task. Force and temporal variability may be good markers of disease severity because they were correlated with predicted onset of disease.
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development of hand function and precision Grip Control in individuals with cerebral palsy a 13 year follow up study
Pediatrics, 2006Co-Authors: Annchristin Eliasson, Hans Forssberg, Yaching Hung, Andrew M GordonAbstract:OBJECTIVE. Although children with cerebral palsy display large developmental differences in hand function from that of typically developing children by the age of 6 to 10 years, little is known about the developmental processes underlying hand function during subsequent development. In this study we investigated the development of manual dexterity in a timed motor task, the timing and amplitude of fingertip-force application during a precision grasping task, and the relationship between changes in these measures. We applied highly quantitative analytical approaches to determine if the fingertip-force application pattern and trial-to-trial variation of fingertip-force application change during development. METHODS. Twelve subjects with cerebral palsy (aged 6–8 years) participated in the first data-collection session conducted between 1989 and 1990. Ten of these subjects (5 with hemiplegia and 5 with diplegia, aged 19–21 years) returned between 2002 and 2003. Manual dexterity was measured by using timed tasks of the Jebsen-Taylor test of hand function. Subjects also lifted an object instrumented with force transducers while we measured the temporal coordination of fingertip coordination and the path ratio between the Grip and vertical load-force trajectory (straightness). We used generalized procrustes analysis to determine if there were changes in shape of the force trajectory and intertrial variability. RESULTS. The Jebsen-Taylor test times decreased 45% from the first to the second data session. The overall time to complete the Grip-lift task decreased 22%, mainly because of a faster transition from grasp to lift. The Grip-force/load-force path ratios decreased from 1.7 to 1.35 (1 = straight line). Generalized procrustes analysis indicated a change in the shape and a decrease in variability in shape of the force-ratio path. CONCLUSIONS. Our results demonstrate that the efficiency in grasping had developed during a 13-year period for this small group of participants with cerebral palsy, which suggests that improvement in hand function occurs over a longer time frame than commonly would be expected.
Frédéric Dierick - One of the best experts on this subject based on the ideXlab platform.
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fine adaptive precision Grip Control without maximum pinch strength changes after upper limb neurodynamic mobilization
Scientific Reports, 2021Co-Authors: Frédéric Dierick, Jean-michel Brismée, Olivier White, Anne-france Bouché, Céline Périchon, Nastasia Filoni, Vincent Barvaux, Fabien BuisseretAbstract:Before and immediately after passive upper limb neurodynamic mobilizations targeting the median nerve, Grip ([Formula: see text]) and load ([Formula: see text]) forces applied by the thumb, index and major fingers (three-jaw chuck pinch) were collected using a manipulandum during three different Grip precision tasks: Grip-lift-hold-replace (GLHR), vertical oscillations (OSC), and vertical oscillations with up and down collisions (OSC/COLL/u, OSC/COLL/d). Several parameters were collected or computed from [Formula: see text] and [Formula: see text]. Maximum pinch strength and fingertips pressure sensation threshold were also examined. After the mobilizations, [Formula: see text] max changes from 3.2 ± 0.4 to 3.4 ± 0.4 N (p = 0.014), d[Formula: see text] from 89.0 ± 66.6 to 102.2 ± 59.6 [Formula: see text] (p = 0.009), and d[Formula: see text] from 43.6 ± 17.0 to 56.0 ± 17.9 [Formula: see text] ([Formula: see text]0.001) during GLHR. [Formula: see text] SD changes from 0.9 ± 0.3 to 1.0 ± 0.2 N (p = 0.004) during OSC. [Formula: see text] peak changes from 17.4 ± 8.3 to 15.1 ± 7.5 N ([Formula: see text]0.001), [Formula: see text] from 12.4 ± 6.7 to 11.3 ± 6.8 N (p = 0.033), and [Formula: see text] from 2.9 ± 0.4 to 3.00 ± 0.4 N (p = 0.018) during OSC/COLL/u. [Formula: see text] peak changes from 13.5 ± 7.4 to 12.3 ± 7.7 N (p = 0.030) and [Formula: see text] from 14.5 ± 6.0 to 13.6 ± 5.5 N (p = 0.018) during OSC/COLL/d. Sensation thresholds at index and thumb were reduced (p = 0.001, p = 0.008). Precision Grip adaptations observed after the mobilizations could be partly explained by changes in cutaneous median-nerve pressure afferents from the thumb and index fingertips.
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Fine adaptive precision Grip Control without maximum pinch strength changes after upper limb neurodynamic mobilization
'Springer Science and Business Media LLC', 2021Co-Authors: Frédéric Dierick, Jean-michel Brismée, Olivier White, Anne-france Bouché, Céline Périchon, Nastasia Filoni, Vincent Barvaux, Fabien BuisseretAbstract:Abstract Before and immediately after passive upper limb neurodynamic mobilizations targeting the median nerve, Grip ( $$G_F$$ G F ) and load ( $$L_F$$ L F ) forces applied by the thumb, index and major fingers (three-jaw chuck pinch) were collected using a manipulandum during three different Grip precision tasks: Grip-lift-hold-replace (GLHR), vertical oscillations (OSC), and vertical oscillations with up and down collisions (OSC/COLL/u, OSC/COLL/d). Several parameters were collected or computed from $$G_F$$ G F and $$L_F$$ L F . Maximum pinch strength and fingertips pressure sensation threshold were also examined. After the mobilizations, $$L_F$$ L F max changes from 3.2 ± 0.4 to 3.4 ± 0.4 N (p = 0.014), d $$G_F$$ G F from 89.0 ± 66.6 to 102.2 ± 59.6 $$N~\text{s}^{-1}$$ N s - 1 (p = 0.009), and d $$L_F$$ L F from 43.6 ± 17.0 to 56.0 ± 17.9 $$N~\text{s}^{-1}$$ N s - 1 ( $$p
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Fine adaptive Control of precision Grip without maximum pinch strength changes after median nerve mobilization
2020Co-Authors: Frédéric Dierick, Jean-michel Brismée, Olivier White, Anne-france Bouché, Céline Périchon, Nastasia Filoni, Vincent Barvaux, Fabien BuisseretAbstract:ABSTRACT Fine dexterity critically depends on information conveyed by the median nerve. While the effects of its compression and vibration are well characterized, little is known about longitudinal tension and excursion. Using a force-sensitive manipulandum, a numeric dynamometer and Semmes-Weinstein monofilaments, we examined the adaptations of precision Grip Control, maximum pinch strength and fingertips pressure sensation threshold before and immediately after the application of longitudinal tension and excursion mobilizations applied on the median nerve. Grip (GF) and load (LF) forces applied by the thumb, index and major fingers were collected in 40 healthy young participants during three different Grip precision tasks along the direction of gravity. For Grip-lift-drop task, maximum GF and LF and their first time derivatives were computed. For up-down oscillations, means of GF and LF and their variability were computed. For oscillations with up and down collisions, peaks of GF and LF, time delay between GF peak and contact, and values of GF and LF at contact were collected. Our findings show that median nerve mobilizations induce significant fine adaptations of precision Grip Control in the three different tasks but mainly during Grip-lift-drop and oscillations with collisions. Fingertips pressure sensation thresholds at index and thumb were significantly reduced after the mobilizations. No significant changes were observed for maximum pinch strength. We conclude that precision Grip adaptations observed after median mobilizations could be partly explained by changes in cutaneous median-nerve mechanoreceptive afferents from the thumb and index fingertips.
Anne-france Bouché - One of the best experts on this subject based on the ideXlab platform.
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fine adaptive precision Grip Control without maximum pinch strength changes after upper limb neurodynamic mobilization
Scientific Reports, 2021Co-Authors: Frédéric Dierick, Jean-michel Brismée, Olivier White, Anne-france Bouché, Céline Périchon, Nastasia Filoni, Vincent Barvaux, Fabien BuisseretAbstract:Before and immediately after passive upper limb neurodynamic mobilizations targeting the median nerve, Grip ([Formula: see text]) and load ([Formula: see text]) forces applied by the thumb, index and major fingers (three-jaw chuck pinch) were collected using a manipulandum during three different Grip precision tasks: Grip-lift-hold-replace (GLHR), vertical oscillations (OSC), and vertical oscillations with up and down collisions (OSC/COLL/u, OSC/COLL/d). Several parameters were collected or computed from [Formula: see text] and [Formula: see text]. Maximum pinch strength and fingertips pressure sensation threshold were also examined. After the mobilizations, [Formula: see text] max changes from 3.2 ± 0.4 to 3.4 ± 0.4 N (p = 0.014), d[Formula: see text] from 89.0 ± 66.6 to 102.2 ± 59.6 [Formula: see text] (p = 0.009), and d[Formula: see text] from 43.6 ± 17.0 to 56.0 ± 17.9 [Formula: see text] ([Formula: see text]0.001) during GLHR. [Formula: see text] SD changes from 0.9 ± 0.3 to 1.0 ± 0.2 N (p = 0.004) during OSC. [Formula: see text] peak changes from 17.4 ± 8.3 to 15.1 ± 7.5 N ([Formula: see text]0.001), [Formula: see text] from 12.4 ± 6.7 to 11.3 ± 6.8 N (p = 0.033), and [Formula: see text] from 2.9 ± 0.4 to 3.00 ± 0.4 N (p = 0.018) during OSC/COLL/u. [Formula: see text] peak changes from 13.5 ± 7.4 to 12.3 ± 7.7 N (p = 0.030) and [Formula: see text] from 14.5 ± 6.0 to 13.6 ± 5.5 N (p = 0.018) during OSC/COLL/d. Sensation thresholds at index and thumb were reduced (p = 0.001, p = 0.008). Precision Grip adaptations observed after the mobilizations could be partly explained by changes in cutaneous median-nerve pressure afferents from the thumb and index fingertips.
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Fine adaptive precision Grip Control without maximum pinch strength changes after upper limb neurodynamic mobilization
'Springer Science and Business Media LLC', 2021Co-Authors: Frédéric Dierick, Jean-michel Brismée, Olivier White, Anne-france Bouché, Céline Périchon, Nastasia Filoni, Vincent Barvaux, Fabien BuisseretAbstract:Abstract Before and immediately after passive upper limb neurodynamic mobilizations targeting the median nerve, Grip ( $$G_F$$ G F ) and load ( $$L_F$$ L F ) forces applied by the thumb, index and major fingers (three-jaw chuck pinch) were collected using a manipulandum during three different Grip precision tasks: Grip-lift-hold-replace (GLHR), vertical oscillations (OSC), and vertical oscillations with up and down collisions (OSC/COLL/u, OSC/COLL/d). Several parameters were collected or computed from $$G_F$$ G F and $$L_F$$ L F . Maximum pinch strength and fingertips pressure sensation threshold were also examined. After the mobilizations, $$L_F$$ L F max changes from 3.2 ± 0.4 to 3.4 ± 0.4 N (p = 0.014), d $$G_F$$ G F from 89.0 ± 66.6 to 102.2 ± 59.6 $$N~\text{s}^{-1}$$ N s - 1 (p = 0.009), and d $$L_F$$ L F from 43.6 ± 17.0 to 56.0 ± 17.9 $$N~\text{s}^{-1}$$ N s - 1 ( $$p
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Fine adaptive Control of precision Grip without maximum pinch strength changes after median nerve mobilization
2020Co-Authors: Frédéric Dierick, Jean-michel Brismée, Olivier White, Anne-france Bouché, Céline Périchon, Nastasia Filoni, Vincent Barvaux, Fabien BuisseretAbstract:ABSTRACT Fine dexterity critically depends on information conveyed by the median nerve. While the effects of its compression and vibration are well characterized, little is known about longitudinal tension and excursion. Using a force-sensitive manipulandum, a numeric dynamometer and Semmes-Weinstein monofilaments, we examined the adaptations of precision Grip Control, maximum pinch strength and fingertips pressure sensation threshold before and immediately after the application of longitudinal tension and excursion mobilizations applied on the median nerve. Grip (GF) and load (LF) forces applied by the thumb, index and major fingers were collected in 40 healthy young participants during three different Grip precision tasks along the direction of gravity. For Grip-lift-drop task, maximum GF and LF and their first time derivatives were computed. For up-down oscillations, means of GF and LF and their variability were computed. For oscillations with up and down collisions, peaks of GF and LF, time delay between GF peak and contact, and values of GF and LF at contact were collected. Our findings show that median nerve mobilizations induce significant fine adaptations of precision Grip Control in the three different tasks but mainly during Grip-lift-drop and oscillations with collisions. Fingertips pressure sensation thresholds at index and thumb were significantly reduced after the mobilizations. No significant changes were observed for maximum pinch strength. We conclude that precision Grip adaptations observed after median mobilizations could be partly explained by changes in cutaneous median-nerve mechanoreceptive afferents from the thumb and index fingertips.
