Effects of Carpal Tunnel Syndrome on Force Coordination and Muscle Coherence during Precision Pinch

Lu, Szu Ching; Xiu, Kaihua; Li, Ké; Marquardt, Tamara L.; Evans, Peter; Li, Zong-Ming

doi:10.1007/s40846-017-0232-6

Cited by 9 publications

(7 citation statements)

References 38 publications

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“…Relative to the other intrinsic muscles the ABP and FDI muscles are easy to access by the surface EMG electrodes. In literature, the APB and FDI are a muscle pair that has been frequently examined, particularly in the studies focusing on the intermuscular coherence or neural drive coordination for dexterous manual tasks 46 , 55 . It is noteworthy that more muscles, including the intrinsic muscles like the flexor pollicis brevis and opponens pollicis and the extrinsic muscles like the abductor policis longus and extensor pollicis brevis, may also contract synergistically with the APB during precision grip.…”

Section: Discussionmentioning

confidence: 99%

Dynamical Coordination of Hand Intrinsic Muscles for Precision Grip in Diabetes Mellitus

Wei

Cheng

et al. 2018

Sci Rep

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This study investigated the effects of diabetes mellitus (DM) on dynamical coordination of hand intrinsic muscles during precision grip. Precision grip was tested using a custom designed apparatus with stable and unstable loads, during which the surface electromyographic (sEMG) signals of the abductor pollicis brevis (APB) and first dorsal interosseous (FDI) were recorded simultaneously. Recurrence quantification analysis (RQA) was applied to quantify the dynamical structure of sEMG signals of the APB and FDI; and cross recurrence quantification analysis (CRQA) was used to assess the intermuscular coupling between the two intrinsic muscles. This study revealed that the DM altered the dynamical structure of muscle activation for the FDI and the dynamical intermuscular coordination between the APB and FDI during precision grip. A reinforced feedforward mechanism that compensates the loss of sensory feedbacks in DM may be responsible for the stronger intermuscular coupling between the APB and FDI muscles. Sensory deficits in DM remarkably decreased the capacity of online motor adjustment based on sensory feedback, rendering a lower adaptability to the uncertainty of environment. This study shed light on inherent dynamical properties underlying the intrinsic muscle activation and intermuscular coordination for precision grip and the effects of DM on hand sensorimotor function.Diabetes mellitus (DM) is a metabolic disorder characterized by chronic high blood glucose levels. A primary complication of DM is diabetic peripheral neuropathy (DPN), which has a prevalence from 30% to 50% of the patients with DM 1 . Conventional standpoint suggested that the symptoms of DPN mostly manifest on the lower limbs 2,3 , while a growing number of studies highlighted the effects of DPN on the upper-limbs 1,4 . Approximately 58% to 82% and 37% to 69% of patients with DM suffer from subclinical neuropathy on their median nerves and ulnar nerves, respectively, exhibiting confined digit range of motion, reduced grip and pinch strength, decreased tactile sensitivity or slower nerve conduction velocity [5][6][7][8][9] .Quantitative evaluation of the hand sensorimotor function provides a useful tool for clinical diagnosis of DPN 10 . Accumulating evidence suggests that the effects of DM on hand sensorimotor function could be observed from precision grip -a fundamental grasping manner with opposable thumb and index finger. For example, the patients with DM showed reduced force structural complexity (lower approximate entropy values) than healthy subjects when producing grip force upon a spatially fixed apparatus within 15-50% maximum voluntary contraction (MVC) 11 . Compared to the healthy subjects, the DM patients showed higher force ratio in execution of grip-to-lift task; and the force ratio could serve as indicator to DPN whose sensitivity was 85% and specificity was 51% 10 . The debilitated grip force in DM is associated with reduced tactile sensitivity, blurred afferent inputs and reduced efferent conductivity [10][11][12][13] , and i...

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Section: Discussionmentioning

confidence: 99%

Dynamical Coordination of Hand Intrinsic Muscles for Precision Grip in Diabetes Mellitus

Wei

Cheng

et al. 2018

Sci Rep

Self Cite

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“…New instruments for the risk assessment of biomechanical overload reported in the recent scientific literature are sEMG and systems of objective measurement of the force in grip or pinch grip [ 20 , 21 , 22 , 23 ]. The main aim of such studies is to evaluate objective tools for biomechanical overload risk assessment but also looking for new limit values for strain exertion [ 24 ] and evaluation of differences in the mean pinch strength values in terms of age and sex [ 25 ].…”

Section: Discussionmentioning

confidence: 99%

Pinch Grip per SE Is Not an Occupational Risk Factor for the Musculoskeletal System: An Experimental Study on Field

Sala

Lopomo

Romagnoli

et al. 2022

IJERPH

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Introduction: Some ergonomic evaluation methods define pinch grip as a risk factor independent of the exerted force. The present experimental study was performed with the main aim of objectively measuring the muscle engagement during the execution of pinch grip. Methods: the participants of the study were healthy workers occupationally involved in a high-intensity repetitive job related to the sorting of letters and small packages. Surface electromyography (sEMG) was used to study the activity of the abductor pollicis brevis and first dorsal interosseous fibers related to the execution of the required working tasks, while the force exerted during voluntary muscle contraction for pinch grip was measured by a portable acquisition system. The subjects were specifically asked to exert the maximum voluntary isometric contraction (MVIC) and further voluntary isometric contractions with a spontaneous force (SF) equal to 10%,20% and 50% of the MVIC; finally, the workers were asked to hold in pinch grip two types of envelopes, weighing 100 g and 500 g, respectively. Results: The force required to pinch 100 and 500 g envelopes by the fifteen subjects of the study corresponded to 4 and 5% MVIC, respectively. The corresponding sEMG average rectified values (ARV) were approximately 6% of that at MVIC for first dorsal interosseus (FDI) fibers and approximately 20–25% of MVIC for abductor pollicis brevis (ABP) fibers. Bivariate correlation analysis showed significant relationships between force at MVIC and FDI ARV at MCV. Conclusions: The obtained results demonstrate that muscle recruitment during pinch grip varies as a function of the SF: not only the position but also the exerted force should be considered when assessing the pinch grip as risk factor for biomechanical overload of the upper limb.

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“…The motor task assessed in the present study was pinch force control time because the speed under conditions of task precision of a skill are essential for work and task performance 39 . The MVC of pinch force was calculated prior to practicing the pinch task using a digital pinch meter.…”

Section: Methodsmentioning

confidence: 99%

Differences in motor imagery strategy change behavioral outcome

Fukumoto

Todo²,

Bunno³

et al. 2022

Sci Rep

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Kinesthetic motor imagery (KMI) involves imagining the feeling and experience of movements. We examined the effects of KMI, number visualizing, and KMI with number visualizing on the excitability of spinal motor neurons and a behavioral outcome measure in a pinch force task. Healthy participants (13 men and 8 women; mean age: 24.8 ± 5.5 years) were recruited. We compared the F-waves of the left thenar muscles after stimulating the left median nerve at the wrist during each motor imagery condition after a practice session. The KMI condition consisted of imagining muscle contraction, the number visualizing condition consisted of imagining the pinch force increasing numerically, and the KMI with number visualizing consisted of alternating between the KMI and imagining the pinch force increasing numerically. Before and after motor imagery, the time required to adjust to the target pinch force was compared. The time required to adjust the pinch force was shorter in the KMI with number visualizing condition than in the KMI and number visualizing conditions. There was no difference in the F/M amplitude ratio between each MI strategy condition, indicating the excitability of spinal motor neurons. Numerical information helped to improve the ability of participants to perform KMI.

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Effects of Carpal Tunnel Syndrome on Force Coordination and Muscle Coherence during Precision Pinch

Cited by 9 publications

References 38 publications

Dynamical Coordination of Hand Intrinsic Muscles for Precision Grip in Diabetes Mellitus

Dynamical Coordination of Hand Intrinsic Muscles for Precision Grip in Diabetes Mellitus

Pinch Grip per SE Is Not an Occupational Risk Factor for the Musculoskeletal System: An Experimental Study on Field

Differences in motor imagery strategy change behavioral outcome

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