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https://www.readbyqxmd.com/read/28436890/in-situ-force-augmentation-improves-surface-contact-and-force-control
#1
Randy Lee, Roberta Klatzky, George Stetten
Surgeons routinely perform surgery with noisy, sub-threshold, or obscured visual and haptic feedback, either due to the necessary surgical approach, or because the systems on which they are operating are exceedingly delicate. Technological solutions incorporating haptic feedback augmentation have been proposed to address these difficulties, but the consequences for motor control have not been directly investigated and quantified. In this paper, we present two isometric force generation tasks performed with a hand-held robotic tool that provides in-situ augmentation of force sensation...
April 24, 2017: IEEE Transactions on Haptics
https://www.readbyqxmd.com/read/28401502/the-effects-of-age-and-sex-on-hand-movement-structure
#2
A Sebastjan, A Skrzek, Z Ignasiak, T Sławińska
The aim was to investigate the effects of age and sex on hand function and ascertain age-related changes (magnitude and rate) by assessing a broad range of functional tasks with the dominant and non-dominant hands. A representative sample of 635 adults (114 males and 491 females) aged 50 years and over completed motor performance series of the Vienna Test System Parametric and non-parametric analysis and simple linear regression was used to examine the relationships. Significant relationships were observed between task performance and age and sex, although the contributions of both factors differed by varying degree...
April 11, 2017: Aging Clinical and Experimental Research
https://www.readbyqxmd.com/read/28397018/functional-capacity-evaluation-in-upper-limb-reduction-deficiency-and-amputation-development-and-pilot-testing
#3
S G Postema, R M Bongers, M F Reneman, C K van der Sluis
Purpose To develop and pilot test a functional capacity evaluation (FCE) for individuals with upper limb absence (ULA) due to reduction deficiency or amputation, and to examine the relationship between FCE results and presence of musculoskeletal complaints (MSC). Method Five tests (overhead lifting, overhead working, repetitive reaching, fingertip dexterity, and handgrip strength) were selected and adapted if necessary. The newly developed FCE, called FCE-One-Handed (FCE-OH), was pilot tested in 20 adults individuals with ULA, and 20 matched controls...
April 10, 2017: Journal of Occupational Rehabilitation
https://www.readbyqxmd.com/read/28383292/corticomotor-excitability-effects-of-peripheral-nerve-electrical-stimulation-to-the-paretic-arm-in-stroke
#4
Hao Liu, Stephanie S Y Au-Yeung
OBJECTIVE: This study aimed to examine the corticomotor excitability changes after peripheral nerve electrical stimulation (PNS) on the stroke-impaired arm. DESIGN: This randomized cross-over study included 32 subjects with chronic stroke. They received a 1-hr PNS or placebo PNS by random order to the ulnar and radial nerves of the paretic arm in separate sessions. The primary outcome was excitability of the corticospinal projections for the contralateral first dorsal interosseous hand muscle in terms of slope of the recruitment curve, peak motor-evoked potential amplitude, and duration of the cortical silent period, measured with transcranial magnetic stimulation on both cerebral hemispheres...
April 5, 2017: American Journal of Physical Medicine & Rehabilitation
https://www.readbyqxmd.com/read/28381999/cognitive-processing-speed-across-the-lifespan-beyond-the-influence-of-motor-speed
#5
Deena Ebaid, Sheila G Crewther, Kirsty MacCalman, Alyse Brown, Daniel P Crewther
Traditional neuropsychological measurement of cognitive processing speed with tasks such as the Symbol Search and Coding subsets of the WAIS-IV, consistently show decline with advancing age. This is potentially problematic with populations where deficits in motor performance are expected, i.e., in aging or stroke populations. Thus, the aim of the current study was to explore the contribution of hand motor speed to traditional paper-and-pencil measures of processing speed and to a simple computer-customized non-motor perception decision task, the Inspection Time (IT) task...
2017: Frontiers in Aging Neuroscience
https://www.readbyqxmd.com/read/28366013/do-impairments-predict-hand-dexterity-after-distal-radius-fractures-a-6-month-prospective-cohort-study
#6
Pavlos Bobos, Emily A Lalone, Ruby Grewal, Joy C MacDermid
BACKGROUND: The relationship of routinely measured grip and motion measures may be related to hand dexterity. This has not yet been thoroughly examined following a distal radius fracture (DRF). The purpose of this study was to investigate if impairments in range of motion (ROM) and grip strength predict hand dexterity 6 months following a DRF. METHODS: Patients with DRFs were recruited from a specialized hand clinic. Hand grip was assessed with a J-Tech dynamometer; ROM was measured using standard landmarks and a manual goniometer...
March 1, 2017: Hand: Official Journal of the American Association for Hand Surgery
https://www.readbyqxmd.com/read/28358140/a-pilot-study-on-transient-ischemic-stroke-induced-with-endothelin-1-in-the-rhesus-monkeys
#7
PeiMin Dai, Hui Huang, Lin Zhang, Jing He, XuDong Zhao, FuHan Yang, Ning Zhao, JianZhen Yang, LongJiao Ge, Yu Lin, HuaLin Yu, JianHong Wang
Endothelin-1 (ET-1), a vasoconstrictor, has recently been used to induce focal ischemia in rodents and marmoset monkeys. The rhesus monkey, however, has numerous advantages to the rodent and marmoset that make it a superior and irreplaceable animal model for studying stroke in the brain. In the present study, after mapping the preferred hand representation in two healthy male monkeys with intracortical micro-stimulation, ET-1 was microinjected into the contralateral motor cortex (M1) to its preferred hand. The monkeys had been trained in three manual dexterity tasks before the microinjection and were tested for these tasks following the ET-1 injection...
March 30, 2017: Scientific Reports
https://www.readbyqxmd.com/read/28356630/activities-of-daily-living-and-manual-hand-dexterity-in-persons-with-idiopathic-parkinson-disease
#8
Yoo-Im Choi, Chiang-Soon Song, Byung-Yoon Chun
[Purpose] The purpose of this study was to evaluate the relationship between daily activities and manual dexterity in persons with Parkinson disease. [Subjects and Methods] The study participants were 25 patients with idiopathic Parkinson disease. This study used two clinical tools, the box-and-block test and Schwab and England Activities of Daily Living scale, to investigate the relationship between manual dexterity and Schwab and England Activities of Daily Living score. [Results] A positive correlation was observed between the Schwab and England Activities of Daily Living and the box-and-block test scores on the more and less affected sides...
March 2017: Journal of Physical Therapy Science
https://www.readbyqxmd.com/read/28343852/hand-grip-strength-and-dexterity-function-in-children-aged-6-12-years-a-cross-sectional-study
#9
Mohammed T A Omar, Ahmad H Alghadir, Hamayun Zafar, Shaheerah Al Baker
STUDY DESIGN: Cross-sectional and clinical measurement. INTRODUCTION: Assessment of hand function considers an essential part in clinical practice. PURPOSE OF THE STUDY: To develop normative values of hand grip strength and dexterity function for 6-12-year-old children in Saudi Arabia. METHODS: Grip strength and dexterity function was measured in 525 children using Grip Track hand dynamometer (JTECH Medical, Midvale, UT, USA) and 9-hole pegboard test respectively...
March 23, 2017: Journal of Hand Therapy: Official Journal of the American Society of Hand Therapists
https://www.readbyqxmd.com/read/28336344/participation-restriction-in-people-with-multiple-sclerosis-prevalence-and-correlations-with-cognitive-walking-balance-and-upper-limb-impairments
#10
Davide Cattaneo, Ilse Lamers, Rita Bertoni, Peter Feys, Johanna Jonsdottir
OBJECTIVE: To calculate percentage of participation restrictions according to disability level in Multiple Sclerosis (MS) and to assess relationship between participation restriction, and cognitive, gait, balance and upper limb deficits. DESIGN: Cross sectional study SETTING: Rehabilitation unit PARTICIPANTS: 105 people with MS and 20 healthy subjects (HS) were screened in Belgium and Italy. INTERVENTIONS: Not applicable MAIN OUTCOME MEASURES: The Community integration questionnaire was used to assess participation in Home, Social and Productive Activities...
March 21, 2017: Archives of Physical Medicine and Rehabilitation
https://www.readbyqxmd.com/read/28336243/hand-arm-vibration-syndrome-workers-experience-with-functional-impairment-and-disability
#11
Midori Handford, Kiera Lepine, Kristina Boccia, Francesca Ruddick, Darya Alyeksyeyeva, Aaron Thompson, D Linn Holness, Sharon Switzer-McIntyre
STUDY DESIGN: Qualitative and descriptive study. INTRODUCTION: Hand-arm vibration syndrome (HAVS) is a prevalent disease in Canada. There is little work on the perspectives of HAVS patients. PURPOSE OF THE STUDY: Explore perceptions of disability and functional compromise in patients with HAVS. METHODS: Semi-structured telephone interviews were conducted with HAVS patients and analysed using content analysis. RESULTS: The 11 participants reported numbness, pain, and reduced dexterity, strength, and sensation...
March 20, 2017: Journal of Hand Therapy: Official Journal of the American Society of Hand Therapists
https://www.readbyqxmd.com/read/28295921/earlier-and-greater-hand-pre-shaping-in-the-elderly-a-study-based-on-kinematic-analysis-of-reaching-movements-to-grasp-objects
#12
Yoshiki Tamaru, Yasuo Naito, Takashi Nishikawa
BACKGROUND: Elderly people are less able to manipulate objects skilfully than young adults. Although previous studies have examined age-related deterioration of hand movements with a focus on the phase after grasping objects, the changes in the reaching phase have not been studied thus far. We aimed to examine whether changes in hand shape patterns during the reaching phase of grasping movements differ between young adults and the elderly. METHODS: Ten healthy elderly adults and 10 healthy young adults were examined using the Simple Test for Evaluating Hand Functions and kinetic analysis of hand pre-shaping reach-to-grasp tasks...
March 9, 2017: Psychogeriatrics: the Official Journal of the Japanese Psychogeriatric Society
https://www.readbyqxmd.com/read/28289680/synergy-repetition-training-versus-task-repetition-training-in-acquiring-new-skill
#13
Vrajeshri Patel, Jamie Craig, Michelle Schumacher, Martin K Burns, Ionut Florescu, Ramana Vinjamuri
Traditionally, repetitive practice of a task is used to learn a new skill, exhibiting as immediately improved performance. Research suggests, however, that a more experience-based rather than exposure-based training protocol may allow for better transference of the skill to related tasks. In synergy-based motor control theory, fundamental motor skills, such as hand grasping, are represented with a synergy subspace that captures essential motor patterns. In this study, we propose that motor-skill learning through synergy-based mechanisms may provide advantages over traditional task repetition learning...
2017: Frontiers in Bioengineering and Biotechnology
https://www.readbyqxmd.com/read/28285090/assessment-of-the-ipsilesional-hand-function-in-stroke-survivors-the-effect-of-lesion-side
#14
Bianca Pinto Cunha, Sandra Maria Sbeghen Ferreira de Freitas, Paulo Barbosa de Freitas
BACKGROUND: The aim of this study was to examine the effect of the side of brain lesion on the ipsilesional hand function of stroke survivors. METHODS: Twenty-four chronic stroke survivors, equally allocated in 2 groups according to the side of brain lesion (right or left), and 12 sex- and age-matched healthy controls performed the Jebsen-Taylor Hand Function Test (JTHFT), the Nine-Hole Peg Test (9HPT), the maximum power grip strength (PwGSmax) test, and the maximum pinch grip strength (PnGSmax) test...
March 8, 2017: Journal of Stroke and Cerebrovascular Diseases: the Official Journal of National Stroke Association
https://www.readbyqxmd.com/read/28278474/exploiting-knowledge-composition-to-improve-real-life-hand-prosthetic-control
#15
Gauravkumar Patel, Markus Nowak, Claudio Castellini
In myoelectric prosthesis control, one of the hottest topics nowadays is enforcing simultaneous and proportional (s/p) control over several degrees of freedom. This problem is particularly hard and the scientific community has so far failed to provide a stable and reliable s/p control, effective in daily-life activities. In order to improve the reliability of this form of control, in this work we propose on-the-fly knowledge composition, thereby reducing the burden of matching several patterns at the same time, and simplifying the task of the system...
March 1, 2017: IEEE Transactions on Neural Systems and Rehabilitation Engineering
https://www.readbyqxmd.com/read/28275083/unilateral-cerebellothalamic-tract-ablation-in-essential-tremor-by-mri-guided-focused-ultrasound
#16
Sebastian R Schreglmann, Ronald Bauer, Stefan Hägele-Link, Kailash P Bhatia, Parashkev Natchev, Nikolas Wegener, Anita Lebeda, Beat Werner, Ernst Martin, Georg Kägi
OBJECTIVE: To report results of a prospective trial of unilateral transcranial MRI-guided focused ultrasound (MRIgFUS) ablation of the cerebellothalamic tract in essential tremor (ET). METHODS: This was a prospective, uncontrolled, single-center interventional study. Patients with ET fulfilling criteria for interventional therapy received unilateral ablation of the cerebellothalamic tract (CTT) by MRIgFUS. Motor symptoms, manual dexterity, cognition, and quality of life were assessed before intervention and at 48 hours and 1, 3, and 6 months after intervention...
March 8, 2017: Neurology
https://www.readbyqxmd.com/read/28269405/24-dof-emg-controlled-hybrid-actuated-prosthetic-hand
#17
A Atasoy, E Kaya, E Toptas, S Kuchimov, E Kaplanoglu, M Ozkan
A complete mechanical design concept of an electromyogram (EMG) controlled hybrid prosthetic hand, with 24 degree of freedom (DOF) anthropomorphic structure is presented. Brushless DC motors along with Shape Memory Alloy (SMA) actuators are used to achieve dexterous functionality. An 8 channel EMG is used for detecting 7 basic hand gestures for control purposes. The prosthetic hand will be integrated with the Neural Network (NNE) based controller in the next phase of the study.
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28269396/investigation-of-a-passive-capstan-based-grasp-enhancement-feature-in-a-voluntary-closing-prosthetic-terminal-device
#18
Kevin D Gemmell, Michael T Leddy, Joseph T Belter, Aaron M Dollar
Body-powered prosthetic terminal devices fall into two main categories: voluntary-closing devices, which require the user to exert a force to maintain a grasp, and voluntary opening devices, which generally utilize springs to close and maintain a force. As a result, voluntary-closing devices often have a locking feature that allows the user to relax and transport objects while maintaining a firm grip. In this paper, we examine a new type of capstan-based passive brake mechanism in a voluntary-closing prosthetic terminal device...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28269097/three-dimensional-modeling-of-physiological-tremor-for-hand-held-surgical-robotic-instruments
#19
Sivanagaraja Tatinati, Yan Naing Aye, Anand Pual, Wei Tech Ang, Kalyana C Veluvolu
Hand-held robotic instruments are developed to compensate physiological tremor in real-time while augmenting the required precision and dexterity into normal microsurgical work-flow. The hardware (sensors and actuators) and software (causal linear filters) employed for tremor identification and filtering introduces time-varying unknown phase-delay that adversely affects the device performance. The current techniques that focus on three-dimensions (3D) tip position control involves modeling and canceling the tremor in 3-axes (x, y, and z axes) separately...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
https://www.readbyqxmd.com/read/28268399/an-effective-3-fingered-augmenting-exoskeleton-for-the-human-hand
#20
C J Gearhart, B Varone, M H Stella, B F BuSha
Every year, thousands of Americans suffer from pathological and traumatic events that result in loss of dexterity and strength of the hand. Although many supportive devices have been designed to restore functional hand movement, most are very complex and expensive. The goal of this project was to design and implement a cost-effective, electrically powered exoskeleton for the human hand that could improve grasping strength. A 3-D printed thermoplastic exoskeleton that allowed independent and enhanced movement of the index, middle and ring fingers was constructed...
August 2016: Conference Proceedings: Annual International Conference of the IEEE Engineering in Medicine and Biology Society
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