Grip Test Research Articles

Development of a novel gripping test for the evaluation of the finger fine motor ability in MPTP-treated monkeys

Assessing the finger fine motor ability is extremely important. However, conventional behavioral tests in monkeys are complicated and costly. We attempted to develop a new task to assess the precise finger grip in Parkinson's disease monkeys based on the principles of objectification, multipurpose, and simplification. This study involved seven adult male cynomolgus monkeys. A gripping test based on the previous food reaching test was developed. Parallel experiments of food reaching test and gripping test affected by the treatments of levodopa and deep brain stimulation of the subthalamic nucleus were performed to verify the utility of the gripping test. We found that gross motor ability (measured by food reaching test) could be significantly improved by both the subthalamic nucleus and levodopa administration, which reproduced the results of our previous study. The finger fine motor ability (measured by the gripping test) could be significantly improved by levodopa administration, but not by the subthalamic nucleus. Our results verified the utility and reliability of the gripping test, which is a simple, convenient, and objective task for evaluating the finger fine motor skill in Parkinson's disease monkeys. Mechanisms of the efficacy of deep brain stimulation on fine motor ability require further investigation.

The effects of acute blood flow restriction on climbing-specific tests

The aim of the study was to compare climbing specific performance tests with and without blood flow restriction (BFR). Thirty one climbers (age 26.9 ± 5.5 years, height 177.2 ± 7.5 cm, weight 70.5 ± 8.3 kg, fat percentage 11.9 ± 4.1 %, climbing skill 18.9 ± 4.0 IRCRA scale) performed climbing specific grip tests measuring isometric strength (peak force, rate of force development and maximal voluntary contraction (and dynamic strength (power and peak velocity in pull-up) on a 23-mm campus rung. Further, an intermittent finger endurance (7 seconds work, 3 seconds rest at 60% of maximal voluntary contraction) test to failure was conducted. All tests were performed on two separate occasions (separated by 2–5 days) with and without blood flow restriction (200 mmHg) in a randomized order. The results demonstrated no differences in the isometric strength tests (p = 0.496–0.850, ES = 0.060–0.170), dynamic strength test (p = 0.226–0.442, ES = 0.200–0.330) or the intermittent finger endurance test (p = 0.563, ES = 0.160). In conclusion, no differences were observed in the maximal isometric pull-up test, dynamic pull-up test or finger endurance tests including measurements as peak force, MVC, RFD, power output, peak velocity or time to fatigue at 60% of MVC with and without BFR.

Generic gripper for an unmanned aerial vehicle

Abstract Research has been performed on the use of a robotic hand to be used as a UAV gripper and the contributions it would make to implement such a product with a UAV. An overview was performed on UAV grippers available for purchase to determine what contributions would be of greatest need from a newly developed UAV gripper. It was found that there is a lack of grippers capable of gripping objects of a variety of shapes. Design features of the mechanical system and control system of the robotic hand that provides functionality of a UAV gripper which is designed to grip objects of various sizes was then discussed. The robotic hand was tested on performing grips on objects of various shapes and sizes to determine its versatility as a gripper and was shown to be used on all the objects tested. Grip tests performed by the robotic hand to evaluate its functionality showed that the robotic hand was capable of lifting 30.4 N if an object is hooked onto it.

Anti-fatigue Effect of Anwulignan on Aging Mice

Objective:To observe the anti-fatigue effect of Anwulignan(AN) on D-galactose-induced aging mice. Methods:ICR male mice were randomly divided into four groups,named the blank control group(CON),the model group(MOD),low-dose group(AN,1 mg/kg),and high-dose group(AN,4 mg/kg).After 30 min of administration of Anwulignan or solvent,each group was injected subcutaneously of normal saline or D-galactose,once a day for 6 weeks. By using fatigue rotation bar test and forelimb grip test,exercise endurance of aging mice was observed,the urea nitrogen,lactic acid,lactate dehydrogenase,creatine kinase,and superoxidase in skeletal muscle tissue,and malondialdehyde levels were detected by chemical chemical chromatometry. Results:Compared with the MOD group,the low-dose AN group and the high-dose AN group prolonged the rod rotation time of mice by 37% and 67%(P<0.05),and 55%(P<0.05) and 89%(P<0.01) of forelimb grip value.The grip strength of the forelimbs of mice showed that the exercise endurance of mice treated with different doses of AN significantly increased(P<0.05 or P<0.01).At the same time,the oxidation and fatigue indicators showed that high-dose AN,the effect of the lower dose AN group was more significant. The oxidation parameter contents of superoxide enzyme increased by 38%(P<0.01),and the content of malondialdehyde decreased by 14%(P<0.05). The fatigue parameter indicators decreased the levels of serum urea nitrogen and lactic acid by 15%(P<0.05)) and 21%(P<0.05),lactate dehydrogenase and creatine kinase activity were reduced by 22%(P<0.01) and 12%(P<0.05).Conclusion:AN had anti-fatigue effect in aging mice induced by D-galactose.This study would provide a experimental basis for the further development of anti-aging and anti-fatigue drugs and health foods.

Assessment of Physical Fitness and Its Association with Sympathetic Activation Among the Students of Pokhara University, Nepal

A 3-minute step test provides a feasible, low cost procedure with minimal risk to the participant for assessing physical fitness compared to maximal exercise testing. Test assessing the autonomic function (sympathetic wing) evaluates the cardiovascular reflex like increased blood pressure triggered by performing specific stimulating maneuvers such as Isometric Hand Grip Test (IHGT). We assessed & categorized the fitness level using a 3 min step test and its association with sympathetic activation during IHGT in university level students with sound health. There is increasing evidence of an association between Physical Fitness and academic performance. Two hundred consenting healthy students studying at Pokhara University (largest in western region of Nepal) aged 17-25 years underwent sub-maximal exercise as per the protocol of 3 min-step test given by Young Man’s Christian Associations (YMCA) to categorize as good & poor being based on recovery heart rate. Each groups undertook IHGT & changes in Diastolic Blood Pressure (DBP) were noted. About two third of the study participants were female and 70% of total students were of poor fitness level. Fitness level and sex was significantly associated (P=0.041, OR=1.92, CI=1.024- 3.606). More of the male participants had good fitness in comparison to that of the female participants (38.9% vs 24.8%). Differences in Diastolic Blood Pressure during IHGT and at rest (assess sympathetic activation during stress) was significantly associated with fitness level (P<0.001, OR=1.32, CI=1.201-1.446). Majority of university level students had poor fitness with high proportion in female. Students with good fitness level had good sympathetic activation to physical stress as compared to those with poor fitness level. Physical fitness (Cardiorespiratory fitness) is proven to induce angiogenesis in the motor cortex and increases blood flow, improving brain vascularization which could affect cognitive performance. So measuring physical fitness of university students at the time of admission or during the study period could help to predict their academic achievements through their reasoning function and ability of coping various stresses that they might encounter during academic journey. Those with poor physical fitness would be advised to improve the fitness by promoting physical activity.

Assessment of gender differences in autonomic nervous control of the cardiovascular system.

To determine the differences in the control of the cardiovascular system by the autonomic nervous system between young males and females.. The cross-sectional study was conducted at the Khyber Medical College, Peshawar, Pakistan, from June 2017 to April 2018, and comprised physically healthy medical students of both genders studying in first and second year of their academic studies. The subjects were made to perform the hand grip test and the Valsalva manoeuvre. Their electrocardiogram was recorded during and after the Valsalva manoeuvre. Blood pressure and heart rate were monitored before, during and after both the manoeuvres. Parasympathetic activity was assessed by calculating the Valsalva ratio. Sympathetic activity was measured by observing the increase in diastolic blood pressure during hand grip manoeuvre, and decrease in systolic blood pressure during the Valsalva manoeuvre. Data was analysed using SPSS 20. Of the 140 subjects, 70(50%) each were males and females. There was no significant difference between the parasympathetic system and sympathetic system working of the two genders (p>0.05). There was significant difference between the two groups in sympathetic system when checked on the basis of the hand grip test (p<0.05). Sympathetic system was found to be acting more efficiently in young males compared to their female counterparts.

Evaluation of Underwater Cable Burying ROV through Sea Trial at East Sea

Underwater cable burying is one of main cable protection methods in the offshore cable installation. In this paper, the performance evaluation of an underwater cable burying robot, named URI-T, through the sea trial is addressed. URI-T, the first heavy-duty underwater robot for cable burying tasks developed in South Korea, is designed to perform burying tasks and maintenance tasks for underwater cables and small-size pipes at the sea bed of 2,500m water depth. URI-T includes water-jetting systems and cable detection sensors for cable burying tasks, and employes mainpulators and tools for cable maintenance tasks. The sea trial at the East Sea having 500m water depth was focused to verify the key performance indices: operation water depth, cable burying depth, cable burying speed, and forward speed. The cable maintenance ability was also examined by carrying out the cable cutting test and the cable gripping test. Moreover, applicability of URI-T is also evaluated by two times of cable burying experiments more than 100m distance. As a result, it was verified not only that URI-T satisfies the target performance indicies, but also that URI-T is applicable for the cable burying construction.

Pentraxin 3 contributes to neurogenesis after traumatic brain injury in mice.

Emerging evidence indicates that pentraxin 3 is an acute-phase protein that is linked with the immune response to inflammation. It is also a newly discovered marker of anti-inflammatory A2 reactive astrocytes, and potentially has multiple protective effects in stroke; however, its role in the adult brain after traumatic brain injury is unknown. In the present study, a moderate model of traumatic brain injury in mice was established using controlled cortical impact. The models were intraventricularly injected with recombinant pentraxin 3 (the recombinant pentraxin 3 group) or an equal volume of vehicle (the control group). The sham-operated mice underwent craniotomy, but did not undergo the controlled cortical impact. The potential neuroprotective and neuroregenerative roles of pentraxin 3 were investigated on days 14 and 21 after traumatic brain injury. Western blot assay showed that the expression of endogenous pentraxin 3 was increased after traumatic brain injury in mice. Furthermore, the neurological severity test and wire grip test revealed that recombinant pentraxin 3 treatment reduced the neurological severity score and increased the wire grip score, suggesting an improved recovery of sensory-motor functions. The Morris water maze results demonstrated that recombinant pentraxin 3 treatment reduced the latency to the platform, increased the time spent in the correct quadrant, and increased the number of times traveled across the platform, thus suggesting an improved recovery of cognitive function. In addition, to investigate the effects of pentraxin 3 on astrocytes, specific markers of A2 astrocytes were detected in primary astrocyte cultures in vitro using western blot assay. The results demonstrated that pentraxin 3 administration activates A2 astrocytes. To explore the protective mechanisms of pentraxin 3, immunofluorescence staining was used. Intraventricular injection of recombinant pentraxin 3 increased neuronal maintenance in the peri-injured cortex and ipsilateral hippocampus, increased the number of doublecortin-positive neural progenitor cells in the subventricular and subgranular zones, and increased the number of bromodeoxyuridine (proliferation) and neuronal nuclear antigen (mature neuron) double-labeled cells in the hippocampus and peri-injured cortex. Pentraxin 3 administration also increased the number of neurospheres and the number of bromodeoxyuridine and doublecortin double-labeled cells in neurospheres, and enhanced the proliferation of neural progenitor cells in primary neural progenitor cell cultures in vitro. In conclusion, recombinant pentraxin 3 administration activated A2 astrocytes, and consequently improved the recovery of neural function by increasing neuronal survival and enhancing neurogenesis. All experiments were approved by the Animal Ethics Committee of the First Affiliated Hospital of Chongqing Medical University, China on March 1, 2016.

Astragaloside IV reverses simvastatin-induced skeletal muscle injury by activating the AMPK-PGC-1α signalling pathway.

In this study, we investigated the effect of astragaloside IV on skeletal muscle energy metabolism disorder caused by statins and explored the possible mechanisms. High-fat diet-fed apolipoprotein E knockout (ApoE-/- ) mice performed aerobic exercise and were administered simvastatin, simvastatin + trimetazidine, or simvastatin + astragaloside IV by gavage. At the end of treatment, exercise performance was assessed by the hanging grid test, forelimb grip test, and running tolerance test. Moreover, plasma lipid and creatine kinase concentrations were measured. After sacrifice, the gastrocnemius muscle was used to assess muscle morphology, and energy metabolism was evaluated by determining the concentration of lactic acid and the storage capacity of adenosine triphosphate and glycogen. Mitochondrial function was assessed by measuring mitochondrial complex III and citrate synthase activity and membrane potential. In addition, oxidative stress was assessed by determining the level of hydrogen peroxide. Finally, using western blotting and reverse transcription polymerase chain reaction, we explored the mechanism of astragaloside IV in alleviating simvastatin-induced muscle injury. Our results demonstrated that astragaloside IV reversed simvastatin-induced muscle injury without affecting the lipid-lowering effect of simvastatin. Moreover, astragaloside IV promoted the phosphorylation of AMPK and activated PGC-1α, which upregulated the expression of NRF1 to enhance energy metabolism and inhibit skeletal muscle cell apoptosis.

Modified behavioural tests to detect white matter injury- induced motor deficits after intracerebral haemorrhage in mice

Motor function deficit induced by white matter injury (WMI) is one of the most severe complications of intracerebral haemorrhage (ICH). The degree of WMI is closely related to the prognosis of patients after ICH. However, the current behavioural assessment of motor function used in the ICH mouse model is mainly based on that for ischaemic stroke and lacks the behavioural methods that accurately respond to WMI. Here, a series of easy-to-implement behavioural tests were performed to detect motor deficits in mice after ICH. The results showed that the grip strength test and the modified pole test not only can better distinguish the degree of motor dysfunction between different volumes of blood ICH models than the Basso Mouse Scale and the beam walking test but can also accurately reflect the severity of WMI characterized by demyelination, axonal swelling and the latency of motor-evoked potential delay induced by ICH. In addition, after ICH, the results of grip tests and modified pole tests, rather than the Basso Mouse Scale and the beam walking test, were worse than those observed after intraventricular haemorrhage (IVH), which was used as a model of brain haemorrhage in non-white matter areas. These results indicate that the grip strength test and the modified pole test have advantages in detecting the degree of motor deficit induced by white matter injury after ICH in mice.

Glimepiride and glibenclamide have comparable efficacy in treating acute ischemic stroke in mice

Glibenclamide protects against ischemic injury in both preclinical and clinical studies, presumably by blocking the de novo assembled sulfonylurea receptor 1-transient receptor potential M4 (Sur1-Trpm4) channel induced by ischemia. However, glibenclamide may cause unexpected serious hypoglycemia. Here, we tested whether glimepiride, another sulfonylurea with better safety, has comparable efficacy with glibenclamide and whether gene deletion of Trpm4 (Trpm4−/−) exerts similar effect. Wild-type (WT) mice subjected to temporary middle cerebral artery occlusion (tMCAO) were randomized to receive glibenclamide (an initial dose of 10 μg/kg and additional doses of 1.2 μg every 8 h), three different doses of glimepiride (10 μg/kg, 100 μg/kg and 1 mg/kg) or vehicle after ischemia, while tMCAO-treated Trpm4−/− mice were randomized to receive vehicle or glimepiride. Neurological function, infarct volume, edema formation, the integrity of blood-brain barrier and inflammatory reaction were evaluated at 24 h after ischemia. In tMCAO-treated WT mice, 10 μg/kg and 100 μg/kg glimepiride had comparable efficacy with glibenclamide in improving longa score and grip test score, reducing infarct volume, mitigating brain edema, lessening extravasation of Evans blue dye and IgG, restoring tight junction protein expression as well as suppressing inflammatory cytokines. Compared with WT mice, Trpm4−/− mice showed less neurological deficit, smaller cerebral infarction, lighter brain edema and more integrity of blood-brain barrier. As expected, glimepiride did not provide additional neuroprotection compared with vehicle in the tMCAO-treated Trpm4−/− mice. Glimepiride shows comparable efficacy with glibenclamide in alleviating brain injury after ischemic stroke in mice, possibly via targeting the Sur1-Trpm4 channel.

Comparison of experimental procedures of a method for continuous friction measurement in airport pavements

This paper describes a comparison performed between two experimental procedures (with the Grip Tester and the Continuous Friction Measurement Equipment) of the fixed-slip method for longitudinal continuous friction measurement in airport pavements. The measurement framework is described, namely, the experimental testing and the related conformity assessment procedure supported by different friction thresholds. The experimental results of the comparison are presented (raw data, differences between friction estimates and corresponding experimental probability distributions) and its impact on the conformity assessment result is discussed. Conclusions are drawn based on the obtained difference dispersion, instrumental measurement uncertainties and expected difference between the two experimental procedures.

Postoperative Resolution of MR T2 Increased Signal Intensity in Cervical Spondylotic Myelopathy: The Impact of Signal Change Resolution on the Outcomes.

A prospective comparative imaging study. This study investigated whether postoperative resolution of spinal cord increased signal intensity (ISI) reflected symptom improvement and surgical outcomes in cervical spondylotic myelopathy (CSM) patients. Although some CSM patients exhibit magnetic resonance imaging (MRI) ISI, its alteration and resolution have not been investigated. The association between postoperative ISI resolution and surgical outcomes in CSM patients remains controversial. A total of 505 consecutive CSM patients (311 males; 194 females) aged a mean of 66.6 years (range, 41-91) were enrolled. All were treated with laminoplasty and underwent MRI scans preoperatively and after an average of 26.5 months postoperatively (range 12-66 months). ISI was classified pre- and postoperatively based on sagittal T2-weighted magnetic resonance images into Grade 0, none; Grade 1, light (obscure); and Grade 2, intense (bright). The patients' pre- and postoperative neurological statuses were evaluated using the Japanese Orthopedic Association scoring system for cervical myelopathy [Japanese Orthopedic Association (JOA) score] and other quantifiable tests, including the 10-s grip and release (10-s G&R) test and 10-s step test. A total of 337 patients showed preoperative ISI. Among these, 42 (12.5%) showed postoperative ISI resolution, associated with better postoperative JOA score and recovery rate, 10-s G&R and 10-s step test scores than those who retained it. Patients with preoperative Grade 2 ISI had no postoperative ISI resolution. Patients with ISI improvement from Grade 1 to Grade 0 had better outcomes than those with ISI worsening from Grade 1 to Grade 2. Postoperative ISI resolution in CSM patients reflects postoperative symptoms and surgical outcomes. Patients who exhibit ISI resolution have better clinical outcomes. 3.

Effects of precondition α2-adrenoceptor agents on memory- and anxiety-related processes in the transient cerebral ischemic rats.

Neurological evidence for the neuroprotective function of α2-adrenoceptors in the cerebral ischemia is inconsistent. It is not examined how pretreatment with a single dose of α2-adrenoceptor agents can affect motor function and anxiety- and memory-related responses in the cerebral ischemic animals. The transient forebrain ischemia model was provided, using a bilateral common carotid arterial occlusion (two-vessel occlusion, 2VO) in male Wistar rats. The 2VO rats impaired motor functions in the Rota-rod and wire grip tests and also decreased the step-through latency and the percentage of time spent on the open arms (%OAT), the percentage of entries into the open arms (%OAE) as well as locomotion in the elevated plus maze (EPM), indicating a memory deficit and anxiety-like behavior. Intraperitoneal single administration of yohimbine (0, 0.001, 0.01, and 0.1mg/kg) before the 2VO did not alter these parameters while the higher and middle doses of clonidine (0.01 and 0.1mg/kg) prevented the memory deficit and hypo-locomotion and its middle dose abrogated Rota-rod dysfunction and anxiety-like response. Meanwhile, both drugs did not influence on the measured behaviors in the sham groups by themselves. Moreover, yohimbine (0.001mg/kg) abolished the beneficial effects of clonidine (0.01 and 0.1mg/kg) on motor function in the Rota-rod and memory retention and also at its middle dose on the %OAT and locomotion in the 2VO rats. Our findings show a neuroprotective role for clonidine in motor function and memory- and anxiety-related behaviors of 2VO rats and the importance of α2-adrenoceptors in these processes.

Immune Responses and Anti-inflammatory Strategies in a Clinically Relevant Model of Thromboembolic Ischemic Stroke with Reperfusion.

The poor clinical relevance of experimental models of stroke contributes to the translational failure between preclinical and clinical studies testing anti-inflammatory molecules for ischemic stroke. Here, we (i) describe the time course of inflammatory responses triggered by a thromboembolic model of ischemic stroke and (ii) we examine the efficacy of two clinically tested anti-inflammatory drugs: Minocycline or anti-CD49d antibodies (tested in stroke patients as Natalizumab) administered early (1h) or late (48h) after stroke onset. Radiological (lesion volume) and neurological (grip test) outcomes were evaluated at 24h and 5days after stroke. Immune cell responses peaked 48h after stroke onset. Myeloid cells (microglia/macrophages, dendritic cells, and neutrophils) were already increased 24h after stroke onset, peaked at 48h, and remained increased-although to a lesser extent-5days after stroke onset. CD8+ and CD4+ T-lymphocytes infiltrated the ipsilateral hemisphere later on (only from 48h). These responses occurred together with a progressive blood-brain barrier leakage at the lesion site, starting 24h after stroke onset. Lesion volume was maximal 24-48h after stroke onset. Minocycline reduced both lesion volume and neurological deficit only when administered early after stroke onset. The blockade of leukocyte infiltration by anti-CD49d had no impact on lesion volume or long-term neurological deficit, independently of the timing of treatment. Our data are in accordance with the results of previous clinical reports on the use of Minocycline and Natalizumab on ischemic stroke. We thus propose the use of this clinically relevant model of thromboembolic stroke with recanalization for future testing of anti-inflammatory strategies for stroke.

Validity and Reliability of Neurological Scores in Mice Exposed to Middle Cerebral Artery Occlusion.

Background and Purpose- The selection of appropriate neurological scores and tests is crucial for the evaluation of stroke consequences. The validity and reliability of neurological deficit scores and tests has repeatedly been questioned in ischemic stroke models in the past. Methods- In 198 male mice exposed to transient intraluminal middle cerebral artery occlusion, we examined the validity and reliability of 11 neurological scores (Bederson score 0-3, Bederson score 0-4, Bederson score 0-5, modified neurological severity [0-14], subjective overall impression [0-10], or simple neurological tests: grip test, latency to move body length test, pole test, wire hanging test, negative geotaxis test, and elevated body swing test) in the acute stroke phase, that is, after 24 hours. Combinations of neurological scores or tests for predicting infarct volume were statistically analyzed. Results- Infarct volume was left skewed (median [Q1-Q3], 78.4 [54.8-101.3] mm3). Among all tests, the Bederson (0-5; r=0.63, P<0.001), modified neurological severity (r=0.80, P<0.001), and subjective overall impression (r=-0.63, P<0.001) scores had the highest test validities, using infarct volume as external reference. Subjective overall impression had the best agreement between 5 raters (Kendall W=0.11, P<0.001). The Bederson (0-5) score discriminated infarct volume in mice with small (≤50 mm3; r=0.33, P=0.027) and large (>50 mm3; r=0.48, P<0.001) brain infarcts, all other tests only in mice with large infarcts. Combining subjective overall impression with Bederson (0-5) score explained 47.6% of the variance of infarct volume. Conclusions- Despite their simplicity, the Bederson (0-5) score, modified neurological severity score, and subjective overall impression have reasonable validity and reliability in the acute stroke phase. The Bederson (0-5) score equally distinguishes infarct volume in small and large infarcts. Visual Overview- An online visual overview is available for this article.

Home rehabilitation supported by a wearable soft-robotic device for improving hand function in older adults: A pilot randomized controlled trial.

BackgroundNew developments, based on the concept of wearable soft-robotic devices, make it possible to support impaired hand function during the performance of daily activities and intensive task-specific training. The wearable soft-robotic ironHand glove is such a system that supports grip strength during the performance of daily activities and hand training exercises at home.DesignThis pilot randomized controlled clinical study explored the effect of prolonged use of the assistive ironHand glove during daily activities at home, in comparison to its use as a trainings tool at home, on functional performance of the hand.MethodsIn total, 91 older adults with self-perceived decline of hand function participated in this study. They were randomly assigned to a 4-weeks intervention of either assistive or therapeutic ironHand use, or control group (received no additional exercise or treatment). All participants performed a maximal pinch grip test, Box and Blocks test (BBT), Jebsen-Taylor Hand Function Test (JTHFT) at baseline and after 4-weeks of intervention. Only participants of the assistive and therapeutic group completed the System Usability Scale (SUS) after the intervention period.ResultsParticipants of the assistive and therapeutic group reported high scores on the SUS (mean = 73, SEM = 2). The therapeutic group showed improvements in unsupported handgrip strength (mean Δ = 3) and pinch strength (mean Δ = 0.5) after 4 weeks of ironHand use (p≤0.039). Scores on the BBT and JTHFT improved not only after 4 weeks of ironHand use (assistive and therapeutic), but also in the control group. Only handgrip strength improved more in the therapeutic group compared to the assistive and control group. No significant correlations were found between changes in performance and assistive or therapeutic ironHand use (p≥0.062).ConclusionThis study showed that support of the wearable soft-robotic ironHand system either as assistive device or as training tool may be a promising way to counter functional hand function decline associated with ageing.

Feasibility and Reliability of a Physical Fitness Test Battery in Individuals with Down Syndrome.

Background: Down syndrome (DS) is a genetic disorder that occurs because of an abnormal division between cells that results in an extra copy of chromosome 21. Some studies show that physical exercise in people with DS increases some cognitive capacities, such as memory, and improves the quality of life. Aim: The main aim of this study was to perform an analysis of the reliability and feasibility of the SAMU-Disability Fitness (DISFIT) battery in adults with DS. Methods: A cross-sectional study with a test–retest design was performed in a maximum interval of 2 weeks in 37 subjects (11 women and 26 men) aged between 21 and 58 years old with DS. Eight field-based fitness tests were proposed to assess the physical fitness (PF) of adults with DS: Body Mass Index (BMI), Waist Circumference (WC), the Timed Up and Go test (TUG), the Deep Trunk Flexibility test (DTF), the Hand Grip test (HG), the Timed Stand Test (TST), the 30-s Sit-Up (SUP) and the 6-Min Walk Test (6MWT). Results: The intra-class correlation coefficient (ICC) in all the tests was good and high (>0.80), except for the 6MWT, whose reliability was fair. Conclusion: The SAMU-DISFIT battery is a reliable and feasible physical fitness battery which has been created with the purpose of establishing tests which measure the four basic components of PF (flexibility, cardiorespiratory fitness, musculoskeletal fitness and motor fitness) in adults with DS.

Vibration induced injuries in hands in long-term vibration exposed workers

IntroductionLong-term vibration exposure may cause neurophysiological disturbances such as numbness and tingling, reduced grip strength and difficulties in handling small objects. The dominant hand will usually have a higher vibration exposure than the non-dominant hand, which may cause more severe neurological symptoms and signs in the dominant hand.MethodsThe study is based on 47 (36 males and 11 females) vibration exposed workers, all former patients from the department of Occupational and Environmental medicine, Gothenburg university. The comparison group consisted of 18 randomly selected subjects from the general population of Gothenburg. All participants completed several questionnaires and had a standardized medical examination. Thereafter, neurophysiological tests such as the determination of vibration and thermal perception thresholds were performed, as well as muscle strength tests in hands and fingers.ResultsThe temperature perception thresholds (TPTs) and the vibration perception thresholds (VPTs) did not differ significantly between the dominant and non-dominant hand in vibration exposed workers. The referents showed a significantly better performance (p ≤ 0.02 and p ≤ 0.034, respectively) than the workers for both TPTs and VPTs, indicating a negative effect on the Aß, as well as on the Aδ and C-fibers among the exposed workers.The Purdue Pegboard test showed a significantly better performance in the dominant vs non-dominant hand in both workers (p = 0.001) and referents (p = 0.033). The referents showed a better performance than the workers in both hands (p < 0.001). The Baseline handgrip, the Pinch grip and 3-Chuck grip tests did not differ significantly between the dominant and non-dominant hand in neither workers nor referents.ConclusionsIn this study, minor differences between the dominant and non-dominant hand were noted for the Purdue Pegboard test in both workers and referents. Despite a probably higher vibration exposure in the dominant hand (mostly the right hand), however, quite similar test results were noted for VPTs, TPTs, Baseline handgrip, Pinch grip and 3-Chuck grip when comparing the dominant and non-dominant hand in the vibration exposed workers. In case of lack of time and financial obstacles, neurological tests in solely the dominant hand, will probably satisfactory reflect the conditions in the non-dominant hand.

Obstructive sleep apnea syndrome and autonomic dysfunction.

Autonomic nervous system (ANS) has been extensively explored in obstructive sleep apnea (OSA). Autonomic alterations in these patients have been described by means of several methods, evaluating ANS function both directly with microneurography and indirectly through baroreflex sensitivity (BRS, by the sequence method or the cross-spectral approach), heart rate variability analysis (HRV, both in the time and frequency domain) during sleep and wake, or conventional laboratory tests, including cold pressor test, hand grip test or measurement of urinary cathecolamine excretion. Several studies in OSA patients have shown ANS alterations, in particular sympathetic overactivity, both acutely during apnea events and chronically during the daytime, being both also involved in cardiovascular consequences of sleep disordered breathing. The association between OSA and sympathetic dysregulation suggests a dose response relationship between OSA severity and the degree of sympathetic overactivity and this association seems to be reversible as the treatment of OSA is implemented. Additionally ANS is involved in regulating visceral and humoral functions to maintain the body homeostasis and in reaction and adaptation to external and internal stressor stimuli. However, the vast majority of studies have focussed on cardiovascular alterations, which are easier to measure, somewhat neglecting the other functions regulated by ANS. More evidence is therefore needed to better characterize the impact that sleep disorder breathing may have on ANS both in the short and long term.