Impact of different centroid means on the accuracy of orthometric height modelling by geometric geoid method

Background:Orthometric height, as well as geoid modelling using the geometric method, requires centroid computation. And this can be obtained using various models, as well as methods. These methods of centroid mean computation have impacts on the accuracy of the geoid model since the basis of the development of the theory of each centroid mean type is different. This paper presents the impact of different centroidmeans on the accuracy of orthometric height modelling by geometric geoid method.Methods:DGPS observation was carried out to obtain the coordinates and ellipsoidal heights of selected points. The centroid means were computed with the coordinates using three different centroid means models (arithmetic mean, root mean square and harmonic mean). The computed centroid means were entered accordingly into a Microsoft Excel program developed using the Multiquadratic surface to obtain the model orthometric heights at various centroid means. The root meanssquare error (RMSE) index was applied to obtain the accuracy of the model using the known and the model orthometric heights obtained at various centroid means.Results:The computed accuracy shows that the arithmetic mean method is the best among the three centroid means types.Conclusions:It is concluded that the arithmetic mean method should be adopted for centroid computation, as well as orthometric height modelling using the geometric method

Comfort optimization of a new type of foot mechanism for lower extremity exoskeleton / 生物医学工程学杂志

In order to reduce the impact caused by the contact between the foot and the ground when wearing the lower extremity exoskeleton under the condition of high load, this paper proposed an exoskeleton foot mechanism for improving the foot comfort, and optimized the key index of its influence on the comfort. Firstly, the physical model of foot mechanism was established based on the characteristics of foot stress in gait period, and then the mathematical model of vibration was abstracted. The correctness of the model was verified by the finite element analysis software ANSYS. Then, this paper analyzed the influence of vibration parameters on absolute transmissibility based on vibration mathematical model, and optimized vibration parameters with MATLAB genetic algorithm toolbox. Finally, this paper took white noise to simulate the road elevation as the vibration input, and used the visual simulation tool Simulink in MATLAB and the vibration equation to construct the acceleration simulation model, and then calculated the vibration weighted root mean square acceleration value of the foot. The results of this study show that this foot comfort mechanism can meet the comfort indexes of vibration absorption and plantar pressure, and this paper provides a relatively complete method for the design of exoskeleton foot mechanism, which has reference significance for the design of other exoskeleton foot and ankle joint rehabilitation mechanism.

Biomechanical characteristics on ball games for male youth with different body mass index based on anybody simulation and electromyogram test / 中国组织工程研究

BACKGROUND: Anybody’s musculoskeletal modeling system simulates the relationship between human skeleton, muscle and environment by using mathematical modeling technology. It can study the reverse dynamics of human body and obtain the maximum muscle strength of three lower limb joints. OBJECTIVE: To study the lower extremity muscle strength values of 24 male college students with different body mass indexes in one cycle of sitting Swiss ball, and to compare the mean root-mean-square of the subjects in sitting Swiss ball and bench. METHODS: Twenty-four male college students were divided into normal group, overweight group and obesity group according to body mass index. BTS 3D infrared motion capture system, Kistler 3D dynamometer and BTS surface electromyography system were used to record the dynamic and electromyographic parameters simultaneously. The differences in muscle force and electromyographic parameters between different groups were qualitatively compared by one-way analysis of variance, and the mean differences were compared by quantitative difference analysis. RESULTS AND CONCLUSION:(1) In terms of muscle strength, from sitting to standing, compared with the obese group, the normal group showed significant differences in rectus femoris, semimememial muscle, biceps femoris longhead, popliteal muscle, soleus muscle and tibial anterior muscle (P < 0.05, 0.47 ≤ QD < 0.80), and the quadratus femoris muscle and pectineus muscle showed significant differences (P < 0.01, QD ≥ 0.80). There was a significant difference in muscle strength of quadratus femoris between the obese group and the overweight group (P < 0.05, 0.47 ≤ QD < 0.80). From standing to sitting, there were significant differences in muscle strength of sartorus, extensor pollicis, and gastrocneum between the normal group and the obese group (P< 0.05, 0.47 ≤ QD < 0.80). (2) In terms of root-mean-square electromyogram value, from sitting to standing, the biceps femoris and gastrocnastus muscles in the normal group were significantly different from those in the obese group (P < 0.05, 0.47 ≤  QD < 0.80); from standing to sitting, rectus femoris muscles in the normal group were significantly different from those in the obese group (P < 0.05,  0.47 ≤ QD < 0.80). In the Swiss ball sitting state, from sitting to standing, the tibial anterior muscle and biceps femoris were significantly different between the normal group and the obese group (P < 0.05, 0.47 ≤ QD < 0.80). From standing to sitting, the electromyogram values of gastrocnemius muscle and right erector spine muscle were significantly different between the normal group and the obese group (P < 0.05, 0.47 ≤ QD < 0.80). These findings indicated that (1) In each group of BMI, the dominant muscle generation from sitting to sitting was gluteus medius muscle, vastus lateralis muscle, biceps longus muscle, rectus femoris muscle, gastrocnemius muscle, tibia anterior muscle and soleus muscle; and from standing to sitting, gluteus medius muscle, vastus lateralis muscle, biceps longus muscle, gastrocnemius muscle, tibia anterior muscle and soleus muscle. (2) Compared with the sitting stool, the subjects had higher root-mean-square of tibial anterior muscle, rectus femoris muscle, biceps femoris muscle and gastrocnemius muscle when sitting Swiss ball.

Simultaneous monitoring of motion ECG of two subjects using Bluetooth Piconet and baseline drift

Uninterrupted monitoring of multiple subjects is required for mass causality events, in hospital environment or for sports by medical technicians or physicians. Movement of subjects under monitoring requires such system to be wireless, sometimes demands multiple transmitters and a receiver as a base station and monitored parameter must not be corrupted by any noise before further diagnosis. A Bluetooth Piconet network is visualized, where each subject carries a Bluetooth transmitter module that acquires vital sign continuously and relays to Bluetooth enabled device where, further signal processing is done. In this paper, a wireless network is realized to capture ECG of two subjects performing different activities like cycling, jogging, staircase climbing at 100 Hz frequency using prototyped Bluetooth module. The paper demonstrates removal of baseline drift using Fast Fourier Transform and Inverse Fast Fourier Transform and removal of high frequency noise using moving average and S-Golay algorithm. Experimental results highlight the efficacy of the proposed work to monitor any vital sign parameters of multiple subjects simultaneously. The importance of removing baseline drift before high frequency noise removal is shown using experimental results. It is possible to use Bluetooth Piconet frame work to capture ECG simultaneously for more than two subjects. For the applications where there will be larger body movement, baseline drift removal is a major concern and hence along with wireless transmission issues, baseline drift removal before high frequency noise removal is necessary for further feature extraction.

Pharyngeal Swallowing Function in Elderly Patients with Asymptomatic Lacunar Infarction:Surface Electromy-ography Study / 中国康复理论与实践

Objective To observe the surface electromyography (sEMG) characteristics of pharyngeal swallowing muscles in different swallowing modes in asymptomatic lacunar infarction (LI) patients. Methods From January, 2015 to January, 2017, a total of 32 asymptom-atic LI patients (LI group) aged over 60 years were consecutively collected, and 30 normal old subjects matched with age and gender (nor-mal group) were also enrolled. The amplitudes of sEMG activity of infrahyoid muscles and submental muscles in different swallowing modes were recorded, and the root mean square (RMS) was analyzed. Results Significant difference was found in both muscle groups in dif-ferent swallowing modes in both groups (F>110.67, P0.05). In the 20 ml water swallowing mode, the RMS was lower in the submental muscles in the LI group than in the normal group (t=3.334, P0.05). In the 100 ml continuous drinking mode, the RMSs were significantly lower in both two muscle groups in LI group than in the normal group (t>3.118, P<0.01). Conclusion Swallow abilities decrease in asymptomatic LI. sEMG could be used to evaluate their swallowing function.

Deletion of a dynamic surface loop improves thermostability of (R)-selective amine transaminase from Aspergillus terreus / 生物工程学报

Chiral amines are important building blocks for the synthesis of pharmaceutical products and fine chemicals. Highly stereoselective synthesis of chiral amines compounds through asymmetric amination has attracted more and more attention. ω-transaminases (ω-TAs) are a promising class of natural biocatalysts which provide an efficient and environment-friendly access to production of chiral amines with stringent enantioselectivity and excellent catalytic efficiency. Compared with (S)-ω-TA, the research focused on (R)-ω-TA was relatively less. However, increasing demand for chiral (R)-amines as pharmaceutical intermediates has rendered industrial applications of (R)-ω-TA more attractive. Improving the thermostability of (R)-ω-TA with potential biotechnological application will facilitate the preparation of chiral amines. In this study, the dynamic surface loop with higher B-factor from Aspergillus terreus (R)-ω-TA was predicted by two computer softwares (PyMOL and YASARA). Then mutant enzymes were obtained by deleting amino acid residues of a dynamic surface loop using site-directed mutagenesis. The results showed that the best two mutants R131del and P132-E133del improved thermostability by 2.6 ℃ and 0.9 ℃ in T₅₀¹⁰ (41.1 ℃ and 39.4 ℃, respectively), and 2.2-fold and 1.5-fold in half-life (t1/2) at 40 ℃ (15.0 min and 10.0 min, respectively), compared to that of wild type. Furtherly, the thermostability mechanism of the mutant enzymes was investigated by molecular dynamics (MD) simulation and intermolecular interaction analysis. R131del in the loop region has lower root mean square fluctuation (RMSF) than the wild type at 400 K for 10 ns, and mutant enzyme P132-E133del increases four hydrogen bonds in the loop region. In this study, we obtain two stability-increased mutants of (R)-ω-TA from A. terreus by deleting its dynamic surface loop and also provide methodological guidance for the use of rational design to enhance the thermal stability of other enzymes.

Surface Electromyography Studies of Pharyngeal Swallowing in Healthy Middle-aged and Old People / 中国康复理论与实践

Objective To observe the character of amplitude of myoelectric activity with surface electromyography (sEMG) on pharyn-geal swallowing in healthy middle-aged and elderly people. Methods From January, 2015 to January, 2016, 78 healthy subjects were separat-ed into middle-aged group (38~60 years old, n=38) and elderly group (61~82 years old, n=40). The amplitudes of sEMG activity of related muscles under different swallowing modes were recorded by sEMG technique and analysis system. The root mean square (RMS) was ana-lyzed. Results There was significant difference in RMS among different swallowing modes (F>105.120, P0.05). There was no difference between two groups in both muscles under relax and dry swallow (t0.05), and was different under water swallow and continuous drinking (t>2.700, P<0.05). Conclusion sEMG could be used for analyzing the characteristics of amplitude of myoelectric activity in healthy mid-dle-aged and elderly people during pharyngeal swallowing in different swallowing modes, that can be used to evaluate and screen swallow-ing and dysphagia in clinic.

Efeitos de oito semanas de treinamento com estimulação elétrica neuromuscular nas razões de ativação muscular / torque de idosas com osteoartrite / Effects of eight weeks of neuromuscular electrical stimulation training on muscle activation / torque ratios in elderly women with osteoarthritis

Introdução: O envelhecimento causa prejuízos no sistema musculoesquelético que podem ocasionar a osteoartrite, provocando degeneração da cartilagem articular e, consequentemente, perdas funcionais a idosos acometidos. Por outro lado, a estimulação elétrica neuromuscular é utilizada como treinamento para fortalecimento muscular.Objetivo: Investigar o efeito de oito semanas de treinamento com neuromuscular electrical stimulation (NMES) nas razões de ativação root mean square (RMS) / torque dos músculos extensores do joelho em idosas com osteoartrite. Metodologia: Vinte e quatro idosas foram divididas em dois grupos: grupo saudável (SAU; n=12) e grupo osteoartrite (OA; n=12). O grupo OA foi submetido a oito semanas de treinamento com NMES e tempo de aplicação variando de 18 a 32 minutos e frequência semanal de três vezes.Resultados: No grupo OA, ocorreu um aumento dos valores RMS pós-treinamento comparado com o pré-treinamento (p<0,05). O grupo SAU permaneceu igual ao grupo OA pós-treinamento (p>0,05). O torque do quadríceps aumentou pós-treinamento no grupo OA no ângulo de 90° de flexão do joelho, contudo, o grupo SAU apresentou maior produção de torque em todos os ângulos avaliados (p<0,05). No grupo OA, houve aumento das razões RMS / torque após o treinamento para os ângulos de 60º, 75º e 90º de flexão do joelho (p<0,05), mas não diferindo do grupo SAU (p>0,05).Conclusão: Oito semanas de treinamento com NMES aumentaram a ativação muscular e torque dos músculos extensores do joelho no grupo osteoartrite, mas não foram capazes de gerar adaptações suficientes para igualar os mesmos ao grupo saudável.

Introduction: Aging affects the musculoskeletal system, which can lead to osteoarthritis, causing degeneration of the articular cartilage and consequently resulting in functional impairment among elderly patients. However, neuromuscular electrical stimulation (NMES) training can be used as a mode of muscle strengthening.Objective: To investigate the effects of eight weeks of NMES training of the knee extensors on the RMS/torque ratio of elderly persons with osteoarthritis.Methods: Twenty-four elderly women were assigned into two groups: a healthy group (HE; n=12) and an osteoarthritis group (OA; n=12). The OA group was submitted to eight weeks of NMES training.Results: In the OA group, the RMS values increased from the pre-training to the post-training periods (p<0.05). The HE group did not differ from the OA group in the post-training period (p>0.05). Quadriceps torque was higher in the OA group in the post-training period at 90º of knee flexion (p<0.05) but the torque in the HE group remained higher than in the OA group for all the angles evaluated (p<0.05). The RMS/torque ratios increased in the post-training period at 60º, 75º and 90º of knee flexion (p<0.05), but did not differ between the HE and OA groups (p>0.05).Conclusion: Eight weeks of NMES training resulted in a significant increase in the RMS and torque values of the quadriceps, but these neural adaptations were not sufficient to improve the osteoarthritis group to levels similar to the healthy group.

Surface Electromyography of Calf Muscle in Children with Growing Pains / 中国康复理论与实践

@#Objective To compare the differences of electrical activity in calf muscle of children with growing pains from normal children when standing and heel raising. Methods 32 children with growing pains and foot pronation were as growing pains group, and 32 normal children as control group. All the children were measure with surface electromyography (sEMG) of tibialis anterior, peroneus longus, medial gastrocnemius and tibialis posterior when standing and heel raising. Results The root mean square (RMS) of peroneus longus increased significantly in growing pains group when standing (P<0.01). The RMS decreased significantly in medial gastrocnemius (P<0.05) and increased significantly in tibialis posterior (P<0.01) when heel raising. Conclusion The characteristics of electrical activity in calf muscle is difference from the normal in the growing pains children with foot pronation during standing and heel raising.

Surface Electromyography of Calf Muscle in Children with Growing Pains / 中国康复理论与实践

Objective To compare the differences of electrical activity in calf muscle of children with growing pains from normal chil-dren when standing and heel raising. Methods 32 children with growing pains and foot pronation were as growing pains group, and 32 nor-mal children as control group. All the children were measure with surface electromyography (sEMG) of tibialis anterior, peroneus longus, medial gastrocnemius and tibialis posterior when standing and heel raising. Results The root mean square (RMS) of peroneus longus in-creased significantly in growing pains group when standing (P<0.01). The RMS decreased significantly in medial gastrocnemius (P<0.05) and increased significantly in tibialis posterior (P<0.01) when heel raising. Conclusion The characteristics of electrical activity in calf mus-cle is difference from the normal in the growing pains children with foot pronation during standing and heel raising.

Effect of ion-implantation on surface characteristics of nickel titanium and titanium molybdenum alloy arch wires.

Aim: To evaluate the changes in surface roughness and frictional features of 'ion-implanted nickel titanium (NiTi) and titanium molybdenum alloy (TMA) arch wires' from its conventional types in an in-vitro laboratory set up. Materials and Methods: 'Ion-implanted NiTi and low friction TMA arch wires' were assessed for surface roughness with scanning electron microscopy (SEM) and 3 dimensional (3D) optical profilometry. Frictional forces were studied in a universal testing machine. Surface roughness of arch wires were determined as Root Mean Square (RMS) values in nanometers and Frictional Forces (FF) in grams. Statistical Analysis Used: Mean values of RMS and FF were compared by Student's 't' test and one way analysis of variance (ANOVA). Results: SEM images showed a smooth topography for ion-implanted versions. 3D optical profilometry demonstrated reduction of RMS values by 58.43% for ion-implanted NiTi (795.95 to 330.87 nm) and 48.90% for TMA groups (463.28 to 236.35 nm) from controls. Nonetheless, the corresponding decrease in FF was only 29.18% for NiTi and 22.04% for TMA, suggesting partial correction of surface roughness and disproportionate reduction in frictional forces with ion-implantation. Though the reductions were highly significant at P < 0.001, relations between surface roughness and frictional forces remained non conclusive even after ion-implantation. Conclusion: The study proved that ion-implantation can significantly reduce the surface roughness of NiTi and TMA wires but could not make a similar reduction in frictional forces. This can be attributed to the inherent differences in stiffness and surface reactivity of NiTi and TMA wires when used in combination with stainless steel brackets, which needs further investigations.

Análise eletromiográfica dos músculos da coxa no exercício agachamento afundo até a exaustão / Thigh muscles electromyographic activity during lunge exercise to fatigue

O agachamento afundo possui um posicionamento dos membros inferiores diferencial em relação ao agachamento padrão, necessitando de maiores esclarecimentos acerca das participações dos músculos envolvidos. O objetivo foi analisar a atividade eletromiográfica dos músculos vastus lateralis (VL), vastus medialis (VM), bíceps femoris (BF) e semitendinosus (ST) durante a execução do agachamento afundo até à exaustão com o membro inferior posicionado frontalmente e posteriormente. Participaram do estudo nove mulheres ativas com média (DP) de idade de 22 (3,4) anos e massa corporal 60,3 (4,1) kg. O agachamento afundo foi dividido em duas etapas, diferindo apenas o posicionamento do membro inferior dominante (randomizado). Os sinais eletromiográficos foram captados utilizando um eletromiógrafo e analisados os valores "root mean square" (RMS) na fase concêntrica. Os resultados indicaram um aumento significativo do RMS em função do tempo para o membro inferior posicionado frontalmente e posteriormente (p< 0,001). No membro posicionado frontalmente, o aumento do RMS correspondeu a 50 por cento para o VL, 54 por cento para o VM e 48 por cento para o BF. O membro posicionado posteriormente apresentou um aumento de 75 por cento para o VL, 113 por cento para o VM, 62 por cento para o BF e 48 por cento para o ST. O RMS também foi significativamente maior no músculo VM em relação ao ST no membro inferior posicionado anteriormente (p = 0,03) e em relação ao ST e BF no membro inferior posicionado posteriormente (p = 0,02). Não ocorreu interação significativa entre o efeito do tempo e músculo na atividade eletromiográfica. O RMS normalizado não apresentou diferenças estatisticamente significativas no que se refere ao posicionamento do membro inferior dominante. A atividade muscular foi semelhante em ambos os posicionamentos do membro inferior, apresentando maior aumento de ativação dos músculos VL e VM em relação ao BF e ST.

The position of lower limbs during lunge is different from squat without clear understanding on differences in muscle activation. The objective was to compare the electromyographic activity of the vastus lateralis (VL), vastus medialis (VM), biceps femoris (BF) and semitendinosus (ST) during the execution of the lunge to exhaustion of the lower limb, changing position of the legs frontally and posteriorly. Nine active women participated of this study with a mean (SD) age of 22 (3.4) years and body mass 60.3 (4.1) kg. The lunge was divided in two phases, changing the forward leg (random order). The electromyographic signals were captured by an eletromyograph, and the root mean square (RMS) values were analyzed during the concentric phase. There was a significant increase of the RMS in time for the LL positioned frontally and posterior (p< 0,001). For the forward position, the increase of RMS was 50 percent for VL, 54 percent for VM and 48 percent for BF. The backward position had an increase of 75 percent for VL, 113 percent for VM, 62 percent for BF and 48 percent for ST. The RMS was significantly higher for VM than for ST the forward position (p = 0,03) and ST and BF for the backward position (p = 0,02). No interaction was observed between time and muscle in the electromyigraphic activity. The normalized RMS was not statistically different comparing the forward and backward position of the dominant leg. Muscle activity was similar in both positions of the LL, showing increased activation of the VM and VL muscles in relation to the BF and ST.

Effect of Electromyographic Biofeedback with Electric Stimulation Training on Dorsiflexion of Foot of Children with Spastic Diplegia / 中国康复理论与实践

@#Objective To investigate the effect of electromyographic biofeedback with electric stimulation (Est-EMGBFT) training on dorsiflexion of foot of cerebral palsy children with spastic diplegia type.Methods 66 cerebral palsy children with spastic diplegia type were randomly divided into the treatment group and control group with 33 cases in each group. The treatment group was treated with rehabilitation training plus Est-EMGBFT, while the control group with rehabilitation training only. The manual muscle test (MMT) of tibial muscle and the ankle joint initiative range of motion (I-ROM) were performed before and after 4 courses of treatment, and the treatment group was assessed by electromyographic (EMG) apparatus additionally.Results After treatment, the muscular force of children in the treatment group was higher than those in the control group significantly ( P<0.01) and the level of integrated electromyography (iEMG) and root mean square (RMS) assessed by sEMG increased significantly ( P<0.05), the I-ROM of the treatment group was higher than the control group significantly ( P<0.05).Conclusion Est-EMGBFT training can provide a satisfactory rehabilitation effect for the dorsiflexion of foot of cerebral palsy children with spastic diplegia type.

Quantitative Analysis of Bulbocavernosus Reflex Activity in Patients with Spinal Cord Injury

OBJECTIVE: To quantify activities of bulbocavernosus reflex (BCR) using root mean square (RMS) value of motor unit action potentials in power spectrum analysis. METHOD: Twenty-six male patients with spinal cord injury were studied. The BCRs were evaluated by one examiner. The patients were assigned into absent, hypoactive and normal reflex groups according to the degree of BCR activity. The electrophysiological activities of the BCRs were evaluated by the RMS value of the motor unit action potentials in power spectrum analysis recorded from the bulbocavernosus muscle using concentric needle electrode. RESULTS: The BCR by clinical examination was absent in 6 patients, hypoactive in 10 patients and normal in 10 patients. RMS values of absent, hypoactive and normal BCR groups were 15.1+/-3.6 uV, 26.7+/-13.2 uV and 36.3+/-4.8 uV, respectively. RMS values of three groups were significant different (p=0.028) and showed significant correlation (r=0.714, p= 0.005). CONCLUSION: There was strong correlation between RMS value of motor unit action potentials of bulbocavernosus muscle and degree of BCR activities estimated by clinical examination in patients with spinal cord injury.

Characteristics of Muscle Tone in Children with Hemiplegic Cerebral Palsy Examined with Surface Electromyography / 中国康复理论与实践

@#Objective To explore the surface electromyography(EMG)characteristics of biceps brachii during isometric contraction in children with hemiplegic cerebral palsy.Methods The surface electromyograms signals of biceps brachii of 10 children with hemiplegic cerebral palsy during passive isometric contraction were recorded.Results The intact side registered a stronger EMG than that of the affected side,the integrated electromyography(iEMG)and root mean square(RMS)levels from the intact side were higher than those of affected side significantly(P<0.05).Conclusion The results of electromyographic analysis are consistent with Modified Ashworth Scale.Electromyographic analysis can provide a satisfactory evaluation of the muscle tone in children with hemiplegic cerebral palsy.

Effect of Electromyographic Biofeedback Therapy on Spastic Diplegia Children with Cerebral Palsy / 中国康复理论与实践

@#Objective To investigate the curative effect of electromyographic(EMG) biofeedback therapy on spastic diplegia children with cerebral palsy.Methods42 children were divided into the treatment group(n=22) and control group(n=20) randomly.The treatment group was treated with rehabilitation training plus EMG biofeedback training,while the control group with rehabilitation training solely.Manual muscle test(MMT) was performed before and 3 months after treatment,and the treatment group was assessed by electromyographic apparatus additionally.ResultsAfter EMG biofeedback training,the muscular force of children in the treatment group was higher than those in the control group significantly(P<0.05) and the level of root mean square(RMS) and integrated electromyography(iEMG) assessed by surface electromyography(sEMG) increased significantly(P<0.05).ConclusionEMG biofeedback training can provide a satisfactory treatment for spastic diplegia children with cerebral palsy.Electromyographic apparatus is effective to assess muscular force.

Effect of Electromyographic Biofeedback Therapy on Spastic Diplegia Children with Cerebral Palsy / 中国康复理论与实践

@#Objective To investigate the curative effect of electromyographic(EMG) biofeedback therapy on spastic diplegia children with cerebral palsy.Methods42 children were divided into the treatment group(n=22) and control group(n=20) randomly.The treatment group was treated with rehabilitation training plus EMG biofeedback training,while the control group with rehabilitation training solely.Manual muscle test(MMT) was performed before and 3 months after treatment,and the treatment group was assessed by electromyographic apparatus additionally.ResultsAfter EMG biofeedback training,the muscular force of children in the treatment group was higher than those in the control group significantly(P<0.05) and the level of root mean square(RMS) and integrated electromyography(iEMG) assessed by surface electromyography(sEMG) increased significantly(P<0.05).ConclusionEMG biofeedback training can provide a satisfactory treatment for spastic diplegia children with cerebral palsy.Electromyographic apparatus is effective to assess muscular force.

Relationship between Handgrip Forces and Surface Electromyogram Activities of Forearm Muscle / 航天医学与医学工程

Objective To study the relationship between handgrip level and characteristics of surface electromyogram(sEMG)signal from forearm muscles.Methods Nine healthy volunteers were asked to do a specific grip test with three force levels of maximum volunteer contraction(MVC),80% MVC and 40% MVC.sEMG signal was recorded from flex digitorum superficial(FDS)and extensor carpi radialis longus(ECRL)simultaneously.The amplitude characteristics of sEMG signal were calculated by the means of root mean square(RMS)and wavelet analysis.Furthermore,to compare the relationship of sEMG and force level between different participants,SPSS was applied to analyze the relative value that was defined as the ratio between sEMG characteristics of MVC condition and that of different grip levels.Results There existed positive correlation between grip level and sEMG activity,stronger grip corresponded the greater sEMG characteristics for every participant,and this correlation revealed significant coherence between different volunteers.Conclusion There is significant correlation between grip force and forearm muscle activities represented as sEMG characteristics.The result suggests that sEMG can be used to predict grip force noninvasively for measuring motor function and assessing the motor function rehabilitation.

Three Newly Designed Arm Slings for the Stroke Patient with Shoulder Subluxation: A case report

We reported three types of newly designed arm slings (the "V" strap pouch arm sling, the Modified hemisling, the Tripod arm sling). The three slings and the conventional hemisling were all tested by a single stroke patient for the correction of shoulder subluxation. Sling effectiveness was evaluated by simple shoulder AP X-rays, quantitative electromyography (root mean square; RMS), strap tension, and preference of the patient. Of the four types, the "V" strap pouch arm sling reduced the vertical displacement the most. RMS values of the supraspinatus muscle tended decrease and strap tension was also lower after using the "V" strap pouch arm sling compared with others. The patient also preferred the "V" strap pouch arm sling to the other slings. We suggested that "V" strap pouch arm sling was the most effective among four types of arm slings (including conventional hemisling) for the correction of shoulder subluxation, and patient's preference.

Age and Spherical Equivalent Related Changes in Wavefront Aberrations

PURPOSE: To estimate the age and spherical equivalent related changes in the wavefront aberrations. METHODS: The age related difference in the wavefront aberrations were measured using a WASCA aberrometer on 63 eyes from 38 persons ranging in age from 18 to 60 years with a mean spherical equivalent of -0.55 diopter. The total RMS (root mean square), the high order RMS, coma and spherical aberration were analyzed and compared according to age(second, third, fourth, fifth and sixth decade). The spherical equivalent related difference in the wavefront aberrations were also measured on 118 eyes from 62 persons with a spherical equivalent ranging from +0.5 D to -10.5 D (average -4.87 D). The total RMS, high order RMS and spherical aberration were analyzed and compared according to the spherical equivalent. RESULTS: With increasing age, the total RMS showed no statistically significant increase (p>0.05), but a high order RMS and spherical aberration showed a significant increase (p0.05). With the increasing amount of spherical equivalent, the total RMS increased significantly (p0.05). CONCLUSIONS: In emmetropia, the total RMS and high order aberration increased significantly with increasing age. With increasing amount of spherical equivalent, the total RMS increased significantly while coma and the spherical aberrations did not.