Evaluación cefalométrica y electromiográfica de niños y niñas con incompetencia labial y anomalías dentomaxilares

Objetivo: Describir las características craneofaciales, dentoalveolares, de tejido blando, vía aérea y el patrón de actividad muscular determinadas a través de los estudios cefalométricos y electromiográficos de individuos incompetentes labiales y con presencia de anomalías dentomaxilares de 7 a 12 años de edad. Materiales y método: Cuarenta y seis participantes con incompetencia labial fueron sometidos a una toma de radiografía lateral de perfil para el análisis cefalométrico. Para el estudio electromiográfico se consideró el patrón de actividad de los músculos Orbicular superior de los labios, orbicular inferior de los labios y temporal anterior en funciones: reposo, fonoarticulación, deglución, máximo apriete labial. Resultados: Se observó clase II esqueletal y molar, retrusión mandibular, biprotrusión incisal, biprotrusión labial, disminución de vía aérea superior. La mayor actividad muscular fue observada en máximo apriete labial. Conclusión: Los niños y niñas con incompetencia labial y anomalías dentomaxilares presentan alteraciones en las características craneofaciales, dentoalveolares, de tejido blando, vía aérea y actividad muscular determinadas a través de los estudios cefalométricos y electromiográficos.

Objective: To describe craniofacial, dentoalveolar, soft issue and airway features, and the muscular activity, determined through a cephalometric and electromyographic study in individuals with lip incompetence and dentomaxillary anomalies aged 7 to 12 years. Methods: Forty-six participants with lip incompetence underwent lateral profile radiography for cephalometric analysis. For the electromyographic study, the activity of the superior orbicularis oris, inferior orbicularis oris and anterior temporalis muscles was considered in the following functions: rest, speaking, swallowing, and reciprocal compression of the lips. Results: Skeletal and molar class II, mandibular retrusion, labial biprotrusion, incisal biprotrusion, and upper airway dysfunction were found. The highest muscular activity was observed in reciprocal compression of the lips. Conclusion: Children with lip incompetence and dentomaxillary anomalies have alterations in the craniofacial, dentoalveolar, soft issue, and airway features, and in the muscular activity , determined through a cephalometric and electromyographic study.

Investigation of the Neuro-Regenerative Effects of Bioresonance and Magnetotherapy in Sciatic Nerve Damage-Induced Rats / Investigación de los Efectos Neurorregenerativos de Biorresonancia y Magnetoterapia en Ratas Inducidas por Daño del Nervio Ciático

SUMMARY: Peripheral nerve damage is a significant clinical problem that can lead to severe complications in patients. Regarding the regeneration of peripheral nerves, it is crucial to use experimental animals' nerves and use different evaluation methods. Epineural or perineural suturing is the gold standard in treating sciatic nerve injury, but nerve repair is often unsuccessful. This study aimed to investigate the neuroregenerative effects of magnetotherapy and bioresonance in experimental animals with sciatic nerve damage. In this study, 24 female Wistar rats were divided into 7 groups (n=6) as follows: Group 1 (Control), Group 2 (Axonotmesis control), Group 3 (Anastomosis control), Group 4 (Axonotmesis + magnetotherapy), Group 5 (Anastomosis + magnetotherapy), Group 6 (Axonotmesis + bioresonance), Group 7 (Anastomosis + bioresonance). Magnetotherapy and bioresonance treatments were applied for 12 weeks. Behavioural tests and EMG tests were performed at the end of the 12th week. Then the rats were sacrificed, and a histopathological evaluation was made. The statistical significance level was taken as 5 % in the calculations, and the SPSS (IBM SPSS for Windows, ver.21) statistical package program was used for the calculations. Statistically significant results were obtained in animal behaviour tests, EMG, and pathology groups treated with magnetotherapy. There was no statistically significant difference in the groups treated with bioresonance treatment compared to the control groups. Muscle activity and nerve repair occurred in experimental animals with acute peripheral nerve damage due to 12 weeks of magnetotherapy, and further studies should support these results.

El daño a los nervios periféricos es un problema clínico importante que puede conducir a complicaciones graves en los pacientes. En cuanto a la regeneración de los nervios periféricos, es crucial utilizar los nervios de los animales de experimentación y diferentes métodos de evaluación. La sutura epineural o perineural es el gold estándar en el tratamiento de lesiones del nervio ciático, pero la reparación del nervio a menudo no tiene éxito. Este estudio tuvo como objetivo investigar los efectos neuroregenerativos de la magnetoterapia y la biorresonancia en animales de experimentación con daño del nervio ciático. En el estudio, 24 ratas hembras Wistar se dividieron en 7 grupos (n=6) de la siguiente manera: Grupo 1 (Control), Grupo 2 (Control de axonotmesis), Grupo 3 (Control de anastomosis), Grupo 4 (Axonotmesis + magnetoterapia), Grupo 5 (Anastomosis + magnetoterapia), Grupo 6 (Axonotmesis + biorresonancia), Grupo 7 (Anastomosis + biorresonancia). Se aplicaron durante 12 semanas tratamientos de magnetoterapia y biorresonancia. Las pruebas de comportamiento y las pruebas de EMG se realizaron al final de la semana 12. Luego se sacrificaron las ratas y se realizó una evaluación histopatológica. El nivel de significación estadística se tomó como 5 % en los cálculos, y se utilizó el programa de paquete estadístico SPSS (IBM SPSS para Windows, ver.21). Se obtuvieron resultados estadísticamente significativos en pruebas de comportamiento animal, EMG y grupos de patología tratados con magnetoterapia. No hubo diferencia estadísticamente significativa en los grupos con tratamiento de biorresonancia en comparación con los grupos controles. La actividad muscular y la reparación nerviosa, se produjeron en animales de experimentación con daño nervioso periférico agudo, debido a 12 semanas de magnetoterapia.Estudios adicionales deberían respaldar estos resultados.

Evaluation of Muscle Fatigue in Spinal Surgery Instruments Based on sEMG-JASA / 中国医疗器械杂志

Based on the joint analysis of EMG spectrum and amplitude method (JASA), a study on muscle fatigue assessment of spinal surgical instruments based on surface EMG signals was carried out, and a comparative evaluation of the operating comfort before and after the optimization of spinal surgical instruments was completed. A total of 17 subjects were recruited to collect the surface EMG signals of their brachioradialis and biceps. Five surgical instruments before and after optimization were selected for data comparison, and the operating fatigue time proportion of each group of instruments under the same task was calculated based on the RMS and MF eigenvalues. The results showed that when completing the same operation task, the operation fatigue time of the surgical instruments before optimization was significantly higher than that after optimization (P<0.05); there was no significant difference in the fatigue status of brachioradialis and biceps when operating the same instrument (P>0.05). These results provide objective data and reference for the ergonomic design of surgical instruments and fatigue damage protection.

Design and Experimental Research of Synchronous Acquisition System of EMG and Blood Oxygen Signal / 中国医疗器械杂志

In this study, a surface electromyography (sEMG) and blood oxygen signal real-time monitoring system is designed to explore the changes of physiological signals during muscle fatigue, so as to detect muscle fatigue. The analysis method of sEMG and the principle of blood oxygen detection are respectively introduced, and the system scheme is expounded. The hardware part of the system takes STM32 as the core. Conditioning module composition; blood oxygen signal acquisition is based on near infrared spectroscopy (NIRS), specifically including light source, light source driving, photoelectric conversion, signal conditioning and other modules. The system software part is based on the real-time uC/OS-III software system. The characteristic parameters of sEMG were extracted by isometric contraction local muscle fatigue experiment; the relative changes of oxyhemoglobin (HbO2) and deoxyhemoglobin (Hb) were calculated in the forearm blocking experiment, thereby verifying that the system collects two signals effectiveness.

A pilot study on the functional outcome using markerless motion analysis tool and surface emg of nerve transfers for upper trunk brachial plexus injuries

INTRODUCTION@#Brachial plexus injuries (BPI) have devastating functional effects. Clinical outcomes of BPI reconstruction have been documented in literature; however, these do not use EMG and quantitative kinematic studies.@*OBJECTIVE@#This study aims to use a markerless motion analysis tool (KINECT) and surface EMG to assess the functional outcomes of adult patients with traumatic upper trunk BPI who have undergone nerve transfers for the shoulder and elbow in comparison to the normal contralateral limb.@*METHODS@#This is an exploratory study which evaluated three participants with BPI after nerve reconstruction. KINECT was used to evaluate the kinematics (range of motion, velocity, and acceleration) and the surface EMG for muscle electrical signals (root mean square, peak EMG signal, and peak activation time) of the extremities. The means of each parameter were computed and compared using t-test or Mann-Whitney U test.@*RESULTS@#Participant C, with the best clinical recovery, showed mostly higher KINECT and EMG values for the BPI extremity. There was a significant difference between the KINECT data of Participants A and B, with lower mean values for the BPI extremity. Most of the EMG results showed lower signals for the BPI extremity, with statistical significance.@*CONCLUSION@#The KINECT and surface EMG provide simple, cost-effective, quick, and objective assessment tools. These can be used for monitoring and as basis for formulating individualized interventions. A specific algorithm should be developed for the KINECT sensors to address errors in data collection. A fine needle EMG may be more useful in evaluating the muscles involved in shoulder external rotation.

Evaluation of muscle activity level in the lower extremities during various steps used in aerobic dance exercise / 体力科学

To create a safe and effective aerobic dance exercise (ADE) program, the intensity, and difficulty level of each step, and muscle activation during the program must be considered. This study evaluated the muscle activity levels of the lower extremities when major ADE movements were repeated at a fixed speed. The subjects were seven females 21-22 years old who were familiar with the ADE movements. Eleven low impact steps and nine high impact steps representative of the ADE movements were selected, and while the movements were performed, the surface electromyograms (EMG) of six muscles in the lower extremities were measured using a telemeter electromyograph. The EMG data for 10 cycles of each step were full wave rectified and integrated. Then, the average value per unit time was calculated, and normalized (%EMGmax) by the EMG integral value during isometric maximum voluntary contraction (EMGmax). The EMGmax was measured for each of the six muscles to evaluate the muscle activity level, and determine which muscles were activated at higher or lower levels in response to the specific steps. The highest levels of total muscle activity detected in the six muscles were for: double hop, jumping jack, and pendulum. The results of this study may help create ADE programs that consider the differences in muscle activation in the lower extremities.

Descriptive electromyography signals analysis of equine longissimus dorsi, rectus abdominis and gluteus medius muscles during maneuvers used to activate the core / [Análise descritiva do sinal eletromiográfico dos músculos longuíssimo dorsal, reto abdominal e glúteo médio de equinos durante a realização de manobras utilizadas para ativação do core]

Maneuvers to activate the equine's core can make a difference in their physical and psychic health. Although these activities are recommended and practiced, there is little research proving their effectiveness. This article aims to describe, through surface electromyography, the occurrences, durations and sequences activity of longissimus dorsi, rectus abdominis and gluteus medius during thoracolumbar flexion (TLF), lumbar and lumbosacral flexion (LLSF), global flexion (GF), which is the combination of TLF and LLSF, and tail traction (TT). Seven healthy adult horses of three different breeds performed five repetitions of these movements for five seconds (sec). Electromyographic activity was captured with non-invasive superficial sensors positioned in the skin regions covering these muscles. The sequence was performed once per animal, muscle activity captured by surface electromyography, data from two replicates of each animal were selected, analyzed on matLab software and data tabulation were described during each maneuver. These maneuvers provoked punctual and transient activation of muscles mentioned above, confirming the ability to activate equine core muscles. However, responses were not standardized, which means there were variations of occurrence, duration and sequence, suggesting that for practical application of those maneuvers it is necessary to perform more repetitions with longer durations to activate more muscles.(AU)

Manobras para ativação da musculatura do core equino podem ser diferenciais para saúde física e psíquica dos animais, sendo recomendadas e praticadas, mas existem poucas pesquisas comprovando a eficácia delas. Este artigo tem como objetivo descrever, por meio da eletromiografia de superfície, as ocorrências, as durações e as sequências temporais da atividade muscular do longuíssimo dorsal, do reto abdominal e do glúteo médio durante a realização das manobras de flexão toracolombar, flexão lombar e lombossacra, flexão global (toracolombar e lombossacra) e tração de cauda. Para isso, sete equinos adultos e hígidos de três raças realizaram esses quatro movimentos clássicos para ativar o core equino, com cinco repetições e manutenção do estímulo reflexivo por cinco segundos. Durante a realização, a atividade eletromiográfica foi capturada com a utilização de sensores superficiais posicionados de forma não invasiva em regiões cutâneas referentes a cada músculo. O protocolo completo de manobras foi realizado uma vez por cada animal enquanto a atividade muscular era capturada. Posteriormente, duas repetições de cada animal foram triadas e submetidas ao software matLab para análise. Com base na tabulação dos dados, foram descritas as variáveis eletromiográficas de presença ou ausência de ativação muscular, a duração média dos picos eletromiográficos superiores ao RMS (root mean square) e a sequência da atividade muscular observada durante cada manobra. Essas manobras provocaram ativações pontuais e transitórias nos três músculos, o que confirma a capacidade de excitar músculos do core equino. Contudo, as respostas não foram padronizadas, sugerindo que, na prática dessa atividade, devem-se realizar mais repetições com durações superiores a cinco segundos, a fim de se buscarem maiores ativações.(AU)

Effects of expiratory effort on force variability in isometric knee extension / 体力科学

The aim of the present study was to determine the effects of expiratory effort on the magnitude and low-frequency components of force variability during submaximal isometric knee extension (IKE). Eight subjects performed 5-s IKE of the dominant leg at the intensity of 10% of maximal voluntary contraction (10% MVC). During the IKE, the subjects performed one of three forced expirations (FEs) of different effort levels. The three effort levels of FE were 0% effort (normal breathing, FE0), 50% effort (FE50) and 100% effort (FE100). In the expiratory phase of each IKE, the amplitude of the force variability was quantified by the coefficient of variation (FCV), and the low-frequency components of the force variability were evaluated by calculating the peak power values of the filtered force signal (F) and rectified EMG signal with high-pass filtering (rEMGH) of the vastus lateralis muscle. The cross-correlation between F and rEMGH was also calculated. FCV was significantly higher in FE100 than in FE0 and FE50 (p < 0.01). The peak power values of F and rEMGH was significantly higher in FE100 than in FE0 (p < 0.05). Cross-correlation between F and rEMGH with the latter preceding the former was observed in each FE condition. These results suggest that FE with maximal effort (FE100) increased not only the absolute amount of force variation but also low-frequency oscillatory components of force and EMG and that low-frequency oscillations of motor unit firing may be responsible for the increase in force variation induced by FE.

Development of a Portable Chronic Non-specific Low Back Pain Measurement System / 中国医疗器械杂志

We developed a portable non-specific low back pain measurement system EasiLBP and evaluated its performance in collecting EMG signals:during the wearer's movement without the assistance of a doctor, the collection of EMG signals by portable devices met problems such as large noise interference, difficulty in accurately calibrating the start and end points of the action interval, and imbalanced samples for feature recognition, et al. To challenge these problems, we proposed a small group-based noise removal method, a dynamic dual-threshold automatic method for identifying the start and end points of the motion interval, and a sampling method to balance group samples, respectively. Portable device and a medical EMG acquisition equipment Thought Technology FlexComp Infiniti 10 were used to perform EMG measurements on 15 patients with non-specific low back pain and 15 normal people. Clinical experiments and statistical analysis show that the portable EMG acquisition system has significant differences in EMG signal characteristics between normal people and non-specific low back pain patients, and it has good measurement consistency and accuracy with the medical EMG acquisition equipment.

Clinical Efficacy of Modified Guizhi Jia Gegen Tang on Qi Stagnation and Blood Stasis Syndrome of Cervical Spondylotic Radiculopathy and Function of Neck and Upper Limb / 中国实验方剂学杂志

<b>Objective::To investigate the clinical efficacy of modified Guizhi Jia Gegen Tang on cervical spondylotic radiculopathy (CSR) with Qi stagnation and blood stasis syndrome and its effect on cervical vertebral mobility, isometric muscle strength and pain-related factors. <b>Method::Totally 162 CSR patients with Qi stagnation and blood stasis syndrome were randomly divided into observation group (81 cases) and control group (81 cases). The observation group was given modified Guizhi Jia Gegen Tang orally, 150 mL/time, twice a day, while the control group was given Jingshu granule orally for 6 g/time, twice a day. Both groups were treated for 8 weeks. The changes of median nerve F wave conduction velocity, cervical vertebral mobility, isometric muscle strength, CSR 20 subscale score and visual analogue score (VAS) were recorded before and after treatment. The total effective rate and the cure rate were counted after treatment. The levels of serum pain-related factors (5-HT), nerve growth factor (NGF) and prostaglandin E₂ (PGE₂) were measured before and after treatment. <b>Result::The total effective rate of the observation group was 98.77%, and the cure rate was 40.74%, which were better than 83.95%and 7.41%of the control group (<italic>P</italic><0.01). Compared with before treatment, the conduction velocity of median nerve F wave, cervical vertebral mobility, isometric muscle strength and CSR 20 score increased, whereas VAS score, pain related factors 5-HT, NGF and PGE₂ content decreased in both groups (<italic>P</italic><0.01). Compared with control group, median nerve F wave conduction velocity, cervical vertebral mobility, isometric muscle strength and CSR 20 subscale scores increased, while VAS score decreased, pain related factors 5-HT, NGF and PGE₂ contents decreased in the observation group (<italic>P</italic><0.01). <b>Conclusion::Modified Guizhi Jia Gegen Tang is effective in treating CSR with Qi stagnation and blood stasis syndrome, and can significantly improve the neck and hand functions and relieve pain.

Does Motor Control Exercise Decreases Lumbar Pain, Improves Muscle Activity And Regional Function In Individuals With Acute And Sub Acute Non-Specific Low Back Pain

Background: Non-specific low back pain (LBP) is defined as LBP that poses signs and symptoms which cannot be related to a recognizable cause, and Motor Control Exercise (MCE) usually is the choice of treatment for conditioning lumbar muscles for chronic LBP group. Limited information is available regarding their clinical application for participants with acute and sub-acute LBP. Hence, the main aim of this study is to find out this clinical utility. Methods: A quasi-experimental study with 30 participants of less than six weeks and twelve weeks duration of LBP were included in the study and are divided into an experimental and control group. Pain intensity using numeric pain rating scale (NPRS), lumbar range using modified Schober’s test, muscle function using surface electromyography (EMG) and functional disability using Roland Morris Disability Questionnaire (RMDQ) were recorded pre and post-treatment. The experimental group received lumbar MCE with general exercises and the control group received only general low back exercises aiming to improve lumbar range and muscle efficiency for six-session spread over three weeks duration along with therapy for pain reduction. Results: Subjects in both experimental & control groups had significant improvement in pain (p<.001) and RMD Questionnaire (P<.001), Lumbar range of motion had improved significantly only in the experimental group (Flexion p<.001, Extension p<.001) compared to control group. Though lumbar muscle activation had improved in both the groups, subjects in the experimental group showed significant and uniform improvement in lumbar muscle activation following MCE than the control group. Conclusion: Motor Control Exercise provides better clinical improvement in pain, lumbar muscle activation and regional functional ability without exacerbating symptoms in subjects with LBP during the acute and sub-acute phase.

Gluteus Medius and Tensor Fascia Latae muscle activation levels during multi-joint strengthening exercises

Aim: To compare the activation of GMed and TFL in four multi-joint exercises in strength training protocols and to verify if the level of muscle activation is indicated for strength gains in resistance training protocols. Methods: Eleven recreational lifters had normalized muscle activation of GMed and TFL assessed during ten maximal repetitions of four multi-joint exercises: (1) bilateral supine bridge (BiBRG); (2) bilateral supine bridge with hip abducted (BiBRG-AB); (3) unilateral supine bridge (UniBRG) and (4) single-leg squat (SLS). Results: A load of exercises was significantly greater for the BiBRG and BiBRG-AB compared to the UniBRG and SLS (p<0.001). We observed that GMed activation was significant greater compared to TFL among the four exercises (p=0.004) [BiBRG: Δ=26.2%; BiBRG-AB: Δ=27.3%; UniBRG: Δ=24.5% and SLS: Δ=18.8%]. Additionally, GMed activation was classified as moderate (<40%iMVC) and TFL activation was classified as low (<20%iMVC) in all exercises. Conclusion: Our results demonstrated that GMed is more active than TFL in all analyzed exercises. However, the level of activation observed for GMed was below that recommended to strength gain in resistance training programs.(AU)

Neuromuscular and motor patterns in breaststroke technique / Padrões motores e musculares na técnica de bruços

Abstract The aim of this study was to analyze the inter-temporal neuromuscular and motor patterns in breaststroke technique. Five national level male swimmers performed 200 m breaststroke at maximal effort. Electromyography data onbiceps brachii, deltoid anterior, pectoralis major and triceps brachiiwere analysed. The relative duration of active and non-active phase and the average rectified value for the neuromuscular patterns were recorded. The swim bouts were videotaped in sagittal plane with a pair of cameras and the Theme software 5.0 was used toanalyse the detected patterns in each swimmer. The neuromuscular pattern revealed that by the average rectified value the biceps brachiiand triceps brachiiwere increased at the end of the test for swimmers 1 and 5, while biceps brachii. deltoid anteriorand pectoralis majorwere increased for swimmers 2 and 4. Different motor patterns between cycles, and between swimmers were observed.We found similarities between the swimmers, adjusting their style to the technical model. The absence of a neuromuscular pattern for all swimmers could be related to different technical models used by each swimmer, as presented in the motor patterns. These findings suggested that each swimmers adapted their own motor and neuromuscular pattern in a unique and distinct way.

Resumo O objetivo deste estudo consistiu em analisar a relação entre os padrões neuromusculares e motores na técnica do nado de peito. Cinco nadadores masculinos de nível nacional realizaram 200 mnado peito na máxima intensidade.Foram registrados dados de Electromiografia do bicepsbrachii, deltoid anterior, pectoralis major etricepsbrachii. A duração relativa da fase ativa e não ativa e o valor médio retificado dos padrões neuromusculares foram analisados. Os percursos de nado foram gravados no plano sagital e analisados para detectar os padrões motores de cadanadador através do software THÉME software 5.0. Os padrões neuromusculares indicaram, por meio do valor médio retificado que a atividade dos músculos bíceps brachii e tríceps brachii aumentam no final do teste para o nadador 1 e 5, enquanto que o bíceps brachii. deltoid anterior. pectoralis major aumentam para o nadador 2 e 4. Diferentes padrões motores entre ciclos e entre nadadores foram observados, indicando que existem semelhanças entre eles, levando a um ajuste do estilo e modelo técnico de nado. A ausência de um padrão neuromuscular para todos os nadadores poderá estar relacionada com os diferentes modelos técnicos utilizados por cada nadador, como demonstrado nos padrões motores. Esses resultados sugerem que cada nadador adapta o seu padrão motor e muscular de uma forma única e distinta.

Choice of Muscles for Extracting Consistent Motor Modules: The Effect of Trial-to-Trial Electromyography Repeatability / 医用生物力学

Objective To identify the effect of the repeatability of muscle activations on extraction of consistent motor modules across trials. Methods The activities of sixteen muscles in twelve subjects who consistently walked at a self-selected speed were recorded. The intraclass correlation coefficient (ICC) was used to identify inter-stride repeatability of muscle activities and motor modules. Based on the repeatability of muscle activation, three types of muscle sets were organized. Results The reliable set containing the muscles showed high ICC (>0.4), but the whole-body and mixed sets containing the muscles showed poor ICC (＜0.4). When motor modules were extracted from each set, the reliable set showed the highest repeatability of motor module extraction, but the whole-body and mixed sets presented significantly lower repeatability. Conclusions Greater repeatability of muscle activations result ed in consistent motor modules. Extraction of consistent motor modules was a critical issue, especially in real-time motion recognition based on muscle patterns.

Choice of Muscles for Extracting Consistent Motor Modules: The Effect of Trial-to-Trial Electromyography Repeatability / 医用生物力学

Objective To identify the effect of the repeatability of muscle activations on extraction of consistent motor modules across trials. Methods The activities of sixteen muscles in twelve subjects who consistently walked at a self-selected speed were recorded. The intraclass correlation coefficient (ICC) was used to identify inter-stride repeatability of muscle activities and motor modules. Based on the repeatability of muscle activation, three types of muscle sets were organized. Results The reliable set containing the muscles showed high ICC (>0.4), but the whole-body and mixed sets containing the muscles showed poor ICC (＜0.4). When motor modules were extracted from each set, the reliable set showed the highest repeatability of motor module extraction, but the whole-body and mixed sets presented significantly lower repeatability. Conclusions Greater repeatability of muscle activations result ed in consistent motor modules. Extraction of consistent motor modules was a critical issue, especially in real-time motion recognition based on muscle patterns.

Design of Paravertebral Muscle Monitoring System Based on Surface Electromyography / 中国医疗器械杂志

In order to diagnose and evaluate the human spinal lesions through the paravertebral muscles, a paravertebral muscle monitoring system based on surface EMG signals was designed. The system used surface mount electrodes to obtain the surface myoelectric signal (sEMG) of paravertebral muscle. The signal was filtered and amplified by the conditioning circuit. The signal was collected by the microcontroller NRF52832 and was sent to the mobile APP. After the signal was preprocessed by the wavelet threshold denoising algorithm in APP, the time and frequency characteristics of the sEMG signal reflecting the functional state of the muscle were extracted. The calculated characteristic parameters was displayed in real time in the application interface. The experimental results show that the system meets the design requirements in analog signal acquisition, digital processing of signals and calculation of characteristic parameters. The system has certain application value.

Reduction in knee pain symptoms in athletes using an acupuncture protocol / Redução da sintomatologia dolorosa de joelho em atletas utilizando protocolo de acupuntura

ABSTRACT Pain in the lower limbs is common in athletes and a limiting factor in performance. Acupuncture has shown positive effects as an analgesic treatment and may potentially be used for pain reduction in runners. This study aimed to analyze the parameters associated with knee pain by correlating strength parameters of the musculature assessed in runners treated with acupuncture. A descriptive longitudinal study was conducted on 34 runners of both sexes aged 20 to 52 years, who presented with knee-related pain from January to June, 2015. Two pain questionnaires and a maximal strength test with electromyographic evaluation of the rectus femoris, vastus lateralis, and medialis muscles were used, and patients were monitored during five follow-up visits after an acupuncture protocol. All participants reported experiencing a decrease in knee pain after treatment. The affected limbs showed an increase in average strength by 34% and 25% compared to the contralateral limb. An increase in the number of motor units recruited for the three muscles was observed in both limbs. In conclusion, the proposed acupuncture protocol was effective in reducing pain symptoms in the knee region of athletes, thus influencing their gain in strength and muscle balance. Level of Evidence IV, Case series.

RESUMO A dor em membros inferiores é comum em atletas e representa um aspecto limitante ao rendimento. Buscando atenuação para a dor desta população, utiliza-se a acupuntura por apresentar bons efeitos na analgesia. Objetivo: analisar os parâmetros relacionados à dor de joelho correlacionando os parâmetros de força das musculaturas avaliadas em corredores submetidos a tratamento de acupuntura. Métodos: Foi realizado um estudo longitudinal, de janeiro a junho de 2015, com 34 corredores de 20 a 52 anos de ambos os sexos, que apresentassem dor de joelho. Foram aplicados dois questionários de dor e um teste de força máxima com avaliação eletromiográfica dos músculos reto femoral, vasto lateral e medial, com cinco atendimentos seguindo um protocolo de acupuntura. Resultados: Todos os voluntários relataram diminuição da dor de joelho após o tratamento. A média de força do membro afetado teve incremento de 34% e do membro contralateral de 25%. Verificou-se aumento no número de recrutamento de unidades motoras para os três músculos avaliados em ambos os membros. Conclusão: O protocolo proposto se mostrou eficaz na diminuição da sintomatologia dolorosa na região de joelhos de atletas corredores, interferindo no ganho de força e no equilíbrio muscular. Nível de Evidência IV, Série de casos.

Neuromonitoring for Spinal Cord Stimulation Lead Placement Under General Anesthesia

Spinal cord stimulation (SCS) is a common therapeutic technique for treating medically refractory neuropathic back and other limb pain syndromes. SCS has historically been performed using a sedative anesthetic technique where the patient is awakened at various times during a surgical procedure to evaluate the location of the stimulator lead. This technique has potential complications, and thus other methods that allow the use of a general anesthetic have been developed. There are two primary methods for placing leads under general anesthesia, based on 1) compound muscle action potentials and 2) collisions between somatosensory evoked potentials. Both techniques are discussed, and the literature on SCS lead placement under general anesthesia using intraoperative neurophysiological mapping is comprehensively reviewed.

Influences on Sports Biomechanics of Lower Extremities During Running on Different Surfaces / 医用生物力学

Risk factors for running injuries can be clustered into intrinsic factors and extrinsic factors. Intrinsic factors include human anatomy, history of previous injuries, sports biomechanics and human neuromuscular control, etc. Extrinsic factors include training method , running shoes and running surfaces, etc. Running surface is considered as one of the most potential risk factors for running injuries. This review summarized the findings on kinematics, kinetics, neuromuscular control and running injuries of lower extremity during running on different surfaces. In general, neuromuscular adjustment may contribute to kinematic adaption during running on different surfaces, and runners can adapt their kinetics and stiffness of lower extremity to achieve similar impact force. However, studies on biomechanical changes during running on different surfaces mainly focus on only one aspect of kinematics, kinetics and neuromuscular regulation. Further studies should focus on three-dimensional biomechanical analysis during running on different surfaces, as well as specific mechanisms of neuromuscular regulation for these biomechanical adjustments.

Electromyography-signal-based muscle fatigue assessment for knee rehabilitation monitoring systems

This study suggested a new EMG-signal-based evaluation method for knee rehabilitation that provides not only fragmentary information like muscle power but also in-depth information like muscle fatigue in the field of rehabilitation which it has not been applied to. In our experiment, nine healthy subjects performed straight leg raise exercises which are widely performed for knee rehabilitation. During the exercises, we recorded the joint angle of the leg andEMGsignals from four prime movers of the leg: rectus femoris (RFM), vastus lateralis, vastus medialis, and biceps femoris (BFLH). We extracted two parameters to estimate muscle fatigue from the EMG signals, the zero-crossing rate (ZCR) and amplitude of muscle tension (AMT) that can quantitatively assess muscle fatigue from EMG signals. We found a decrease in the ZCR for the RFM and the BFLH in the muscle fatigue condition for most of the subjects. Also, we found increases in theAMT for the RFM and the BFLH. Based on the results, we quantitatively confirmed that in the state of muscle fatigue, the ZCR shows a decreasing trend whereas theAMT shows an increasing trend. Our results show that both the ZCR and AMT are useful parameters for characterizing the EMG signals in the muscle fatigue condition. In addition, our proposed methods are expected to be useful for developing a navigation system for knee rehabilitation exercises by evaluating the two parameters in two-dimensional parameter space.