Masticatory muscle activation patterns manifested by changes in index values

Parodontologiya, Год журнала: 2025, Номер unknown

Опубликована: Янв. 14, 2025

Relevance. Surface electromyography (sEMG) is a method used to record the bioelectrical activity of masticatory muscles both at rest and during movement. This generates relative metrics (indices) that reflect relationship between biopotentials individual muscle pairs. The objective this study was explore activation patterns temporal masseter different test movements, as expressed by variations in index values, while accounting for correlations among metrics. Materials methods. performed on 165 participants aged 18 25 years. involved following tests: “Physiological rest”, “Habitual occlusion”, “Maximal voluntary clenching dental arches”, cotton rolls”. Indices were calculated characterize distribution homologous (symmetry indices) pairs (the static stabilizing occlusal mandibular lateral displacement index). Initially, divided into three groups 20 individuals each based (TORS) values recorded rest” test. Data compared across these groups. Subsequently, same again each, TORS obtained occlusion” test, results procedure repeated indices derived from arches” rolls” tests. ultimately examined 12 categorized (%) four ≤80% (groups 1, 4, 7, 10), 95–105% 2, 5, 8, 11), ≥120% 3, 6, 9, 12). mean measured determine statistically significant differences. Correlations evaluated their presence, strength, direction within Results. analysis identified positive correlation symmetry ranging moderate strong: 1 2 (r s = 0.6, p < 0.001), 3 0.8, 0.001. In also correlated with index, displaying strong negative association: а -0.57, -0.49, -0.7, 0.001). arch without tension characterized positive: 4 5 0.81, 6 0.41, 0.002), 0.65, A observed test: 7 8 9 -0.67, -0.8, Similarly, found "Maximal Voluntary Clenching Rolls" Further revealed Dental Arch Clenching" Conclusion. established strongest occurred parameters influenced symmetrical Variations predominantly driven indicating left right muscles. tests involving maximal contraction, strongly occurrence torsional (lateral)

Язык: Английский

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Lower Limb Exoskeleton Sensors: State-of-the-Art

Sensors, Год журнала: 2022, Номер 22(23), С. 9091 - 9091

Опубликована: Ноя. 23, 2022

Due to the ever-increasing proportion of older people in total population and growing awareness importance protecting workers against physical overload during long-time hard work, idea supporting exoskeletons progressed from high-tech fiction almost commercialized products within last six decades. Sensors, as part perception layer, play a crucial role enhancing functionality by providing accurate real-time data possible generate reliable input for control layer. The result processed sensor is information about current limb position, movement intension, needed support. With help this review article, we want clarify which criteria sensors used are important how standard types, such kinematic kinetic sensors, lower exoskeletons. We also outline possibilities limitations special medical signal detecting, e.g., brain or muscle signals improve at human-machine interface. A topic-based literature product research was done gain best overview newest developments, results, field. paper provides an extensive that need be considered use exoskeletons, well collection their placement exoskeleton products. Additionally, article points out several types detecting physiological environmental might beneficial future developments.

Язык: Английский

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The effect of myofascial techniques on the electrical activity of the neck muscles

Russian Osteopathic Journal, Год журнала: 2024, Номер 1, С. 78 - 91

Опубликована: Март 26, 2024

Introduction. Research by foreign scientists often present the results of studies effects specific osteopathic techniques on body. Myofascial are dynamic low-amplitude in which myofascial complex tissues is rhythmically stretched areas where their mobility limited. In one study paravertebral muscles using surface electromyography (sEMG) before and after techniques, a statistically significant ( p <0,05) decrease electrical activity was obtained. No publications devoted to effect neck were found. The aim individuals with increased tone these muscles. Materials methods. A prospective conducted Department Osteopathy Mechnikov North-West State Medical University 30 apparently healthy volunteers who did not active complaints, aged from 23 35 years, took part, median 25 years. Inclusion criteria palpation-determined sternocleidomastoid upper trapezius Non-inclusion presence diseases and/or conditions that an absolute contraindication correction, history injuries; taking medications affect muscle at time study; neuromuscular diseases. At beginning study, all underwent palpation both sides. degree increase assessed points: 1 — weak; 2 medium; 3 strong; 0 normal tone. Next, they mobilization techniques: longitudinal unilateral lateral soft neck, separate Before, immediately after, three days session, recorded (sEMG), performed wireless monitoring for electrophysiological signals «Kolibri» (OOO NMF «Neurotech», Russia). rest, average maximum amplitude measured. recording made synchronously right left sides Results. sEMG indices different based subjective assessment highly =0,0001). Moreover, according A(avg) indicator, range diagrams either intersect or intersected only slightly. decreased significantly remained same level =0,01). Such dynamics observed activity. slightly greater than (all subjects right-handed), but differences reach statistical significance >0,05). After treatment, there trend towards asymmetry between muscles, middle maximum, changes part treatment this excluded due technical reasons. Conclusion. showed osteopaths (who completing residency training osteopathy) palpably distinguish its weak moderate degrees. One session leads sEMG. occur then persist least young people Surface can be used objectively record measure techniques. This important increasing evidence clinical research osteopathy.

Язык: Английский

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Surface EMG: Applicability in the Motion Analysis and Opportunities for Practical Rehabilitation

Human Physiology, Год журнала: 2021, Номер 47(2), С. 237 - 247

Опубликована: Март 1, 2021

Язык: Английский

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Dry Epidermal Electrodes Can Provide Long-Term High Fidelity Electromyography for Limited Dynamic Lower Limb Movements

Sensors, Год журнала: 2020, Номер 20(17), С. 4848 - 4848

Опубликована: Авг. 27, 2020

Due to the limitations of standard wet Silver/Silver Chloride (Ag/AgCl) hydrogel electrodes and growing demand for long-term high fidelity surface electromyography (EMG) recording, dry epidermal are great interest. Evaluating usability signal could help determine extent potential applications using EMG electrodes. We collected signals over eight days from right rectus femoris seven subjects single-use traditional Ag/AgCl while covered uncovered during dynamic movements (leg extension, sit-to-stand, treadmill walking at 0.75 m/s 1.30 m/s). quantified signal-to-noise ratio (SNR); signal-to-motion (SMR); a metric we previously developed, Signal Quality Index, which considers that better quality requires both good ratio. Wear patterns degraded quality. Uncovered remained intact maintained adhesion skin had ratios, Index values were above acceptable thresholds limited lower limb extension sit-to-stand). This indicated provide across all five these movements. For walking, ratios still threshold, but far below thresholds. The showed no visible wear was stable days. As expected, covering improved quality, only Overall, able maintain recording movements, further improvement is needed reduce motion artifacts whole body such as walking.

Язык: Английский

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Biomechanical Analysis: Adapting to Users’ Physiological Preconditions and Demands

Biosystems & biorobotics, Год журнала: 2018, Номер unknown, С. 47 - 61

Опубликована: Янв. 1, 2018

Язык: Английский

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Assessment of Single Use Dry Epidermal Electrodes for Surface Electromyography Recordings

Опубликована: Март 1, 2019

Alternatives to conventional wet Silver/Silver Chloride (Ag/AgCl) hydrogel electrodes could greatly improve the ability record long-term surface electromyography (sEMG). This paper presents preliminary evaluation of dry epidermal electronic system (EES) over 8 days measurements. We tested 3 subjects and recorded sEMG signals right rectus femoris during static dynamic tasks from traditional Ag/AgCl electrodes. For that remained intact maintained adhesion skin, signal-to-noise ratio (SNR) values were greater than 16.9 dB signal-to-motion (SMR) 13.1 dB, which both above accepted thresholds for good signal quality (SNR > 15 SMR 12dB). also developed a new metric, Signal Quality Index, SQI help determine whether higher SNR or necessarily indicative better EMG quality. Our results indicated single use able maintain high suggested have potential recording.

Язык: Английский

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Principles of Efficiency and Safety Assessment in Using Exoskeletons for Patients with Lower Limb Paralyses (Review)

Sovremennye tehnologii v medicine, Год журнала: 2016, Номер 8(4), С. 231 - 240

Опубликована: Дек. 1, 2016

Язык: Английский

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Modelling a project for the development of a neurocomputer interface based on EMG

IOP Conference Series Materials Science and Engineering, Год журнала: 2020, Номер 940(1), С. 012018 - 012018

Опубликована: Сен. 1, 2020

Abstract Currently, around the world, various neurocomputer interfaces (NCI) are being actively developed for controlling prostheses, exoskeletons, robots, interacting with virtual reality, rehabilitation medicine, and even professional sports. Development research in field of medicine will help partially fully restore functional capabilities people amputation or congenital defects limbs. Thus, purpose this work is to review methods recording control signals bionic devices based on analysis physiological nervous processes humans modeling a project developing interface EMG using flexible management. In regard, first all, it interesting develop sensor controller further use systems robotic prostheses. At moment, design management has been made prototype five channels connecting sensors USB communication personal computer manufactured. Also was 5 computer.

Язык: Английский

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The experimental investigation of the sensitivity in the exoskeleton control loop

Опубликована: Авг. 24, 2020

An exoskeleton system contains a human operator in the control loop, which imposes restrictions on applied algorithms and movement speed.Thus, creation of device with an EMG-based that takes into account interaction humans design elements becomes one most actual tasks modern robotics.At moment, there are number research projects towards algorithms.These include consideration fatigue person arising from over long period time.Operator's fatigue, as result monotonous operations, leads to fact efficiency decreases, positioning error will increase time.Another task when controlling using biopotentials is compensation influence operator's tremor signal.Also, very important factor adaptation actuators change transient characteristics external internal forces.The designed should prevent possible injuries while device.This article describes results tests arm DC drive located elbow joint algorithm based electromyogram biceps brachii triceps operator.The structure features experimental stand developed laboratory robotics mechatronics IPMech RAS shown.The parameter settings during calibration shown.

Язык: Английский

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