• Title/Summary/Keyword: Electrical muscle stimulation

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The effects of neuromuscular electrical stimulation on skeletal muscle architecture and qualitative properties in vivo

  • Lee, Jeong-Woo;Yoon, Se-Won
    • International Journal of Contents
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    • v.5 no.4
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    • pp.35-39
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    • 2009
  • The purpose of this study was to evaluate the changes in skeletal muscle architecture and qualitative properties by muscle contraction force when neuromuscular electrical stimulation (NMES) of 50% MVIC was applied. Sixteen subjects (8 male, 8 female) without neuromuscular disease volunteered to participate in the study. All subjects were divided into two subgroups: control (no electrical stimulation) group and 50% maximal voluntary isometric contraction (MVIC) group. NMES training program was performed in the calf muscle three times a week for 10 weeks. Before and after the experiments, the MVIC of ankle plantar flexor was measured by the use of dynamometer, and the ultrasonography in the gastrocnemius medialis muscle was measured. The following results were obtained; MVIC was significantly increased in the electrical stimulation groups. Pennation angle, muscle density, and white area index also considerably changed in the electrical stimulation groups. In conclusion, the NMES training of 50% MVIC, comparative low level, improved the skeletal muscle architecture and the qualitative properties as well as the muscle contraction force.

Musculotendon Model to Represent Characteristics of Muscle Fatigue due to Functional Electrical Stimulation (기능적 전기자극에 의한 근육피로의 특성을 표현하는 근육 모델)

  • Lim, Jong-Kwang;Son, Jae-Hyun;Nam, Moon-Hyon
    • Proceedings of the KIEE Conference
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    • 1999.07b
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    • pp.656-658
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    • 1999
  • This paper presents musculotendon model to show the decline in muscle force during functional electrical stimulation (FES). It represent muscle activation and contraction concepts including muscle fatigue. A muscle fatigue term in activation dynamics as a function of the intracellular acidification and the pulsewidth of stimulation pulses change activation to decline muscle force. The computer simulation shows that muscle force decline in stimulation time.

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Muscle Model including Muscle Fatigue Dynamics of Stimulated Skeletal Muscle (전기자극에 의한 골격근의 근육피로를 고려한 근육모델)

  • Lim, Jong-Kwang;Nam, Moon-Hyon
    • The Transactions of the Korean Institute of Electrical Engineers A
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    • v.48 no.11
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    • pp.1476-1478
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    • 1999
  • A musculotendon model is proposed to predict muscle force during muscle fatigue due to the continuous functional electrical stimulation(FES). Muscle fatigue dynamics can be modeled as the electrical admittance of muscle fibers and included in activation dynamics based on the{{{{ { Ca}^{2+ } }}}} kinetics. The admittance depends on the fatigue variable that monotonically increase or decrease if electrical pulse exists or not, and on the stimulation parameters and the number of applied pulses. In the response of the change in activation the normalized Hill-type contraction dynamics connected with activation dynamics decline the muscle shortening velocity and thus its force under muscle fatigue. The computer simulation shows that the proposed model can express the muscle fatigue and its recovery without changing any stimulation parameters.

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Effect of Exercise with Functional Electrical Stimulation and Transcutaneous Electrical Nerve Stimulation on Muscle Tone, Stiffness of Calf Muscle, and Balance Ability in Patients with Stroke (치료적 운동에 기능적 전기자극과 경피신경전기자극 결합이 뇌졸중 환자의 근긴장도 및 뻣뻣함, 균형능력에 미치는 영향)

  • Park, Shin-Jun;Cho, Kyun-Hee;Cho, Yong-Hun
    • Journal of the Korean Society of Physical Medicine
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    • v.12 no.2
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    • pp.43-52
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    • 2017
  • PURPOSE: This study aimed to compare the impact of exercise with that of functional electrical stimulation (FES) and transcutaneous electrical nerve stimulation (TENS) on muscle tone, calf muscle stiffness, and balance ability in patients with stroke. METHODS: Thirty patients with stroke were randomly divided into an FES group (n=15) and a TENS group (n=15), and a progressive task-oriented exercise was assigned to them. These exercises were performed non-synchronously from December 5, 2016 to January 31, 2017. Patients underwent TENS and simultaneously exercised for 30 minutes daily, 5 times a week for 4 weeks. To determine the effect of the interventions, muscle tone and stiffness of the medial and lateral region of gastrocnemius muscle were measured using the MyotonPRO instrument and balance was assessed using the Berg Balance Scale. RESULTS: Both groups revealed a significant decrease in muscle tone and stiffness of the medial part of gastrocnemius muscle before and after the interventions (p<.05). Berg Balance Scale scores increased significantly (p<.05). However, none of the other parameters were significantly different (p>.05). CONCLUSION: Our results prove that progressive task-oriented exercise along with FES and TENS decreases muscle tone and stiffness of the gastrocnemius muscle in patients with stroke and improves balance. TENS could serve as a complementary replacement for functional electrical stimulation for in-house training, as TENS poses less risk of muscle fatigue and has lesser contraindications than does functional electrical stimulation.

The Effect of Electrical Muscle Stimulation Therapy on Chronic Knee Pain for Aged (노인의 만성 무릎 통증에 대한 전기 근육 자극요법의 적용 효과)

  • Sok, So-Hyune;Kim, Kwuy-Bun
    • Journal of East-West Nursing Research
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    • v.11 no.1
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    • pp.5-11
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    • 2005
  • Purpose: This study is to examine the effect of electrical muscle stimulation therapy on chronic knee pain for aged. Method: Design was randomized one-group pretest-posttest design. Samples were total 15 elderly on 60 years old and above with chronic knee pain. Measures were S-F McGill Pain Questionnaire and Arthritis Impact Measurement Scale for knee pain. Electrical muscle stimulation therapy, experimental treatment was applied on chronic knee pain for 4 weeks, 3 times/week, 15 min/time. Data were collected from half March 2005 to May 2005. Data were analyzed using SPSS PC+ 12 version. Descriptive statistics was used for analysis of general characteristics in sample, and paired t-test was used to analysis the effect of electrical muscle stimulation therapy. Results: After receiving the electrical muscle stimulation therapy chronic knee pain was significantly decreased (t=-29.163, P=.000 in S-F MPQ; t=-37.005, P=.000 in AIMS). Conclusion: Electrical muscle stimulation therapy can be a better effective primary nursing intervention on chronic knee pain for aged in community.

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A Study on the High Sensitivity Electrical Muscle Stimulation (EMS) Pad Using E-TEXTILE (E-TEXTILE을 이용한 고감성 전기 근육 자극(EMS)패드의 연구)

  • Yeun, Eun-Ji;Kim, Joo-Yong
    • Science of Emotion and Sensibility
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    • v.24 no.3
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    • pp.81-90
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    • 2021
  • EMSCT (Electrical Muscle Stimulation Conductive Textile) is an electrical muscle stimulation pad that can compensate for ease of use and comfort, which are disadvantages of conventional hydrogel pads used in electrical muscle stimulation (EMS). With the concentration with SWCNT (Single-Walled Carbon Nanotube) and the number of impregnation processes, EMSCT was tested by giving conductivity to five fabrics (radirons, neoprene, spandex cushions, poly100%, and vergamo). The padding process with SWCNT was performed, and the alternating current measurement indicated that the most similar alternating current with hydrogel was the Vergamo fabric of SWCNT:=2:1. Furthermore, the usability evaluation of convenience, usability, and psychological satisfaction results in increased usability of EMSCT compared with conventional hydrogel pads.

Muscle Force Potentiation During Constant Electrical Stimulation - Dependence on Pulse-Amplitude and Pulse-Duration of Electrical Stimulation (일정 전기자극하의 근력 상승 - 전기 자극 파형의 펄스 진폭과 펄스폭에 대한 의존성)

  • Kim, Ji-Won;Kwang, Min-Young;Eom, Gwang-Moon
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.55 no.10
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    • pp.458-463
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    • 2006
  • The purpose of this work is to investigate the fundamental properties of the gradual muscle force potentiation. We investigated the dependence of force potentiation on both the pulse-amplitude and the pulse-duration with different ramp-up time. The experimental results showed that the force increment ratio (FIR) during constant electrical stimulation decreased with pulse-amplitude and also with pulse-duration. The FIR was greater with short ramp-up time in both the pulse-amplitude and pulse-width modulation. The feasible mechanism might be that the myosin light chain phosphorylation induces the force potentiation and it occurs only in the fast type muscle fibers which are recruited first. These observations indicate that muscle potentiation must be understood well for the accurate control of muscle force.

A Study on a Modeling of the Inhibitory Reflex Mechanism of Jaw Muscle Induced by Electrical Stimulation (전기자극에 대한 턱근육의 억제반사 메카니즘의 모델링에 관한 연구)

  • 김성환;김태훈;조일준;유세근
    • The Transactions of the Korean Institute of Electrical Engineers D
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    • v.52 no.9
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    • pp.560-567
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    • 2003
  • EMG recordings of the electrical activity of muscle have proved to be a valuable tool in studying muscle function and reflex activity. SP(silent period) is elicited by a electrical stimulation on the chin during isometric contraction of jaw muscle. This paper proposes a model of the inhibitory reflex mechanism of jaw muscle after electrical stimulation. The SPs of jaw muscle after a electrical stimulation to the chin were divided into SP1 and SP2. SP1 is produced by the activation of periodontal receptors. The activation of nociceptors contributes to the SP2. As a result, the EMG signal generated by a proposed a model of inhibitory reflex mechanism is similar to real both EMG signal including SP1 and SP2. The present study have shown differences of SP1 and SP2 induced by inhibitory reflex mechanism.

The Effects of Quadriceps Setting Exercise and Electrical Stimulation on Improvement of Quadriceps Muscle Strength (대퇴사두근 등척성 운동(QSE)과 전기자극(ES)이 대퇴사두근의 근력 증진에 미치는 효과)

  • Choi, Jae-Cheong;Han, Dong-Uck
    • The Journal of Korean Physical Therapy
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    • v.13 no.2
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    • pp.273-280
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    • 2001
  • The purpose of this study was to analyze the effect of quadriceps setting exercise(N= 10) and electrical stimulation(N= 10) on improvement of quadriceps muscle strength. The experiment were performed for 6weeks. The subject of this study was 20 college students(male) who had not any medical problems. The quadriceps muscle strength was evaluated by make use of the KIN COM(Isokinetic dynamometer). The electrical stimulator was used to stimulate the quadriceps muscle. The results were as follows: 1. The mean increment ratio was 29.6% for concentric muscle strength and 36.4% for eccentric muscle strength after quadriceps setting exercise(p<0.05). 2. The mean increment ratio was 21.2% for concentric muscle strength and 24.3% for eccentric muscle strength after electrical stimulation, but did not significantly higher than pre-electrical stimulation In this study, we have found that quadriceps setting exercise on left side affect the improvement of the muscle strength in college students(male). However, electrical stimulation did not affect on the muscle strength.

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The Effects of Low-Frequency Electrical Stimulation on Abdominal Core Muscle Activity and Thickness (저주파 전기자극이 복부 중심근육 활성도 및 두께에 미치는 영향)

  • Lee, H.J.;Lee, J.Y.;Tae, K.S.
    • Journal of rehabilitation welfare engineering & assistive technology
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    • v.7 no.2
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    • pp.85-90
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    • 2013
  • Core muscle is the most crucial for rehabilitation of patients with musculoskeletal and nervous problem, there is pain, imbalance and functional movement disorder of upper and lower extremities. In this study, low-frequency electrical stimulator was developed for the purpose increasing the activity of rectus abdominis (RA) and the thickness of transverse abdominis (TrA), internal obliquus abdominis (IO), and external obliquus abdominis (EO). Fifteen female in their 20's was divided into a experiment groups (traditional electrical stimulation group, developed electrical stimulation group) and control group. Low-frequency electrical stimulation was performed in experimental groups for 4 times a week, 4 weeks. The muscle activities (RA) by EMG and muscle thickness (TrA, IO, EO) by Ultrasonogrphy imaging were measured, respectively. In the result, the muscle activity of RA and muscle thickness of TrA and EO were significantly increased at developed electrical stimulation group (p<.05). Therefore, the developed low-frequency electrical stimulation is useful for rehabilitation with CNS and PNS subjects.

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