Effects of muscle kinematics on surface EMG amplitude  and frequency during fatiguing dynamic contractions

Potvin, Jim R.

doi:10.1152/jappl.1997.82.1.144

Cited by 149 publications

(112 citation statements)

References 35 publications

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“…They concluded/suggested that the EMG data (iEMG and MDF) obtained during isometric and isotonic contractions of the muscles are similar 31) . Frequency spectrum analysis under dynamic conditions have also been investigated during repeated eccentric-concentric muscle contractions of plantar flexors in patients with stroke 32) , in the upper esophageal sphincter-opening muscles during head lift exercise 33) in healthy elderly subjects, and in the biceps brachii of normal young male subjects 34) . Therefore, in our study the frequency spectrum analysis for muscle fatigue was also performed under dynamic conditions during walking.…”

Section: Discussionmentioning

confidence: 99%

The Effect of Microcurrent-Inducing Shoes on Fatigue and Pain in Middle-Aged People with Plantar Fascitis

et al. 2007

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Abstract. When a muscle is used repeatedly for a long time, it often leads to muscular fatigue and muscle soreness. In middle-aged and elderly populations, muscular fatigue and pain during the performance of activities of daily living is a common problem caused by physiological changes in the musculoskeletal system due to the aging process. Microcurrent therapy has been shown to be effective at reducing pain and muscle soreness. For activities such as standing or walking, specially developed shoes (G-man, Busan, South Korea) which are capable of providing microcurrent therapy during the performance of these activities are an advantage as the treatment becomes integrated with the activity being performed. These therapeutic shoes or microcurrent induction shoes could be potentially useful for providing treatment if they were worn during normal activities. The purpose of this study, therefore, was to investigate the effect of these microcurrent induction shoes on pain and muscle fatigue in middle-aged people with plantar fascitis. Subjects were asked to wear their normal shoes and instructed to walk on a treadmill at 2 and 3 km/hr for 10 minutes each. Subjects were then asked to wear the specially designed microcurrent induction shoes for six weeks for at least 4 hours per day during ADL activities such as standing and walking. During the initial evaluation and at the end of the 6 weeks intervention, the electromyographic (EMG) activity of their right tibialis anterior and soleus muscles were recorded, together with their perceived level of foot pain using a Visual Analogue Scale (VAS). The results showed a significant reduction in their VAS scores (p<0.01), and the change in median power frequency of their tibialis anterior EMG recording (p<0.05). In conclusion, this study demonstrated that microcurrent induction shoes were effective in relieving foot pain and muscle fatigue in subjects with plantar fascitis.

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Section: Discussionmentioning

confidence: 99%

The Effect of Microcurrent-Inducing Shoes on Fatigue and Pain in Middle-Aged People with Plantar Fascitis

et al. 2007

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“…Time domain features such as Mean Absolute Value (MAV), number of Zero Crossings (ZC), number of Slope Sign Changes (SSC) and Waveform Length (WL), average EMG amplitude (aEMG), variance (VAR) and Root Mean Square (RMS) were considered for pattern recognition [35,36,37,38]. These features were extracted from 4 channels of sEMG signals during the sketching of each shape.…”

Section: Feature Extractionmentioning

confidence: 99%

Recognition of sketching from surface electromyography

Chen

Zhong

Gong

et al. 2017

Neural Comput & Applic

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The main objective of this study is to recognize sketching precisely and effectively in human computer interaction. A surface electromyography (sEMG) based sketching recognition method is proposed. We conducted an experiment in which we recorded the sEMG signals from the forearm muscles of two participants who were instructed to sketch seven basic one-stroke shapes. Subsequently, seven features of the sEMG time domain were extracted. After reducing data dimensionality using principal component analysis, these features were used as input vectors to a sketching recognition model based on Support Vector Machines (SVM). The performance of this model was compared to two other recognition models based on Multilayer perceptron (MLP) neural networks and Self Organization Feature Map (SOFM) neural networks. The average recognition rates for the seven basic one-stroke shapes of two participants achieved by the SVM-based and MLP-based models were both 98.5% in the test set, which were slightly superior to the performance of the SOFM classifier. Our results demonstrate the feasibility of converting forearm sEMG signals into sketching patterns.

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“…Regra geral, durante um exercício submáximo com predominância de contracções isométricas verifica-se um aumento dos componentes do sinal EMG no domínio do tempo, enquanto as características no domínio da frequência do sinal se deslocam para zonas de baixa frequência (para refs. ver 69,75,95,119) . Tem sido proposto que a resposta dos músculos à fadiga, durante um exercício submáximo, se traduz num aumento do número de unidades motoras recrutadas e/ou na sua sincronização, de forma a compensar a redução da capacidade de gerar força pelas unidades motoras e que esta resposta é responsável pelo aumento da amplitude do sinal EMG (para refs.…”

Section: Modelos De Estudounclassified

“…A compressão do espectro EMG, ou seja, o desvio da frequência de mediana e de média (Hz) para as zonas de baixa frequência durante a fadiga muscular, parece ser influenciado, predominantemente, pela diminuição da velocidade de condução do potencial de acção (para refs. ver 95,119) , em consequência, pelo menos em parte, do aumento da concentrações de ácido láctico durante o exercício e consequente diminuição do pH (71) . Embora a determinação dos componentes do sinal electromiográfico no domínio da frequência seja, habitualmente, efectuada durante a realização de contracções isométricas, diversos estudos têm, recentemente, tentado avaliar estes componentes, assim como os do domínio do tempo, em exercícios dinâmicos, normalmente, realizados em dinamóme-tros isocinéticos, quer no modo concêntrico, quer excêntrico (62,68,71,95) .…”

Section: Modelos De Estudounclassified

Fisiologia da fadiga muscular. Delimitação conceptual, modelos de estudo e mecanismos de fadiga de origem central e periférica

Ascensão¹,

Magalhães²,

Oliveira³

et al. 2003

RPCD

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RESUMOO tecido muscular esquelético dos mamíferos possui a capacidade de produzir níveis elevados de força quando activado. A incapacidade de produzir repetidamente no tempo um determinado nível de força ou potência muscular designa-se por fadiga neuromuscular, fenómeno que pode manifestar-se de forma aguda e que pode persistir durante dias ou mesmo semanas. A etiologia da fadiga muscular tem atraído o interesse dos investigadores desde há mais de um século. Contudo, os seus agentes e locais definitivos permanecem ainda por identificar. As causas da fadiga muscular durante o exercício residem nas regiões corticais e sub-corticais (fadiga de origem central) e ao nível do tecido muscular esquelético (fadiga de origem periféri-ca). Os objectivos desta revisão foram: (i) definir o conceito de fadiga, enumerando algumas áreas em que este fenómeno tem sido estudado; (ii) diferenciar os modelos experimentais em que a fadiga tem sido estudada, com particular destaque para os estudos in vivo recorrendo à electromiografia; (iii) analisar os principais factores descritos na literatura relacionados com a fadiga central, nomeadamente a relação desta com a variação de alguns neurotransmissores e alguns aminoácidos de cadeia ramificada; (iv) diferenciar e explicar os principais tipos de fadiga periférica descritos na literatura e (v) analisar os mecanismos indutores de fadiga com origem predominantemente periférica, com particular destaque para o papel da deplecção de alguns substratos energéticos necessários para a síntese de ATP e da variação das concentrações intracelulares de cálcio, H + , lactato, fosfato e ADP. Parece razoável associar, pelo menos em parte, a fadiga de origem predominantemente central com a variação das concentrações de glicose sanguínea, de aminoácidos de cadeia ramificada e da síntese de alguns neurotransmissores. Em relação à fadiga periférica, as evidências experimentais têm demonstrado que reduções nas concentrações mioplasmáticas de cálcio comprometem a tensão gerada pelas fibras durante contracções musculares induzidas por estimulações de frequência elevada. As alterações nas concentrações de H + , lactato, Pi, ADP ou ATP, embora influenciem a produção de força pelas fibras musculares, não parecem apresentar-se, per se, como factores determinantes da fadiga. Palavras

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Effects of muscle kinematics on surface EMG amplitude and frequency during fatiguing dynamic contractions

Cited by 149 publications

References 35 publications

The Effect of Microcurrent-Inducing Shoes on Fatigue and Pain in Middle-Aged People with Plantar Fascitis

The Effect of Microcurrent-Inducing Shoes on Fatigue and Pain in Middle-Aged People with Plantar Fascitis

Recognition of sketching from surface electromyography

Fisiologia da fadiga muscular. Delimitação conceptual, modelos de estudo e mecanismos de fadiga de origem central e periférica

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