Dependence of the mean power frequency of the electromyogram on muscle force and fibre type

Gerdle, Björn; Henriksson-Larsén, Karin; Lorentzon, Ronny; Wretling, M.-L.

doi:10.1111/j.1748-1716.1991.tb09180.x

Cited by 179 publications

(139 citation statements)

References 37 publications

Supporting

Mentioning

114

Contrasting

Unclassified

Order By: Relevance

“…In contrast, when SCS L4 of the dermatome decreased rmsEMG of VL, it seems that type 2 fibers (HT-MUs) or type 1 fibers (LT-MUs) deep in the muscle were activated. Consequently, our results support the findings of other researchers that there are changes in EMG and proportion of fiber types between deep and surface area muscle 16,33) .…”

Section: Discussionsupporting

confidence: 83%

Skin Cold Stimulation of the Dermatome Modulates Activation of the Quadriceps

et al. 2012

View full text Add to dashboard Cite

Abstract. [Purpose] To examine electromyographic (EMG) activity change during dynamic contraction of the quadriceps with skin cold stimulation (SCS) over the vastus lateralis (VL) and L4 dermatome area on the medial side of the lower leg. [Subjects and Methods] Seventeen healthy male volunteers participated. Dynamic knee extension was performed at 15% maximum voluntary contraction (MVC). SCS is a method used to cool the skin to 25 °C using a gel-cooling pad. The SCS method has no effect on the muscle below the cooled skin. Subjects performed dynamic knee extension under 4 randomly selected conditions: (1) SCS of skin over the VL (SCS VL ), (2)without SCS of skin over the VL (non-SCS VL ), (3) SCS of L4 dermatome area on the medial side of the lower leg (SCS L4 ), and (4) without SCS of L4 dermatome area on the medial side of the lower leg (non-SCS L4 ). Surface EMG from the rectus femoris (RF), VL, and vastus medialis (VM) were recorded using miniature electrodes.[Results] The root mean square of the EMG (rmsEMG) of the VL with SCS was significantly greater than activation without SCS, but was decreased by SCS L4 . However, the activity of RF and VM did not change in any condition.[Conclusion] Our results suggest that the influence of cutaneous input can demonstrably modulate muscle activation.

show abstract

Section: Discussionsupporting

confidence: 83%

Skin Cold Stimulation of the Dermatome Modulates Activation of the Quadriceps

et al. 2012

View full text Add to dashboard Cite

show abstract

“…A redução nos valores dos parâmetros do domínio da frequência adquirido na análise da EMGs reflete uma redução na velocidade de condução da fibra muscular e também no recrutamento das unidades motoras, ou seja, indicativo de início de fadiga muscular [16,17]. Estes são exibidos antes mesmo de qualquer modificação de força [13].…”

Section: Discussionunclassified

“…De acordo com a Tabela 2, nesta avaliação, a atividade eletromiográfica do músculo ECOM apresentou menor frequência de disparo das unidades motoras das fibras musculares do tipo II, ou seja, redução nos valores da variável F mediana para o grupo 1 (DBP) em relação ao grupo 2 (controle), que mostra que lactentes com DBP apresentam menor número de fibras musculares do tipo II, funcionantes, sendo este um indicativo de fadiga muscular [16,17].…”

Section: Tabela 1 Características Dos Lactentes Dbp -Displasia Broncunclassified

Impacto Da Displasia Broncopulmonar Na Musculatura Respiratória Acessória De Lactentes.

DArcadia¹,

Oliveira²,

Pereira³

et al. 2018

Anais Do v Congresso Brasileiro De Eletromiografia E Cinesiologia E X Simpósio De Engenharia Biomédica

View full text Add to dashboard Cite

Resumo:Introdução: A displasia broncopulmonar (DBP) é uma doença pulmonar crônica que acomete geralmente prematuros que necessitaram de oxigênio por mais de 28 dias de vida. Existe na literatura pouca informação sobre a forma como a DBP pode afetar os músculos respiratórios, bem como a possível indução de fadiga sobre esses músculos. Diante desse contexto, nossa hipótese nesta pesquisa foi avaliar a possibilidade de fadiga na musculatura respiratória acessória ( IntroduçãoA Displasia broncopulmonar (DBP) é considerada uma doença pulmonar crônica que acomete neonatos que permanecem com dependência de oxigênio, em concentrações acima de 21%, por um período igual ou superior a 28 dias de vida [1]. Esta doença é, em potencial, uma desordem do desenvolvimento do sistema respiratório do recém-nascido pré-termo, na qual, o pulmão ainda imaturo, não atinge toda sua estrutura morfológica e funcional, que resulta na formação de grandes alvéolos[2] com superfície reduzida de trocas gasosas[3] e por consequência gera uma obstrução do fluxo aéreo pulmonar e uma sobrecarga dos músculos principais da respiração na tentativa de vencer a resistência das vias aéreas e adequar a ventilação pulmonar [4,5].Assim, os músculos acessórios da respiração são acionados, permitindo elevação da caixa torácica na inspiração [6][7][8], repouso dos músculos diafragma e intercostal interno, contração muscular abdominal e expiração forçada, além da mobilização de secreções e prevenção de atelectasias [7,8]. Esta situação deve ser considerada, pois afeta justamente a função do diafragma e da MRA [7], podendo interferir diretamente na postura corporal, gerando restrições na mobilidade

show abstract

“…The decreased conduction speed of the muscle fibers caused by the muscle fatigue results in a reduction in Type II muscle fiber activation, with an increase Type I muscle fiber activation. This results in the MDF shifting to the low frequency band [24][25][26][27][28][29] . Traditionally, frequency spectrum analysis has been carried out by recording the EMG signals during isometric contractions.…”

Section: Discussionmentioning

confidence: 99%

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

et al. 2007

View full text Add to dashboard Cite

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.

show abstract

Dependence of the mean power frequency of the electromyogram on muscle force and fibre type

Cited by 179 publications

References 37 publications

Skin Cold Stimulation of the Dermatome Modulates Activation of the Quadriceps

Skin Cold Stimulation of the Dermatome Modulates Activation of the Quadriceps

Impacto Da Displasia Broncopulmonar Na Musculatura Respiratória Acessória De Lactentes.

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

Contact Info

Product

Resources

About