Comparison of peak torque, intensity and discomfort generated by neuromuscular electrical stimulation of low and medium frequency

2013 ◽  
Vol 21 (2) ◽  
pp. 167-173 ◽  
Author(s):  
Thiago Yukio Fukuda ◽  
Freddy Beretta Marcondes ◽  
Nayra dos Anjos Rabelo ◽  
Rodrigo Antunes de Vasconcelos ◽  
Claudio Cazarini Junior
Keyword(s):  
Electrical Stimulation ◽  
Neuromuscular Electrical Stimulation ◽  
Peak Torque ◽  
Medium Frequency ◽  
Stimulation Of

Effect Of Neuromuscular Electrical Stimulation On Peak Torque Knee Joint

2014 ◽  
Vol 46 ◽  
pp. 671
Author(s):  
Flávia Medeiros ◽  
Amilton Vieira ◽  
Martim Bottaro ◽  
João Durigan
Keyword(s):  
Electrical Stimulation ◽  
Knee Joint ◽  
Neuromuscular Electrical Stimulation ◽  
Peak Torque

scholarly journals Feedback-controlled stimulation enhances human paralyzed muscle performance

2006 ◽  
Vol 101 (5) ◽  
pp. 1312-1319 ◽  
Author(s):  
Richard K. Shields ◽  
Shauna Dudley-Javoroski ◽  
Keith R. Cole
Keyword(s):  
Electrical Stimulation ◽  
High Frequency ◽  
Neuromuscular Electrical Stimulation ◽  
Peak Torque ◽  
Open Loop ◽  
Muscle Performance ◽  
Constant Frequency ◽  
Extensive Training ◽  
Long Duration ◽  
Repetitive Stress

Chronically paralyzed muscle requires extensive training before it can deliver a therapeutic dose of repetitive stress to the musculoskeletal system. Neuromuscular electrical stimulation, under feedback control, may subvert the effects of fatigue, yielding more rapid and extensive adaptations to training. The purposes of this investigation were to 1) compare the effectiveness of torque feedback-controlled (FDBCK) electrical stimulation with classic open-loop constant-frequency (CONST) stimulation, and 2) ascertain which of three stimulation strategies best maintains soleus torque during repetitive stimulation. When torque declined by 10%, the FDBCK protocol modulated the base stimulation frequency in three ways: by a fixed increase, by a paired pulse (doublet) at the beginning of the stimulation train, and by a fixed decrease. The stimulation strategy that most effectively restored torque continued for successive contractions. This process repeated each time torque declined by 10%. In fresh muscle, FDBCK stimulation offered minimal advantage in maintaining peak torque or mean torque over CONST stimulation. As long-duration fatigue developed in subsequent bouts, FDBCK stimulation became most effective (∼40% higher final normalized torque than CONST). The high-frequency strategy was selected ∼90% of the time, supporting that excitation-contraction coupling compromise and not neuromuscular transmission failure contributed to fatigue of paralyzed muscle. Ideal stimulation strategies may vary according to the site of fatigue; this stimulation approach offered the advantage of online modulation of stimulation strategies in response to fatigue conditions. Based on stress-adaptation principles, FDBCK-controlled stimulation may enhance training effects in chronically paralyzed muscle.

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