Neuromuscular fatigue after low‐ and medium‐frequency electrical stimulation in healthy adults

ABSTRACT Introduction: In this study we investigated fatigue origins induced by low‐frequency pulsed current (PC) and medium‐frequency current (MF) neuromuscular electrical stimulation (NMES) after a clinical‐like session. Methods: Eleven healthy men randomly underwent 2 NMES sessions, PC and MF, on...

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Published in:Muscle & nerve 2018-08, Vol.58 (2), p.293-299
Main Authors: De Oliveira, Pedro Ferreira Alves, Durigan, João Luiz Quagliotti, Modesto, Karenina Arrais Guida, Bottaro, Martim, Babault, Nicolas
Format: Article
Language:English
Subjects:
Adults
central fatigue
Contraction
Discomfort
Electrical stimuli
Electromyography
evoked torque
Fatigue
Knee
Muscle contraction
Muscle strength
Muscular fatigue
neurostimulation
peripheral fatigue
Pulsed current
quadriceps
Quadriceps muscle
Stimulation
Torque
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Summary:ABSTRACT Introduction: In this study we investigated fatigue origins induced by low‐frequency pulsed current (PC) and medium‐frequency current (MF) neuromuscular electrical stimulation (NMES) after a clinical‐like session. Methods: Eleven healthy men randomly underwent 2 NMES sessions, PC and MF, on quadriceps muscle (15‐minute duration, 6 seconds on and 18 seconds off). Maximal voluntary contraction (MVC), central activation ratio (CAR), vastus lateralis electromyographic activity (EMG), and evoked contractile properties were determined before and after the sessions. Evoked torque and discomfort during the sessions were also measured. Results: Both currents produced decreases in MVC, EMG, and evoked contractile properties after the sessions. No difference was found between currents for all variables (P > 0.05). Evoked torque during sessions decreased (P  0.05). Discussion: Both currents induced similar neuromuscular fatigue. Clinicians can choose either PC or MF and expect similar treatment effects when the goal is to generate gains in muscle strength. Muscle Nerve 58: 293–299, 2018
ISSN:0148-639X
1097-4598
DOI:10.1002/mus.26143