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Effects of stimulation frequency, amplitude, and impulse width on muscle fatigue
Author(s) -
Behringer Michael,
Grützner Sebastian,
Montag Johannes,
McCourt Molly,
Ring Matthias,
Mester Joachim
Publication year - 2016
Publication title -
muscle and nerve
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.025
H-Index - 145
eISSN - 1097-4598
pISSN - 0148-639X
DOI - 10.1002/mus.24893
Subject(s) - stimulation , medicine , impulse (physics) , amplitude , crossover study , intensity (physics) , nuclear magnetic resonance , physics , optics , alternative medicine , pathology , quantum mechanics , placebo
: We investigated the effect of stimulation intensity (in percent of maximal tolerated stimulation current, mTSC), frequency, and impulse width on muscle fatigue. Methods : Using a randomized crossover design, 6 parameter combinations (80% mTSC, 80 H z , 400 μs; 60% mTSC, 80 H z , 400 μs; 80% mTSC, 20 H z , 400 μs; 60% mTSC, 20 H z , 400 μs; 80% mTSC, 80 H z , 150 μs; 60% mTSC, 80 H z , 150 μs) were tested in both legs of 13 athletic men (age 26 ± 2.3). The slope of the linear regression line over all tetani (FIS) and the number of tetani whose force was above 50% of the initial tetanus (FIN) were used to quantify fatigue. Results : FIS and FIN were significantly lower in high‐frequency protocols. No effects on FIS and FIN were found for intensity and impulse width. Conclusions : Stimulation frequency, but not impulse width or intensity, affected fatigue kinetics. Muscle Nerve 53 : 608–616, 2016