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Twitch potentiation induced by two different modalities of neuromuscular electrical stimulation: Implications for motor unit recruitment
Author(s) -
Regina Dias Da Silva Sarah,
Neyroud Daria,
Maffiuletti Nicola A.,
Gondin Julien,
Place Nicolas
Publication year - 2015
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.24315
Subject(s) - motor unit , stimulation , long term potentiation , muscle contraction , electromyography , medicine , tibial nerve , contraction (grammar) , neuromuscular transmission , anesthesia , physical medicine and rehabilitation , psychology , anatomy , receptor
: We tested the hypothesis that twitch potentiation would be greater following conventional (CONV) neuromuscular electrical stimulation (50‐µs pulse width and 25‐H z frequency) compared with wide‐pulse high‐frequency (WPHF) neuromuscular electrical stimulation (1‐ms, 100‐H z ) and voluntary (VOL) contractions, because of specificities in motor unit recruitment (random in CONV vs. random and orderly in WPHF vs. orderly in VOL). Methods : A single twitch was evoked by means of tibial nerve stimulation before and 2 s after CONV, WPHF, and VOL conditioning contractions of the plantar flexors (intensity: 10% maximal voluntary contraction; duration: 10 s) in 13 young healthy subjects. Results : Peak twitch increased ( P < 0.05) after CONV (+4.5 ± 4.0%) and WPHF (+3.3 ± 5.9%), with no difference between the 2 modalities, whereas no changes were observed after VOL (+0.8 ± 2.6%). Conclusions : Our results demonstrate that presumed differences in motor unit recruitment between WPHF and CONV do not seem to influence twitch potentiation results. Muscle Nerve 51: 412–418, 2015