Twitch potentiation induced by two different modalities of neuromuscular electrical stimulation: Implications for motor unit recruitment | Zendy

Regina Dias Da Silva Sarah | Zendy; Neyroud Daria | Zendy; Maffiuletti Nicola A. | Zendy; Gondin Julien | Zendy; Place Nicolas | Zendy

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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

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