| Full text | |
| Author(s): |
Suzuki, Shinya
[1, 2]
;
Nakajima, Tsuyoshi
[1]
;
Futatsubashi, Genki
[2, 3]
;
Mezzarane, Rinaldo A.
[4, 5, 6]
;
Ohtsuka, Hiroyuki
[7]
;
Ohki, Yukari
[1]
;
Komiyama, Tomoyoshi
[2, 6]
Total Authors: 7
|
| Affiliation: | [1] Kyorin Univ, Sch Med, Dept Integrat Physiol, 6-20-2 Shinkawa, Mitaka, Tokyo 1818611 - Japan
[2] Tokyo Gakugei Univ, United Grad Sch Educ, Div Hlth & Sports Educ, Tokyo - Japan
[3] Jobu Univ, Fac Business & Informat Sci, Gunma - Japan
[4] Univ Brasilia, Coll Phys Educ, Lab Signal Proc & Motor Control, Brasilia, DF - Brazil
[5] Univ Sao Paulo, EPUSP, PTC, Biomed Engn Lab, Sao Paulo - Brazil
[6] Chiba Univ, Fac Educ, Div Hlth & Sports Sci, Chiba - Japan
[7] Hlth Sci Univ Hokkaido, Dept Phys Therapy, Sch Rehabil Sci, Sapporo, Hokkaido - Japan
Total Affiliations: 7
|
| Document type: | Journal article |
| Source: | Experimental Brain Research; v. 234, n. 2, p. 617-626, FEB 2016. |
| Web of Science Citations: | 2 |
| Abstract | |
We previously demonstrated that non-noxious electrical stimulation of the cutaneous nerve innervating the contralateral foot modified the excitability of the Hoffmann (H-) reflex in the soleus muscle (SOL) in a task-dependent manner during standing and walking in humans. To date, however, it remains unclear how the crossed conditioning effect on the SOL H-reflex from the contralateral foot is modified during the various phases of walking. We sought to answer this question in the present study. The SOL H-reflex was evoked in healthy volunteers by an electrical test stimulation (TS) of the right (ipsilateral) posterior tibial nerve at five different phases during treadmill walking (4 km/h). A non-noxious electrical stimulation was delivered to the superficial peroneal nerve of the left (contralateral) ankle similar to 100 ms before the TS as a conditioning stimulation (CS). This CS significantly suppressed the H-reflex amplitude during the early stance phase, whereas the same CS significantly facilitated the H-reflex amplitude during the late stance phase. The CS alone did not produce detectable changes in the full-wave rectified electromyogram of the SOL. This result indicates that presynaptic mechanisms driven by the activation of low-threshold cutaneous afferents in the contralateral foot play a role in regulating the transmission between the Ia terminal and motoneurons in a phase-dependent manner. The modulation pattern of the crossed conditioning effect on the SOL H-reflex may be functionally relevant for the left-right coordination of leg movements during bipedal walking. (AU) | |
| FAPESP's process: | 12/05304-5 - Effects of cutaneous activation on contralateral reflex modulation during gait in humans |
| Grantee: | Rinaldo André Mezzarane |
| Support Opportunities: | Scholarships abroad - Research Internship - Post-doctor |