Abstract
We investigated the interaction between relaxation and contraction for remote, ipsilateral muscles of the hand and foot (wrist extensor/ankle dorsiflexor). Subjects sat in an armchair and were able to freely move their right hand and foot. They performed eight tasks: (1) wrist extension from a flexed (relaxed) position, (2) ankle dorsiflexion from a plantarflexed (relaxed) position, (3) wrist relaxation from an extended position, (4) ankle relaxation from a moderately dorsiflexed position. The remaining tasks involved (5) simultaneous performance of tasks 1 and 2, (6) 3 and 4, (7) 1 and 4, and (8) 2 and 3. Subjects performed each task as fast as possible after hearing a start signal. They were instructed not to activate antagonistic muscles in the tasks involving relaxation. When contraction of the wrist flexor/ankle dorsiflexor was concurrent with relaxation of the ipsilateral limb (ankle dorsiflexor/wrist extensor), the reaction time of contraction as observed in electromyography (EMG) activities in the wrist extensor/ankle dorsiflexor became longer and the EMG activities became smaller. Our findings suggest that muscle relaxation in one limb interferes with smooth movement of muscle contraction in the ipsilateral limb.
| Original language | English |
|---|---|
| Pages (from-to) | 181-189 |
| Number of pages | 9 |
| Journal | Experimental Brain Research |
| Volume | 232 |
| Issue number | 1 |
| DOIs | |
| Publication status | Published - 2014 Jan |
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Keywords
- Coordination
- Electromyography
- Inhibition
- Reaction time
ASJC Scopus subject areas
- Neuroscience(all)
Cite this
Interaction between simultaneous contraction and relaxation in different limbs. / Kato, Koki; Muraoka, Tetsuro; Higuchi, Takatoshi; Mizuguchi, Nobuaki; Kanosue, Kazuyuki.
In: Experimental Brain Research, Vol. 232, No. 1, 01.2014, p. 181-189.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Interaction between simultaneous contraction and relaxation in different limbs
AU - Kato, Koki
AU - Muraoka, Tetsuro
AU - Higuchi, Takatoshi
AU - Mizuguchi, Nobuaki
AU - Kanosue, Kazuyuki
PY - 2014/1
Y1 - 2014/1
N2 - We investigated the interaction between relaxation and contraction for remote, ipsilateral muscles of the hand and foot (wrist extensor/ankle dorsiflexor). Subjects sat in an armchair and were able to freely move their right hand and foot. They performed eight tasks: (1) wrist extension from a flexed (relaxed) position, (2) ankle dorsiflexion from a plantarflexed (relaxed) position, (3) wrist relaxation from an extended position, (4) ankle relaxation from a moderately dorsiflexed position. The remaining tasks involved (5) simultaneous performance of tasks 1 and 2, (6) 3 and 4, (7) 1 and 4, and (8) 2 and 3. Subjects performed each task as fast as possible after hearing a start signal. They were instructed not to activate antagonistic muscles in the tasks involving relaxation. When contraction of the wrist flexor/ankle dorsiflexor was concurrent with relaxation of the ipsilateral limb (ankle dorsiflexor/wrist extensor), the reaction time of contraction as observed in electromyography (EMG) activities in the wrist extensor/ankle dorsiflexor became longer and the EMG activities became smaller. Our findings suggest that muscle relaxation in one limb interferes with smooth movement of muscle contraction in the ipsilateral limb.
AB - We investigated the interaction between relaxation and contraction for remote, ipsilateral muscles of the hand and foot (wrist extensor/ankle dorsiflexor). Subjects sat in an armchair and were able to freely move their right hand and foot. They performed eight tasks: (1) wrist extension from a flexed (relaxed) position, (2) ankle dorsiflexion from a plantarflexed (relaxed) position, (3) wrist relaxation from an extended position, (4) ankle relaxation from a moderately dorsiflexed position. The remaining tasks involved (5) simultaneous performance of tasks 1 and 2, (6) 3 and 4, (7) 1 and 4, and (8) 2 and 3. Subjects performed each task as fast as possible after hearing a start signal. They were instructed not to activate antagonistic muscles in the tasks involving relaxation. When contraction of the wrist flexor/ankle dorsiflexor was concurrent with relaxation of the ipsilateral limb (ankle dorsiflexor/wrist extensor), the reaction time of contraction as observed in electromyography (EMG) activities in the wrist extensor/ankle dorsiflexor became longer and the EMG activities became smaller. Our findings suggest that muscle relaxation in one limb interferes with smooth movement of muscle contraction in the ipsilateral limb.
KW - Coordination
KW - Electromyography
KW - Inhibition
KW - Reaction time
UR - http://www.scopus.com/inward/record.url?scp=84891868146&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=84891868146&partnerID=8YFLogxK
U2 - 10.1007/s00221-013-3730-y
DO - 10.1007/s00221-013-3730-y
M3 - Article
C2 - 24132527
AN - SCOPUS:84891868146
VL - 232
SP - 181
EP - 189
JO - Experimental Brain Research
JF - Experimental Brain Research
SN - 0014-4819
IS - 1
ER -