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The Effect of Motor Imagery on Spinal Segmental Excitability

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Bibliographische Detailangaben
Zeitschriftentitel: The Journal of Neuroscience
Personen und Körperschaften: Li, Sheng, Kamper, Derek G., Stevens, Jennifer A., Rymer, William Z.
In: The Journal of Neuroscience, 24, 2004, 43, S. 9674-9680
Format: E-Article
Sprache: Englisch
veröffentlicht:
Society for Neuroscience
Schlagwörter:
General Neuroscience
author_facet Li, Sheng
Kamper, Derek G.
Stevens, Jennifer A.
Rymer, William Z.
Li, Sheng
Kamper, Derek G.
Stevens, Jennifer A.
Rymer, William Z.
author Li, Sheng
Kamper, Derek G.
Stevens, Jennifer A.
Rymer, William Z.
spellingShingle Li, Sheng
Kamper, Derek G.
Stevens, Jennifer A.
Rymer, William Z.
The Journal of Neuroscience
The Effect of Motor Imagery on Spinal Segmental Excitability
General Neuroscience
author_sort li, sheng
spelling Li, Sheng Kamper, Derek G. Stevens, Jennifer A. Rymer, William Z. 0270-6474 1529-2401 Society for Neuroscience General Neuroscience http://dx.doi.org/10.1523/jneurosci.2781-04.2004 <jats:p>The purpose of this study was to investigate the effect of motor imagery on spinal segmental excitability by recording the reflex responses to externally applied stretch of the extrinsic finger flexors and extensors during the performance of an imaginary task. Nine young healthy subjects performed a series of imagined flexion-extension movements of the fingers. Muscle stretch was imposed concurrently by applying rotations of the metacarpophalangeal joints at 100, 300, or 500°/sec. Three of the nine tested subjects also generated 0.2 Newton meter voluntary flexion torque in preloading tasks before stretch.</jats:p><jats:p>At 300°/sec stretch, electromyogram (EMG) and torque reflex responses, which were observed in the finger flexors in four of nine subjects during motor imagery, were activated at a short latency (38.6 ± 10.6 msec). This latency was similar to that recorded during a stretch of preactivated flexor muscles (34.4 ± 3.6 msec), in which motoneurons are already suprathreshold and in which monosynaptic effects of muscle afferents are likely to be discernable. In a similar manner, for stretches imposed at 500°/sec, responses to stretch of the flexors were observed in all five tested subjects in imaginary flexion tasks at very short latencies (26.4 ± 3.7 msec), again similar to those induced by tendon taps (22.8 ± 1.2 msec). No EMG response was observed at rest during stretches.</jats:p><jats:p>These observations support the view that effects must have been mediated by imagery-related subthreshold activation of spinal motoneurons and/or interneurons, rather than by long-latency transcortical reflex responses. We conclude that motor imagery has a potent effect on the excitability of spinal reflex pathways.</jats:p> The Effect of Motor Imagery on Spinal Segmental Excitability The Journal of Neuroscience
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title The Effect of Motor Imagery on Spinal Segmental Excitability
title_unstemmed The Effect of Motor Imagery on Spinal Segmental Excitability
title_full The Effect of Motor Imagery on Spinal Segmental Excitability
title_fullStr The Effect of Motor Imagery on Spinal Segmental Excitability
title_full_unstemmed The Effect of Motor Imagery on Spinal Segmental Excitability
title_short The Effect of Motor Imagery on Spinal Segmental Excitability
title_sort the effect of motor imagery on spinal segmental excitability
topic General Neuroscience
url http://dx.doi.org/10.1523/jneurosci.2781-04.2004
publishDate 2004
physical 9674-9680
description <jats:p>The purpose of this study was to investigate the effect of motor imagery on spinal segmental excitability by recording the reflex responses to externally applied stretch of the extrinsic finger flexors and extensors during the performance of an imaginary task. Nine young healthy subjects performed a series of imagined flexion-extension movements of the fingers. Muscle stretch was imposed concurrently by applying rotations of the metacarpophalangeal joints at 100, 300, or 500°/sec. Three of the nine tested subjects also generated 0.2 Newton meter voluntary flexion torque in preloading tasks before stretch.</jats:p><jats:p>At 300°/sec stretch, electromyogram (EMG) and torque reflex responses, which were observed in the finger flexors in four of nine subjects during motor imagery, were activated at a short latency (38.6 ± 10.6 msec). This latency was similar to that recorded during a stretch of preactivated flexor muscles (34.4 ± 3.6 msec), in which motoneurons are already suprathreshold and in which monosynaptic effects of muscle afferents are likely to be discernable. In a similar manner, for stretches imposed at 500°/sec, responses to stretch of the flexors were observed in all five tested subjects in imaginary flexion tasks at very short latencies (26.4 ± 3.7 msec), again similar to those induced by tendon taps (22.8 ± 1.2 msec). No EMG response was observed at rest during stretches.</jats:p><jats:p>These observations support the view that effects must have been mediated by imagery-related subthreshold activation of spinal motoneurons and/or interneurons, rather than by long-latency transcortical reflex responses. We conclude that motor imagery has a potent effect on the excitability of spinal reflex pathways.</jats:p>
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author Li, Sheng, Kamper, Derek G., Stevens, Jennifer A., Rymer, William Z.
author_facet Li, Sheng, Kamper, Derek G., Stevens, Jennifer A., Rymer, William Z., Li, Sheng, Kamper, Derek G., Stevens, Jennifer A., Rymer, William Z.
author_sort li, sheng
container_issue 43
container_start_page 9674
container_title The Journal of Neuroscience
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description <jats:p>The purpose of this study was to investigate the effect of motor imagery on spinal segmental excitability by recording the reflex responses to externally applied stretch of the extrinsic finger flexors and extensors during the performance of an imaginary task. Nine young healthy subjects performed a series of imagined flexion-extension movements of the fingers. Muscle stretch was imposed concurrently by applying rotations of the metacarpophalangeal joints at 100, 300, or 500°/sec. Three of the nine tested subjects also generated 0.2 Newton meter voluntary flexion torque in preloading tasks before stretch.</jats:p><jats:p>At 300°/sec stretch, electromyogram (EMG) and torque reflex responses, which were observed in the finger flexors in four of nine subjects during motor imagery, were activated at a short latency (38.6 ± 10.6 msec). This latency was similar to that recorded during a stretch of preactivated flexor muscles (34.4 ± 3.6 msec), in which motoneurons are already suprathreshold and in which monosynaptic effects of muscle afferents are likely to be discernable. In a similar manner, for stretches imposed at 500°/sec, responses to stretch of the flexors were observed in all five tested subjects in imaginary flexion tasks at very short latencies (26.4 ± 3.7 msec), again similar to those induced by tendon taps (22.8 ± 1.2 msec). No EMG response was observed at rest during stretches.</jats:p><jats:p>These observations support the view that effects must have been mediated by imagery-related subthreshold activation of spinal motoneurons and/or interneurons, rather than by long-latency transcortical reflex responses. We conclude that motor imagery has a potent effect on the excitability of spinal reflex pathways.</jats:p>
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spelling Li, Sheng Kamper, Derek G. Stevens, Jennifer A. Rymer, William Z. 0270-6474 1529-2401 Society for Neuroscience General Neuroscience http://dx.doi.org/10.1523/jneurosci.2781-04.2004 <jats:p>The purpose of this study was to investigate the effect of motor imagery on spinal segmental excitability by recording the reflex responses to externally applied stretch of the extrinsic finger flexors and extensors during the performance of an imaginary task. Nine young healthy subjects performed a series of imagined flexion-extension movements of the fingers. Muscle stretch was imposed concurrently by applying rotations of the metacarpophalangeal joints at 100, 300, or 500°/sec. Three of the nine tested subjects also generated 0.2 Newton meter voluntary flexion torque in preloading tasks before stretch.</jats:p><jats:p>At 300°/sec stretch, electromyogram (EMG) and torque reflex responses, which were observed in the finger flexors in four of nine subjects during motor imagery, were activated at a short latency (38.6 ± 10.6 msec). This latency was similar to that recorded during a stretch of preactivated flexor muscles (34.4 ± 3.6 msec), in which motoneurons are already suprathreshold and in which monosynaptic effects of muscle afferents are likely to be discernable. In a similar manner, for stretches imposed at 500°/sec, responses to stretch of the flexors were observed in all five tested subjects in imaginary flexion tasks at very short latencies (26.4 ± 3.7 msec), again similar to those induced by tendon taps (22.8 ± 1.2 msec). No EMG response was observed at rest during stretches.</jats:p><jats:p>These observations support the view that effects must have been mediated by imagery-related subthreshold activation of spinal motoneurons and/or interneurons, rather than by long-latency transcortical reflex responses. We conclude that motor imagery has a potent effect on the excitability of spinal reflex pathways.</jats:p> The Effect of Motor Imagery on Spinal Segmental Excitability The Journal of Neuroscience
spellingShingle Li, Sheng, Kamper, Derek G., Stevens, Jennifer A., Rymer, William Z., The Journal of Neuroscience, The Effect of Motor Imagery on Spinal Segmental Excitability, General Neuroscience
title The Effect of Motor Imagery on Spinal Segmental Excitability
title_full The Effect of Motor Imagery on Spinal Segmental Excitability
title_fullStr The Effect of Motor Imagery on Spinal Segmental Excitability
title_full_unstemmed The Effect of Motor Imagery on Spinal Segmental Excitability
title_short The Effect of Motor Imagery on Spinal Segmental Excitability
title_sort the effect of motor imagery on spinal segmental excitability
title_unstemmed The Effect of Motor Imagery on Spinal Segmental Excitability
topic General Neuroscience
url http://dx.doi.org/10.1523/jneurosci.2781-04.2004