Cortico-motoneuronal output to intrinsic hand muscles is differentially influenced by static changes in shoulder positions.

Cortico-motoneuronal output to intrinsic hand muscles is differentially influenced by static changes in shoulder positions. Research Abstract Details 

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Cortico-motoneuronal output to intrinsic hand muscles is differentially influenced by static changes in shoulder positions. Abstract Text:

F Dominici,T Popa,F Ginanneschi,R Mazzocchio,A Rossi,

We investigated whether shoulder position influenced the recruitment properties of the abductor digiti minimi muscle (ADM) and first dorsal interosseous muscle (FDI). ADM and FDI motor evoked potentials (MEPs) in response to transcranial magnetic stimulation (TMS) were obtained in seven healthy volunteers at two different static positions of the shoulder joint (30 degrees adduction vs 30 degrees abduction) while the arm was passively supported at shoulder level (90 degrees in the horizontal plane) and the elbow joint was fixed at 90 degrees . ADM and FDI voluntary activity was also examined during (1) externally paced finger abductions at 2 Hz in the two different shoulder positions (EMG(ADM) and EMG(FDI) was back-averaged time-locked to the end of finger abduction) and (2) maximal voluntary abduction of the little finger and the index finger. Maximal EMG power and force were analysed in the two shoulder positions. H-reflexes from ADM and FDI were also obtained in two subjects. The ADM stimulus-response curve to TMS showed that the slope and plateau level were significantly reduced with the shoulder at 30 degrees abduction. In contrast, the FDI stimulus-response curve to TMS was not influenced by shoulder position. The back-averaged EMG(ADM) showed a significant decrease in peak amplitude and area with the shoulder at 30 degrees abduction, while no change in EMG(FDI) was observed under the same condition. Similarly, maximal EMG(ADM) and force exertion by the little finger were significantly reduced with the shoulder at 30 degrees abduction, while no such effect was observed for FDI. ADM H-reflex, but not FDI, was also decreased with shoulder abduction. These results indicate that the corticospinal pathway to ADM is less accessible to TMS and to voluntary command when the shoulder is placed at 30 degrees abduction. In contrast, activation of FDI, whether by TMS or by volition, is not influenced by shoulder position. This finding suggests that there are differences in the corticospinal innervation to ADM and FDI, possibly due to the different role of these muscles in hand function.

Cortico-motoneuronal output to intrinsic hand muscles is differentially influenced by static changes in shoulder positions. Publishing Authors By Initials

F Dominici,T Popa,F Ginanneschi,R Mazzocchio,A Rossi,

For similar psychological phenomena and processes: mental processes: volition research abstracts see: psychological phenomena and processes: mental processes: volition research

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Cortico-motoneuronal output to intrinsic hand muscles is differentially influenced by static changes in shoulder positions. Journal Published:

PUBLICATION TYPE: Research Support, Non-U.S. Gov

Journal: Experimental brain research. Experimentelle Hirnfo

VOLUME: 164

Page Numbers: 500-4

Journal Abbreviation:

ISSN: 0014-4819

DAY: 10

MONTH: 05

YEAR: 2005

Cortico-motoneuronal output to intrinsic hand muscles is differentially influenced by static changes in shoulder positions. Information

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LANGUAGE: eng

NlmUniqueID: 43312

Cortico-motoneuronal output to intrinsic hand muscles is differentially influenced by static changes in shoulder positions. Keywords Mesh Terms:

KEYWORDS: Volition

MESH TERMS: physiology

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Grant and Affiliation Information for Cortico-motoneuronal output to intrinsic hand muscles is differentially influenced by static changes in shoulder positions.

AFFILIATION: Sezione di Neurofisiologia Clinica, Dipartimento di Scienze Neurologiche e del Comportamento, Università di Siena, Policlinico Le Scotte Viale Bracci, 53100, Siena, Italy.

Country: Germany

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MEDLINETA: Exp Brain Res

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