Abstract
| Original language | Undefined |
|---|---|
| Article number | 10.1002/mus.21090 |
| Pages (from-to) | 177-185 |
| Number of pages | 9 |
| Journal | Muscle & nerve |
| Volume | 39 |
| Issue number | 2 |
| DOIs | |
| Publication status | Published - 25 Nov 2009 |
Keywords
- motor unit characteristics
- multi-channel array EMG
- EWI-15140
- IR-62755
- High-density surface EMG
- Stroke patients
- METIS-265194
- Motor unit action potentials
Cite this
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Motor unit properties of biceps brachii in chronic stroke patients assessed with high-density surface EMG. / Kallenberg, L.A.C.; Hermens, Hermanus J.
In: Muscle & nerve, Vol. 39, No. 2, 10.1002/mus.21090, 25.11.2009, p. 177-185.Research output: Contribution to journal › Article › Academic › peer-review
TY - JOUR
T1 - Motor unit properties of biceps brachii in chronic stroke patients assessed with high-density surface EMG
AU - Kallenberg, L.A.C.
AU - Hermens, Hermanus J.
N1 - 10.1002/mus.21090
PY - 2009/11/25
Y1 - 2009/11/25
N2 - The aim of this study was to investigate motor unit (MU) characteristics of the biceps brachii in post-stroke patients, using high-density surface electromyography (sEMG). Eighteen chronic hemiparetic stroke patients took part. The Fugl-Meyer score for the upper extremity was assessed. Subjects performed an isometric step contraction consisting of force levels from 5 to 50% MVC while sEMG of the biceps brachii was recorded with a two dimensional 16-channel electrode array. This was repeated for both sides. Motor unit action potentials (MUAPs) were extracted from the EMG signals, and their root-mean-square value (RMSMUAP, reflecting MU size) and mean frequency of the power spectrum (FMEANMUAP, reflecting recruitment threshold) were calculated. FMEANMUAP was smaller on the affected than on the unaffected side, indicating an increased contribution of low-threshold motor units, possibly related to degeneration of high-threshold motor units. The ratio of RMSMUAP on the affected side divided by that on the unaffected side correlated significantly with the Fugl-Meyer score. This ratio may reflect the extent to which reinnervation has occurred on the affected side.
AB - The aim of this study was to investigate motor unit (MU) characteristics of the biceps brachii in post-stroke patients, using high-density surface electromyography (sEMG). Eighteen chronic hemiparetic stroke patients took part. The Fugl-Meyer score for the upper extremity was assessed. Subjects performed an isometric step contraction consisting of force levels from 5 to 50% MVC while sEMG of the biceps brachii was recorded with a two dimensional 16-channel electrode array. This was repeated for both sides. Motor unit action potentials (MUAPs) were extracted from the EMG signals, and their root-mean-square value (RMSMUAP, reflecting MU size) and mean frequency of the power spectrum (FMEANMUAP, reflecting recruitment threshold) were calculated. FMEANMUAP was smaller on the affected than on the unaffected side, indicating an increased contribution of low-threshold motor units, possibly related to degeneration of high-threshold motor units. The ratio of RMSMUAP on the affected side divided by that on the unaffected side correlated significantly with the Fugl-Meyer score. This ratio may reflect the extent to which reinnervation has occurred on the affected side.
KW - motor unit characteristics
KW - multi-channel array EMG
KW - EWI-15140
KW - IR-62755
KW - High-density surface EMG
KW - Stroke patients
KW - METIS-265194
KW - Motor unit action potentials
U2 - 10.1002/mus.21090
DO - 10.1002/mus.21090
M3 - Article
VL - 39
SP - 177
EP - 185
JO - Muscle & nerve
JF - Muscle & nerve
SN - 0148-639X
IS - 2
M1 - 10.1002/mus.21090
ER -