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Common modulation of motor unit pairs during slow wrist movement in man.

Artikel i vetenskaplig tidskrift
Författare Naoyuki Kakuda
Masanori Nagaoka
Johan Wessberg
Publicerad i The Journal of physiology
Volym 520 Pt 3
Sidor 929-40
ISSN 0022-3751
Publiceringsår 1999
Publicerad vid Institutionen för fysiologi och farmakologi, Avdelningen för fysiologi
Sidor 929-40
Språk en
Länkar www.ncbi.nlm.nih.gov/entrez/query.f...
Ämnesord Acceleration, Adult, Electromyography, Female, Humans, Male, Middle Aged, Motor Neurons, physiology, Movement, physiology, Muscle, Skeletal, innervation, physiology, Posture, physiology, Time Factors, Wrist, physiology
Ämneskategorier Neurofysiologi

Sammanfattning

1. The activity of 36 pairs of single motor units were recorded with intramuscular wire electrodes from m. extensor carpi radialis while subjects performed slow wrist extension and flexion movements. Periods of steady position holding were interposed between movements. 2. The discharge trains from pairs of motor units were analysed statistically in the time and frequency domains. During extension movements, when the muscle recorded from was the agonist, coherence between motor units was significant below 12 Hz, with a peak at 6-12 Hz in 30 of 36 pairs (83 %). The magnitude of coherence decreased during position holding compared to movements in 26 pairs, while the difference in average firing rate was small. 3. During movements, but not during position holding, coherence estimates between single motor units and acceleration showed a significant peak at 6-12 Hz in 56 out of 62 motor units, suggesting that a modulation of motor unit discharge contributed to angular acceleration at these frequencies. Common motor unit modulation was present at 3 Hz as well, although the coupling between motor unit activity was weaker than at 6-12 Hz. 4. It is concluded that a 6-12 Hz common modulation of agonist motor units is a distinguishing feature of slow voluntary wrist movements, extending the previously established notion of an 8-10 Hz rhythmic organization of slow finger movements to more proximal limb segments. It is suggested that the 6-12 Hz input is specific for movements and is normally absent or much weaker during steady maintenance of position or force.

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