They also report that specific tension was reduced when pulse duration was decreased from 450 to 150 [micro]s, while frequency remained constant at 100 Hz, suggesting that pulse duration is influencing something other than recruitment of
motor units. Part of their explanation included the notion that longer pulse durations may preferentially activate fast-twitch
motor units, which produce higher torque than slow-twitch
motor units.
The 180[degrees]/s exercises, which are for endurance
motor unit potential, were the highest at week 2, and the average power steadily increased from week 4 to week 8.
[5.] Enoka RM, Bawa P, Wakeling JM, Gabriel DA, Kamen G, Meyer F, Stegeman D, van Wessel T, Zwarts MJ, Rainoldi A, Dimitrova NA, Dimitrov GV, Merletti R, Cresswell AG, Barry BK, Pincivero DM (2008) Comments on Point:Counterpoint: Spectral properties of the surface EMG can characterize/do not provide information about
motor unit recruitment strategies and muscle fiber type.
A greater force is the result of greater
motor unit activation.
(10.) Farina D, Li X, Madeleine P (2008)
Motor unit acceleration maps and interference mechanomyographic distribution.
Therefore, a closer examination of how acute indirect vibration may influence neural responses of
motor unit firing,
motor unit synchronisation, inter-muscular coordination is required.
In addition, MUNE methods provide a means of measuring
motor unit size, enabling tracking of both loss of
motor units and the compensatory phenomenon of collateral reinnervation, and have the advantage of measuring the severity of nerve injury in neuropathy with retained CMAP amplitude; MUNE is already used in neuromuscular disorders such as amyotrophic lateral sclerosis, spinal muscular atrophy, and neuropathies to monitor neuronal loss [18, 19].
In addition to the process of waveform simplification after the loss of
motor units, there is also a formation process of large and complex
motor units during reinnervation.
First, not all the
motor units are active during pathological tremor, and the muscle activation pattern, estimated from bipolar EMG recordings, depends significantly on the electrode position (Figure 1) and on
motor unit distribution within the muscle tissue [27].
Although concentric needle (CN) electrodes have been used to assess jitter in myasthenia gravis patients and healthy controls, there are few reports using CN electrodes to assess
motor unit instability and denervation in neurogenic diseases.
Using advanced signal processing techniques, the authors (12) reported significant intermuscular coherence between the VL and VM that was believed to potentially reflect shared
motor unit synchronization.
Additionally, there was a reduction in the recruitment and interference pattern of
motor units and chronic
motor unit remodeling changes to these muscles.
