Table 1

Neurophysiological studies

Upper limbs (NCS)
A: Sensory nerve action potentials
NerveDigitRightLeft
Conduction velocity (m/s)Amplitude (μV)Conduction velocity (m/s)Amplitude (μV)
MedianIII5633.9
Upper limb surface EMG
MuscleAPBADMAPBADMFDI
SideRRLLL
CMAP (mV)7.8
Terminal motor latency (ms)3.5
Conduction velocity (m/s)Wrist-elbow58
Ulnar groove66
Elbow-axilla63
F-wave response (Ht 5 ft 6 in)F-M (ms) (minimum)24.9
Lower Limbs (NCS)
B: Sensory nerve action potentials
NerveRightLeft
CV (m/s)Amplitude (μV)CV (m/s)Amplitude (μV)
Sural4314
Lower limb surface EMG
MuscleEDBAHEDBAH
Side R R L L
CMAP88.7
TML (ms)4.84.1
Conduction velocity (m/s)Calf49
F wave response (Ht 5 ft 6 in)F-M (ms) minimum40.945.1
C: Concentric needle EMG
MuscleSpontaneous activityMotor units Maximum effort
NumberMax size (mV)
R.Biceps brachiiFasciculations 3+Long-duration polyphasic unitsReduced2
R.1ST Dorsal interosseousFIBS 2+, fasciculations 3+Long-duration polyphasic unitsDiscrete2
R.Rectus abdominisFasciculations 3+Long-duration polyphasic unitsDiscrete2
R.Vastus lateralisFasciculations 2+Long-duration polyphasic unitsReduced2
R.Tibialis anteriorPositive sharp waves 2+, FIBS 1+, fasciculations 1+Long-duration polyphasic unitsDiscrete3
L.Tibialis anteriorFasciculations 2+, positive sharp waves 3+, FIBS 3+Long-duration polyphasic unitsDiscrete3
R.Medial gastrocnemiusFIBS 3+,
Positive sharp waves 2+
Long-duration polyphasic unitsDiscrete3
  • CMAP, compound muscle action potential amplitude; EMG, electromyography; NCS, nerve conduction studies; TML, terminal motor latency.