If indicated, other accessory muscles may be investigated, either simultaneously or immediately after the sEMG of the muscles described above Figure 2 At least 5 repetitions of motion through the R.O.M. are needed in order to establish the repeatability and statistical validity of the compliance of the person tested for the requirements of the testing. Testing of the baseline activity, at rest, needs to be performed initially, i.e. before the R.O.M. protocol, between periods of muscular activity through the R.O. M. and at the end of testing. Testing can be done in three different modalities with regards to gravity and resistance. The first modality is that of the muscle motion through the R.O.M. without any resistance or conscious effort. The second modality is that of the muscle motion through the R.O.M. while the person exerts maximal voluntary contraction.
Statistical analysis needs to be done.
The computer software should be able to produce statistical data which enables the investigator or clinician to interpret the sEMG results. The following graph illustrates the fact that normal resting values may co-exist with abnormal ones, such as with muscle spasm. The graph below illustrates this point on the right and left SCM during neck flexion. The maximal amplitudes during activity are above 4mV and are very close to one another for the contra-lateral muscles. The maximal amplitudes during rest are above 4mV on the right side.