EAS-EMG   US-EMG   simple phase interference phase mix phase simple-mix phase total simple phase interference phase mix phase simple-mix phase total MSA 7 4 19 4 34 7 2 18 4 31 PD 1 2 12 1 16 1 0 14 1 16 Likelihood ratioa 2.636 0.451 5.391 P value 0.145 aLikelihood ratio chi-square was used because theoretical frequency of six cells was less than 5.

Table 7: Comparison of recruited pattern when strong contraction between MSA and PD groups.