Muscle Onsets as % of total time Peak Magnitude as % of total time Peak Magnitude as % of MVC Electrode Type: sEMG Electrode Type: fEMG   Electrode Type: sEMG Electrode Type: fEMG   Electrode Type: sEMG Electrode Type: fEMG   Mean (SD) SE Mean (SD) SE r (p) Mean (SD) SE Mean (SD) SE r (p) Mean (SD) SE Mean (SD) SE r (p) TM 26.24 (14.86) 1.12 32.18 (6.11) 0.46 -0.01 (0.93) 49.15 (3.52) 0.27 35.63 (4.91) 0.37 0.09 (0.26) 30.43 (29.10) 2.21 25.92 (2.16) 0.16 -0.05 (0.53) Supra 7.05 (32.82) 2.49 7.30 (6.25) 0.47 0.07 (0.37) 57.20 (19.0) 1.44 42.91 (11.67) 0.88 0.05 (0.52) 36.56 (20.33) 1.54 62.38 (6.90) 0.52 -0.09 (0.28) Infra 14.73 (5.01) 0.38 8.36 (1.66) 0.13 0.07 (0.37) 23.85 (7.01) 0.53 29.26 (8.73) 0.66 -0.10 (0.19) 21.84 (6.76) 0.51 35.64 (8.83) 0.67 -0.74 (0.33) Post Deltoid 44.21 (13.27) 1.00 44.26 (13.8) 1.05 0.94* (<0.0) 68.13 (12.26) 0.93 63.17 (16.08) 1.22 0.90* (<0.00) 12.57 (4.10) 0.31 7.51 (0.67) 0.05 -0.03 (0.72) *Significant. sEMG: surface electromyography; fEMG intramuscular fine wire electromyography TM=teres major; Supra=supraspinatus; Infra=infraspinatus; SD=standard deviation; SE=standard error; r=correlation; MVC=maximal voluntary contraction.

Table 1: Means and correlation values for sEMG and fEMG signals during shoulder abduction.