Table 1. Comparison of EMG activity according to arm position (n=32)
% MVIC | Arm position | F | p |
PD | NT | PU |
Upper trapezius | 71.15±42.59 | 56.13±35.37 | 51.44±32.29 | 19.057 | <0.01* |
Lower trapezius | 63.01±24.45 | 59.16±22.47 | 52.13±18.83 | 6.175 | <0.01* |
Infraspinatus | 32.54±23.36 | 34.67±22.08 | 38.24±21.92 | 2.057 | 0.15 |
Serratus anterior | 31.53±17.63 | 33.46±17.02 | 44.59±21.69 | 9.177 | <0.01* |
Data are expressed as mean±standard deviation.
p<0.05. Abbreviation: MVIC, maximal voluntary isometric contraction; PD, palm down; NT, neutral; PU, palm up.