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.