Physical Therapy Korea
pISSN 1225-8962 eISSN 2287-982X
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Comparison of muscle activity of each muscle by exercises and forearm positions

Variable SIER STER PRER SLER F
Posterior deltoid Neutral 2.65 ± 1.35 15.69 ± 5.51a 52.38 ± 13.21a,b 17.12 ± 6.98a,c 152.400**
Supinated 2.35 ± 1.11 15.77 ± 6.62a 47.95 ± 10.81a,b 15.51 ± 6.90a,c 171.749**
Difference 0.30 ± 0.52 –0.08 ± 2.88 4.43 ± 7.61a,b 1.61 ± 2.47a 5.994**
t 3.164** –0.150 3.184** 3.580**
Infraspinatus Neutral 26.77 ± 9.01 45.01 ± 13.74a 80.39 ± 18.67a,b 54.66 ± 11.51a,b,c 180.628**
Supinated 23.09 ± 8.87 43.99 ± 13.42a 77.08 ± 16.54a,b 52.95 ± 11.13a,b,c 215.421**
Difference 3.68 ± 3.90 1.02 ± 4.70 3.31 ± 9.37 1.71 ± 5.67 1.633
t 5.168** 1.188 1.938 1.651
Biceps brachii Neutral 9.23 ± 4.50 13.49 ± 9.51a 9.73 ± 11.01b 3.30 ± 2.51a,b,c 43.155**
Supinated 8.03 ± 4.22 16.69 ± 9.85a 11.78 ± 14.10b 4.28 ± 3.08a,b,c 29.706**
Difference 1.20 ± 3.34 –3.20 ± 3.38a –2.05 ± 5.22a –0.98 ± 1.70a,b 9.574**
t 1.967 –5.185** –2.153* –3.162**

Values are presented as mean ± standard deviation. SIER, sitting external rotation at 0° abduction; STER, standing external rotation at 90° abduction; PRER, prone external rotation at 90° of abduction; SLER, side-lying external rotation at 0° abduction. aThere is a significant difference from SIER (p < 0.05), bThere is a significant difference from STER (p < 0.05), cThere is a significant difference from PRER (p < 0.05). *p < 0.05, **p < 0.01.

Phys. Ther. Korea 2022;29:106~116 https://doi.org/10.12674/ptk.2022.29.2.106
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