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

Variable SIER STER PRER SLER F
IF/PD ratio Neutral 11.33 ± 4.06 3.05 ± 1.03a 1.59 ± 0.40a,b 3.75 ± 1.95a,c 79.067**
Supinated 10.64 ± 3.61 3.06 ± 1.13a 1.66 ± 0.39a,b 4.08 ± 2.16a,c 65.323**
Difference 0.69 ± 1.61 –0.02 ± 0.49 –0.07 ± 0.16 –0.33 ± 0.83 2.531
t 2.356* –0.191 –2.212* –2.210*

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; IF, infraspinatus; PD, posterior deltoid. 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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