Fig. 1From: Effects of arm and leg positions on lumbar multifidus muscle activity while on hands and knees or while standingMeasurement postures. a Shoulder flexion/hip extension in the hands and knees position (SFHE-HK). b 90° shoulder abduction/hip abduction in the hands and knees position (SAHA-HK). c Shoulder flexion/hip extension in the standing position (SFHE-S). d 90° shoulder abduction/hip abduction in the standing position (SAHA-S)Back to article page