[Purpose] This study investigated the effect of shoulder girdle strengthening,
particularly the scapular muscles, on poststroke trunk alignment. [Subjects and Methods]
The study involved 30 patients with residual hemiparesis following cerebrovascular stroke.
Patient assessment included measuring shoulder muscle peak torque, scapular muscles peak
force, spinal lateral deviation angle, and motor functional performance. Patients were
randomly allocated either to the control group or the study group and received an
18-session strengthening program including active resisted exercises for shoulder
abductors and external rotators in addition to trunk control exercises. The study group
received additional strengthening exercises for the scapular muscles. [Results] The two
groups showed significant improvement in strength of all shoulder and scapular muscles,
with higher improvement in the study group. Similarly, the lateral spinal deviation angles
significantly improved in both groups, with significantly higher improvement in the study
group. Transfer activity, sitting balance, upper limb functions, and hand movements
significantly improved in the two groups, with higher improvement in the latter two
functions in the study group. [Conclusion] Strengthening of shoulder girdle muscles,
particularly scapular muscles, can significantly contribute to improving the postural
alignment of the trunk in patients with poststroke hemiparesis.