A relationship between pectoralis minor muscle tightness and rounded shoulder posture (RSP) has been suggested, but evidence demonstrating that treatment aimed at the pectoralis minor affects posture or muscle function such as lower trapezius strength (LTS) remains lacking. In this randomized, blinded, controlled study of the 56 shoulders of 28 healthy participants, the experimental treatment consisting of pectoralis minor soft tissue mobilization (STM) and self-stretching significantly reduced RSP compared to the pre-treatment baseline (Friedman test, p05). This study demonstrated that STM and self-stretching of the pectoralis minor can significantly reduce RSP. © 2009 Elsevier Ltd.
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