Immediate effects of myofascial release to the pectoral fascia on posture and range of motion

Key points

1. 01Both myofascial release (MFR) and soft-touch control (CON) significantly reduced forward shoulder posture immediately after treatment
2. 02MFR produced a larger effect (5 mm reduction, effect size 0.420) than CON (2 mm reduction, effect size 0.191)
3. 03Horizontal abduction range of motion was unchanged by either intervention
4. 04Muscle excitation of upper, middle, lower trapezius and pectoralis major did not change with either treatment
5. 05Soft-touch alone producing postural improvement highlights the importance of control groups in manual therapy research

How it was conducted

Design

Randomized crossover clinical trial (single-blinded, within-subjects repeated measures)

Participants

59 right-handed adults with forward shoulder posture, mean age 27 years (SD 9), 30 female, otherwise asymptomatic

Intervention

4 minutes of therapist-administered myofascial release (cross-hand technique) to the right pectoral fascia, delivered by a Registered Massage Therapist with 18 years experience

Control

4 minutes of soft-touch (no pressure) to the same region by the same therapist

Primary outcomes

Forward shoulder posture (double-square method), horizontal abduction range of motion, and surface EMG of upper, middle, lower trapezius and pectoralis major during a reaching task

Washout

At least 48 hours between sessions; session order randomized and counterbalanced

What they found

• FSP interaction (treatment x time): F(1,58)=5.939, p=.018, effect size eta-p=.093
• MFR reduced FSP: PRE 128 mm (SD 19) to POST 123 mm (SD 19), F(1,58)=41.978, p<.001, eta-p=.420
• CON reduced FSP: PRE 126 mm (SD 19) to POST 124 mm (SD 18), F(1,58)=13.658, p<.001, eta-p=.191
• No significant difference between MFR POST and CON POST for FSP (p=.546)
• HA-ROM: no significant interaction, F(1,58)=3.294, p=.075, eta-p=.054
• Upper trapezius excitation: no significant interaction, F=1.080, p=.303, eta-p=.019
• Middle trapezius excitation: no significant interaction, F=.378, p=.541, eta-p=.007
• Lower trapezius excitation: no significant interaction, F=.035, p=.851, eta-p=.001
• Pectoralis major excitation: no significant interaction, F=.836, p=.364, eta-p=.015
• Moderate positive correlation between FSP and HA-ROM changes in the MFR condition: r=.308, p=.021

Limitations

• Results only generalize to healthy, younger, right-handed individuals; no follow-up measurements so duration of FSP reduction is unknown
• Horizontal abduction ROM reflects multiple anterior shoulder structures, not just the pectoral fascia, so changes in one tissue may not be detectable
• The unloaded reaching task may have been insufficient to reveal differences in muscle excitation; higher-intensity tasks might show effects
• Intervention pressure was applied subjectively by the therapist and was not quantified or standardized across participants

Why it matters

For patients

A single short session of hands-on treatment to the chest area can reduce forward rounding of the shoulders, but it is unclear how long the effect lasts or whether it reduces injury risk over time.

For clinicians

MFR produces a larger acute reduction in forward shoulder posture than soft-touch alone, but the clinical significance of a 5 mm change and its effect on shoulder pathology risk remain to be established; multiple sessions may be needed to affect range of motion or muscle activation patterns.

For readers

The finding that soft-touch alone also reduced forward shoulder posture underscores the need for rigorous controls in manual therapy trials and raises questions about the specific mechanisms behind any observed benefit.