Changes in pressure pain thresholds over C5-C6 zygapophyseal joint after a cervicothoracic junction manipulation in healthy subjects.

Fernández-de-Las-Peñas C, Alonso-Blanco C, Cleland JA, Rodríguez-Blanco C, Alburquerque-Sendín F

This study examines if C7-T1 manipulation results in changes in pressure pain thresholds (PPT) over bilateral C5-C6 zygapophyseal joints in asymptomatic subjects.  30 participants were randomly divided into 3 groups: experimental dominant group, subjects who received the manipulative thrust directed at the right side of the C7-T1 joint; experimental nondominant group, those who received the thrust on the left side of the C7-T1 joint; and a placebo group, those who received a sham-manual procedure.  Result analyses showed that both experimental groups showed greater improvements in PPT than the placebo group; the right side had greater increases in PPT in both experimental groups but not within the placebo group and  men experienced greater increases in PPT levels than women, particularly in the experimental nondominant group.

These results suggest that a C7-T1 manipulation induced changes in PPT in both right and left C5-C6 zygapophyseal joints in healthy subjects.

J Manipulative Physiol Ther. 2008, 31(5), 332-7

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