Manual therapy
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Randomized Controlled Trial
A preliminary investigation into the relationship between cervical snags and sympathetic nervous system activity in the upper limbs of an asymptomatic population.
Spinal manipulative therapy techniques are commonly employed by physiotherapists in the clinical setting for the management of neuromusculoskeletal pain and dysfunction, although their underlying mechanism is not fully understood. Mulligan's sustained natural apophyseal glides (SNAGs) constitute one of these techniques. This preliminary investigation was undertaken to investigate the relationship between the application of cervical SNAGs to the C5/6 intervertebral joint (with cervical right rotation) and indirect measures of sympathetic nervous system (SNS) activity. ⋯ There were no apparent left/right upper limb differences for SC and ST for each condition. The results of this study suggest that cervical SNAG techniques, performed on naïve asymptomatic subjects, have a sympathoexcitatory effect as measured by changes in SC and ST. The importance of this sympathoexcitatory effect in relation to potential mechanisms for manipulation induced analgesia are discussed, and further areas of research proposed.