Postural balance is a fundamental component of human motor function and is essential for maintaining functional autonomy and performing activities of daily living. It relies on the continuous and dynamic integration of sensory inputs from the visual, vestibular, and somatosensory systems, which are processed by the central nervous system to generate appropriate motor responses. These responses allow the body to maintain the center of mass within the base of support through constant postural adjustments.
Within this complex sensorimotor system, the upper cervical region plays a critical role in postural control. This region is responsible for the precise orientation of the head in space and contributes significantly to the coordination between the head, eyes, and trunk. The suboccipital muscles-namely the rectus capitis posterior major and minor, and the obliquus capitis superior and inferior-are deeply located between the occiput, atlas, and axis, and are characterized by a high density of muscle spindles. This anatomical feature suggests a strong proprioceptive function, making these muscles key contributors to cervical position sense and sensorimotor regulation.
In addition to their proprioceptive role, the suboccipital muscles are anatomically and functionally connected to the dura mater through the myodural bridge. This structure is thought to play a role in both mechanical and sensory integration, linking muscular activity with the central nervous system. Furthermore, the upper cervical region contains joint mechanoreceptors that provide additional afferent input, contributing to reflex mechanisms such as the cervico-ocular, cervico-collic, and tonic neck reflexes, which are essential for maintaining postural stability and gaze control.
Alterations in muscle tone, increased stiffness, or dysfunction in the suboccipital region may disrupt the quality of afferent information transmitted to the central nervous system. Such disturbances can impair proprioceptive accuracy and interfere with postural control mechanisms, potentially leading to increased body sway, altered head positioning, and changes in center of pressure (CoP) behavior. Since CoP displacement reflects the neuromuscular strategies used to maintain balance, it serves as an objective measure for assessing postural stability.
The suboccipital inhibition technique is commonly used in osteopathic practice as a manual intervention aimed at reducing myofascial tension in the upper cervical region. By promoting muscle relaxation and potentially restoring normal proprioceptive input, this technique may contribute to the optimization of postural control mechanisms. Previous studies have demonstrated its effects on cervical mobility, pain reduction, and flexibility; however, evidence regarding its immediate impact on postural balance remains limited and inconclusive.
Given the theoretical and neurophysiological rationale supporting the role of the suboccipital region in postural regulation, further investigation is warranted. The present study aims to evaluate the immediate effects of the suboccipital inhibition technique on postural balance in healthy young adults, using objective measures derived from center of pressure analysis, specifically Mean CoP and Mean Velocity.
