OBJECTIVE: To investigate the effects of a C1-2 high-velocity, low-amplitude manipulation on ELPCT.
DESIGN: A single-group, randomized pilot study without a control group.
METHODS: Thirteen men (mean age 24.2 years) without a history of eye disease or central or autonomic nervous system pathologic conditions had their ELPCT measured before and after manipulation. The manipulation comprised a high-velocity, low-amplitude rotatory thrust, localized to the C1-2 joint on the left (n = 6) or right (n = 7) eye, determined randomly.
RESULTS: ELPCT measures demonstrated a significant difference for both eyes before and after manipulation (P = .002; the right eye, P = .027; the left eye, P = .046).
CONCLUSION: This suggests that ELPCT, which is mediated through the autonomic nervous system, can be directly influenced by high-velocity manipulation to the upper cervical spine.
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