Myotensive Extraocular Muscle Techniques Added to Manual Therapy for Migraine Without Aura

Migraine without aura is a complex neurological condition involving interactions between sensory, musculoskeletal, and central regulatory systems. Its recurrent pain episodes, associated symptoms, and functional impact make it a major cause of disability. Despite therapeutic advances, a substantial proportion of patients continue to experience insufficient symptom control or intolerance to medication, reinforcing the need for complementary, non-pharmacological treatment strategies. Physiotherapy, and specifically manual therapy, has gained increased relevance due to its safety, individualized application, and potential influence on neuromuscular and sensorimotor mechanisms involved in migraine. Alterations in the craniocervical region, including muscular hypertonicity, reduced mobility, and altered proprioception, are frequently observed in patients with migraine. These factors may contribute to pain modulation and central sensitization. Within this context, the oculomotor system has emerged as an area of interest due to its strong anatomical and functional connections with the upper cervical spine, brainstem integration centers, and vestibular and proprioceptive pathways. Extraocular muscles provide continuous proprioceptive input essential for coordinating gaze and head orientation. Dysfunction in this system may affect sensory integration, postural control, and cervico-ocular interactions, potentially contributing to increased sensory load and symptom exacerbation. Myotensive techniques applied to the extraocular muscles aim to regulate muscle tone, optimize ocular motility, and influence afferent sensory input to central integration centers. When combined with manual therapy directed at the craniocervical region and temporomandibular joint (TMJ), these techniques may contribute to improving neuromuscular coordination and reducing migraine-related symptoms. This trial seeks to evaluate the clinical effects of incorporating extraocular myotensive techniques into a structured manual therapy program in patients with migraine without aura. The study is a randomized, controlled, parallel-group clinical trial designed to compare two physiotherapy interventions. Ninety participants aged 18 to 65 years with a medical diagnosis of migraine without aura according to the International Classification of Headache Disorders, Third Edition (ICHD-III), will be randomly assigned through a computer-generated sequence to an experimental group or a control group. An independent researcher will manage allocation concealment using opaque, sealed envelopes. Evaluators will be blinded to group assignment, and data analysis will be conducted under blinded conditions. Both groups will receive six physiotherapy sessions over approximately eight weeks. The experimental group will receive combined craniocervical manual therapy and specific myotensive techniques applied to the extraocular muscles. The control group will receive the same craniocervical manual therapy program without oculomotor techniques. All interventions will be administered by physiotherapists trained in manual therapy. Oculomotor assessments will be supervised by professionals with expertise in optometry. Outcome measures will be assessed at baseline and post-intervention. Pain and disability will be evaluated through validated instruments, including the Visual Analogue Scale (VAS), Migraine Disability Assessment (MIDAS), Craniofacial Pain and Disability Inventory (CF-PDI), and the Migraine-Specific Quality of Life Questionnaire (MSQ). Cervical range of motion will be assessed using a gravity goniometer. Neuromuscular function of the deep cervical flexors will be evaluated through the Cranio-Cervical Flexion Test (CCFT) using pressure biofeedback in millimeters of mercury (mmHg), generating the Activation Score (AS) and Performance Index (PI). Oculomotor evaluation will include assessment of ocular motility, gaze-related pain perception, and functional changes in different gaze directions. Postural alignment of the head will be measured using goniometric procedures in a relaxed standing position. Heterophoria will be quantified using the Von Graefe test, expressed in prism diopters (Δ), with results categorized into esophoria (base-out, BO) or exophoria (base-in, BI) as applicable. All study procedures will take place at the Faculty of Nursing, Physiotherapy and Podiatry of the University of Seville. Data collection will be performed exclusively through secure digital platforms, ensuring compliance with the General Data Protection Regulation (GDPR) and relevant Spanish legislation on personal data protection. The intervention is non-pharmacological and low-risk, and all participants will provide written informed consent prior to enrollment. The purpose of this clinical trial is to determine whether incorporating specific techniques directed at the extraocular muscles enhances the effects of manual therapy in patients with migraine without aura. By examining changes in pain intensity, migraine frequency, disability, quality of life, cervical function, and oculomotor performance, this study aims to contribute new evidence to physiotherapy-based approaches and expand the range of safe and effective therapeutic options for individuals living with migraine.