ASSOCIATION BETWEEN DEEP CERVICAL FLEXOR DYSFUNCTION AND REACTION TIME IN PATIENTS WITH CERVICOGENIC HEADACHE A CROSS- SECTIONAL STUDY
Description
Cervicogenic headache (CGH) is a secondary type of headache originating from dysfunction of the cervical spine and its associated musculoskeletal structures, commonly presenting as unilateral head pain accompanied by neck pain, stiffness, restricted cervical movement, and symptoms aggravated by sustained postures or neck movements. Among the contributing factors, dysfunction of the deep cervical flexor (DCF) muscles, particularly the longus colli and longus capitis, has been identified as a major component in the development and persistence of CGH. These muscles are responsible for maintaining cervical stability, postural alignment, and sensorimotor control of the neck. Weakness, poor endurance, or impaired activation of the DCF muscles may result in altered cervical biomechanics, overactivity of superficial neck muscles, reduced proprioceptive input, and increased stress on cervical joints and soft tissues, thereby contributing to pain and headache symptoms. Patients with CGH frequently demonstrate forward head posture, impaired neuromuscular coordination, reduced cervical muscle endurance, and deficits in proprioception. Since the cervical region contains a high density of proprioceptors that contribute to postural control and sensorimotor integration, dysfunction of the cervical musculature may adversely affect reaction time, which is the interval between the presentation of a stimulus and the initiation of a motor response. Reaction time reflects the efficiency of sensory processing, central nervous system integration, and motor execution, and delayed reaction time may indicate impaired neuromuscular control and altered proprioceptive feedback. Previous research has shown that individuals with neck pain and headache disorders often exhibit slower reaction times due to disturbances in cervical sensorimotor function. Impaired DCF performance may therefore influence reaction time by disrupting proprioceptive signaling and neuromuscular coordination. Despite the recognized importance of DCF dysfunction in cervicogenic headache, limited studies have specifically investigated its association with reaction time. Understanding this relationship is clinically important because delayed reaction time can affect functional performance, increase the risk of injury, and reduce the ability to respond efficiently during daily activities. Assessing both DCF dysfunction and reaction time may provide a broader understanding of the functional impairments associated with CGH and help physiotherapists develop more comprehensive rehabilitation approaches. Interventions focusing on DCF strengthening, motor control training, postural correction, and proprioceptive exercises may improve cervical stability as well as sensorimotor performance.
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Ethical clearance will be obtained from the institutional ethical committee prior to the commencement of the study. Participants diagnosed with cervicogenic headache who meet the inclusion and exclusion criteria will be recruited for the study, and written informed consent will be obtained after explaining the study procedure and objectives. Demographic data including age, gender, height, weight, and duration of symptoms will be recorded. Deep cervical flexor (DCF) muscle function will be assessed using the Craniocervical Flexion Test (CCFT). The participant will be positioned in crook lying position, and a pressure biofeedback unit will be placed beneath the cervical spine and inflated to a baseline pressure of 20 mmHg. Participants will be instructed to perform gentle craniocervical nodding movements while avoiding activation of superficial neck muscles. The pressure will be progressively increased in increments of 2 mmHg from 22 mmHg to 30 mmHg, with each stage maintained for 10 seconds. The highest pressure level successfully maintained without substitution or compensatory movements will be recorded as the DCF performance score. Reaction time will then be assessed using a computerized or validated mobile-based reaction time apparatus in a quiet and distraction-free environment. Participants will be seated comfortably and instructed to respond as quickly as possible to the presented visual or auditory stimulus by pressing a designated key or button. Multiple trials will be conducted, and the average reaction time will be recorded for analysis. Adequate rest intervals will be provided between trials to minimize fatigue. All collected data, including DCF scores and reaction time values, will be compiled and statistically analyzed using appropriate correlation tests such as Pearson or Spearman correlation to determine the association between deep cervical flexor dysfunction and reaction time in patients with cervicogenic headache.
Institutions
- Maharishi Markandeshwar University, MullanaHaryana, Ambāla