Asymptomatic subjects should not present any pain in the cervical region during the last 3 months and no previous treatment for neck pain in order to be included in the study.

Patients with neck pain should have an intensity of pain of at least 3 points out of 10 on a Visual Analog Scale and a neck pain duration of at least 3 months of evolution. Neck pain could be from nonspecific mechanical origin, associated with whiplash or with a previous medical diagnosis of degenerative or inflammatory alterations of the cervical spine, associated or not with headache and pain in the shoulder region or the upper limb.

Inertial Measurement Unit (IMU) sensors will measure sensorimotor control variables including active range of motion, movement speed, acceleration, smoothness of motion, head repositioning accuracy and motion coupling patterns

Expressed as an angular displacement (°) in 3 full-movements (flexion-extension, lateral flexion and rotation)

Expressed as angular velocity (°/sec) in 3 full-movements (flexion-extension, lateral flexion and rotation)

expressed as movement jerk (º/sec3)

Calculated as the repositioning error considering the difference between the neutral starting position and the following positions reached after the performance of any of the movements

Calculated as the angular displacement occurring in a different anatomical plane to the one that is being tested for each of the planar movements

Measured using the short version of the International Physical Activity Questionnaire (IPAQ). The score of the scale is expressed in MET level x minutes of activity/day x days per week. Levels of 3.3 METs are considered light, 4.0 METs are moderate and 8.0 METs are vigorous.