This will be a prospective randomized controlled trial with sixty adults, 20 to 40 years of age. There will be three groups as follows: twenty subjects with no pain in the normal group; forty subjects with chronic subclinical neck or upper quadrant pain will be randomized into two groups: twenty subjects in the control group, and twenty subjects in the intervention group. The aim is for an equal distribution of males and females in each group.~Data will be collected for each subject using the NORAXON® myoMOTION™ System, the visual analog scale (VAS), the State-Trait Anxiety Inventory (STAI), and the Neck Disability Index (NDI); all assessments will be made by a clinician.~Normal group (20 subjects): Initial assessment on day one and post assessments on day eight and on day thirty. Control group (20 subjects): Initial assessment on day one and post assessments on day eight and on day thirty. Intervention group (20 subjects): Initial assessment on day one pre-intervention and post-intervention assessment of high-frequency sensory TENS (gate control theory of pain) for thirty minutes followed by post-assessments in day eight and day thirty.~The intervention group will receive a thirty-minute high frequency TENS (gate control theory of pain) once a day for seven days and twenty-one days after the initial seven days to measure immediate and short-term effects on the dependent variables further described below. Subjects will be educated on TENS usage by a licensed physical therapist. A daily log will be given to all subjects in the intervention group to assure compliance with treatment. In addition, the TENS device will keep track of date, time and day of usage, and TENS parameters.
This will be a prospective randomized controlled trial with sixty adults, 20 to 40 years of age. There will be three groups as follows: the normal group, control group, and intervention group where subjects will receive instructions for home use of TENS for pain reduction. The aim is for an equal distribution of males and females in each group.