Effects of Low Versus High Frequency Percutaneous Electrical Nerve Stimulation on Chronic Neck Pain Patients.

Comparison and Effects of Low and High Frequency Percutaneous Electrical Nerve Stimulation on Myofascial Chronic Neck Pain Patients.

Comparison between high and low frequency percutaneous electrical nerve stimulation as treatment of myofascial chronic neck pain. The main hypothesis is that low frequency treatment will have more hypoalgesic effects than high frequency, and low frequency effects will last longer.

Inclusion Criteria:

• Neck pain of more than 6 months of evolution.
• Pain level of more than 30 millimeter on the VAS scale.
• Active myofascial frigger points on upper trapezius muscle.

Exclusion Criteria:

• Upper limb radiculopathy.
• Recent whiplash.
• Cervicogenic dizziness.
• Migraine.
• Previous cervical surgery.