1. Chronic neck pain is common in general population.

   • High health care source expenditure
   • Multiple therapeutic approaches available with limited evidence
   • Previous studies showed active strengthening exercise improved pain (VAS) and functional performance (NDI)
   • Muscle strengthening exercise with biofeedback technique showed more long-lasting effect in patients with chronic neck pain

2. The investigators hypothesize that daily use of the neck strength exerciser (NSE), combined biofeedback technique with muscle strengthening exercise posture adjustment, in addition to traditional physiotherapy, could have more long-lasting and prominent effect on pain and functional improvement in patients with chronic neck pain.

1. A randomized single-blinded trial to compare the effect of combined home-based NSE with physiotherapy could be more effective to treat people with chronic neck pain

• The NSE is a simple equipment that is easy to learn and safe to apply as home-based program
• The NSE will apply to the patients in the NSE group for 6 weeks, and we will compare the target variables to see if it brings better improvement by correction of maladaptive habitual posture and daily postural muscle exercise

Inclusion Criteria:

• Adult, ≧20 yr.
• Constantly or frequently occurring neck pain for more than 3 months in the last 1 year.
• Motivated and willing to participate in rehabilitation therapy
• Sign written informed consent.

Exclusion Criteria:

• Neck or shoulder surgery.
• Clinical evidence of cervical radiculopathy or myelopathy.
• History of disk disease, degenerative joint disease, fracture, or dislocation in the cervical vertebrae.
• Severe pathological change in the cervical vertebrae, including inflammatory rheumatic disease and tumor.
• History of poor diet, hypothyroidism, or other severe systemic disorders.
• Cognitive deficit and severe psychiatric illness.