Effects of deep cervical flexor training on impaired physiological functions associated with chronic neck pain: a systematic review

Background:Neck pain is a major health issue with high rates of recurrence. It presents with a variety ofaltered sensorimotor functions. Exercise is a cornerstone of rehabilitation and many training methods areused. Exercise is evaluated in most randomized controlled trials on its pain relieving effects. No review hasassessed the effect of exercise on the altered physiological functions or determined if there are differentialeffects of particular training methods. This review investigated the effects of deep cervical flexor (DCF)training, a training method commonly used for patients with neck pain, and compared it to other trainingmethodsornotrainingonoutcomesofcervicalneuromuscular function, muscle size, kinematics and kinetics.Methods:Web of Science, Scopus, CINAHL, PubMed were searched from inception until January 2018. Twelverandomized controlled trials were included that compared DCF training as sole intervention to other trainingor no interventions in persons with neck pain. The Cochrane Risk of Bias tool was used to assess the methodquality. All outcome measures were analysed descriptively and meta-analyses were performed for measuresevaluated in three or more studies.Results:DCF training was compared to cervical endurance, strength, proprioception and mobility training,muscle stretching, and no intervention control groups. Physiological outcome measures includedneuromuscular co-ordination (craniocervical flexion test), functional tasks, muscle fatigability, muscle size,kinematics (joint position sense, posture and range of motion) and kinetics (strength, endurance andcontraction accuracy). Strong evidence was found for effectiveness of DCF training on neuromuscularcoordination, but it had no or small effects on strength and endurance at higher loads. DCF trainingimproved head and cervical posture, while evidence was limited or contradictory for other measures.Conclusions:DCF training can successfully address impaired neuromuscular coordination, but not cervicalflexor strength and endurance at higher contraction intensities. A multimodal training regime is proposedwhen the aim is to specifically address various impaired physiological functions associated with neck painValiderad;2018;Nivå 2;2018-11-30 (inah)