Therapeutic exercise is one of the most common physical medicine treatments and is recommended by many clinicians for a variety of musculoskeletal conditions. Many forms of therapeutic exercise have been evaluated and described in the scientifi c literature, including range of motion, isometric, postural, relaxation, strengthening, and aerobic. They are designed to stretch, relax, and improve posture and strength of the muscles, with the goal of improving tenderness, pain, function, and health [1][2][3][4][5][6][7]. However, the use of exercise to manage headaches is low, perhaps because of the lack of understanding of the effectiveness and mechanism of exercise for headache disorders such as tension-type headache (TTH). Yet, a number of studies have examined exercise to improve both TTH and temporomandibular disorder (TMD) muscle pain, which can provide us some answers. This commentary presents the results of a systematic review of randomized controlled trials (RCTs) that help shed light on whether exercise will improve headache and TMD muscle pain.
Methods for Systematic ReviewAny RCT that evaluated the effectiveness of therapeutic exercise for headache was eligible for inclusion in this review. Studies that included both adults and children who had pain related to TTH and TMD muscle pain and were treated with therapeutic exercises were eligible for inclusion. TTH is the most common type of primary headache, with a lifetime prevalence in the general population ranging from 30% to 78%. At the same time, it is the least studied of the primary headache disorders, despite the fact that it has the highest socioeconomic impact. For these searches, the inclusion criteria involved several terms to identify the published TTH and TMD pain literature relevant to the systematic review, which are listed in Fricton et al. [8]. In addition to the TTH diagnoses, TMD muscle pain was also included as a target population because TMDs often result in headache, and the diagnosis of masticatory muscle pain involving the temporalis (as defi ned by the American Academy of Orofacial Pain classifi cation) has signs and symptoms that overlap with TTHs (as defi ned by the International Headache Society) [8,9].This review was limited to published RCTs for the assessment of the effectiveness of interventions and used the QUOROM (Quality of Reporting of Meta-analyses) guidelines [10]. However, it is acknowledged that nonrandomized controlled trials and observational cohort studies provide important information and may be the design of choice to test some types of interventions. They were not included in this search strategy because of their potential for introducing selection bias and dissimilar comparison groups.
Outcomes assessedPain severity, as an outcome, was selected as the measure to determine the relative benefi t of the study interventions because pain is the major symptom of headache, is the reason most patients seek treatment, and usually refl ects the severity of headache [9,11]. Methods for pain measurement were not strictly sta...