Effects on neuromodulation, acupuncture, and aerobic exercises on migraine and tension-type headache outcomes: A systematic review and meta-analysis

Headaches are a very common reality affecting a large portion of the world's population. Studies indicate that nearly 50% of adults have suffered some type of headache in the past year, with migraine and tension-type headache being the most frequent types. Migraine, in particular, represents the leading cause of disability among young people aged 15 to 49 years, accounting for 5.6% of all years lived with disability. Tension-type headache affects about 38% of the general population.

These numbers show how these conditions generate significant social impact, especially in young and middle-aged adults.

Although medications are traditionally the first choice for headache treatment, some people need to seek non-pharmacologic alternatives. This is especially true for pregnant women and women who are breastfeeding, who have restrictions on medication use. In addition, there is the risk of developing headaches caused by overuse of medications, a problem affecting nearly half of people with chronic daily headaches. For these reasons, treatments such as neuromodulation (nerve stimulation), acupuncture, and aerobic exercise have been gaining attention as complementary or alternative therapeutic options.

This study aimed to scientifically evaluate the efficacy of these three non-pharmacologic approaches in the treatment of episodic migraine and tension-type headache. The researchers conducted a systematic review and meta-analysis, a rigorous scientific method for combining and analyzing results from multiple studies on the same topic. They searched six major scientific databases, including PubMed, the Cochrane Library, and Chinese databases, looking for studies published between January 2000 and June 2022. Only randomized controlled clinical trials were included, considered the gold standard for evaluating the efficacy of medical treatments.

The inclusion criteria required that studies involve adults with migraine or tension-type headache diagnosed according to standardized international criteria, and that they compare the treatments of interest with control groups receiving usual care, sham treatment, or no treatment.

From 872 articles initially identified, 27 studies were included in the final analysis, involving different countries such as the United States, Germany, China, Sweden, and Brazil. Of these studies, 19 investigated migraine treatments and 8 investigated tension-type headache treatments. The neuromodulation modalities included transcranial magnetic stimulation, occipital nerve stimulation, trigeminal nerve stimulation, and noninvasive vagus nerve stimulation. Acupuncture studies compared real acupuncture with sham (placebo) acupuncture.

Aerobic exercises were defined as activities that raise heart rate to 70% of maximum heart rate. The researchers analyzed five main outcome measures: number of headache days per month, pain intensity, episode duration, acute relief medication use, and quality of life.

The meta-analysis results revealed significant benefits for the three treatment modalities, although with different patterns depending on the type of headache. For migraine, neuromodulation proved especially effective, reducing the number of headache days per month by an average of 1.3 days, decreasing episode duration by 2.2 hours, and reducing the use of acute relief medication by 1.8 days per month. Acupuncture for migraine also demonstrated benefits, decreasing headache days by 0.7 days per month and reducing pain intensity by 0.9 points on a 0-10 scale. For tension-type headache, acupuncture was particularly effective in reducing relief medication use (a 3.3-day reduction per month), while aerobic exercise significantly reduced episode pain duration by 5.1 hours per month.

These findings have important practical implications for patients and health professionals. For migraine patients who suffer many days of pain per month, neuromodulation may be a particularly attractive option, especially considering its ability to also reduce medication use. Patients with very intense pain may benefit more from acupuncture, which showed significant effects in reducing pain intensity. For people with tension-type headache, both acupuncture and aerobic exercise offer important benefits, with the additional advantage that exercise provides benefits to multiple body systems.

These options are especially valuable for pregnant women, those who are breastfeeding, individuals with medication intolerance, or those who have developed headaches from medication overuse. In addition, these therapies can be used in combination with pharmacologic treatments, offering a more comprehensive and personalized approach.

However, it is important to recognize the limitations of this study. The overall quality of evidence was rated as low to moderate according to the international GRADE criteria, indicating that more high-quality research is needed for definitive confirmations. There were considerable variations among studies in terms of specific techniques used, treatment intensity, number of sessions, and follow-up periods, which made precise comparisons difficult. Many studies presented a moderate risk of methodologic bias, especially related to the difficulty of keeping participants and researchers "blinded" as to which treatment was being applied, something particularly challenging in interventions such as exercise.

In addition, sufficient data were not found on the long-term effects of these therapies, and the study did not include other non-pharmacologic modalities that may also be effective, such as manual therapy and relaxation techniques.

Despite these limitations, this study provides encouraging evidence that non-pharmacologic treatments can offer real benefits for people suffering from migraine and tension-type headache. The choice among different modalities should be individualized, considering the specific type of headache, predominant symptoms, patient preferences, medical contraindications, and practical factors such as cost and availability. It is fundamental that future research use standardized outcome measures and more rigorous methodologies to generate higher-quality evidence. In the meantime, these treatments represent safe and potentially effective options that can be considered as part of a comprehensive therapeutic plan, always under the guidance of qualified health professionals.

The important thing is that patients and physicians be aware of these alternatives in order to make informed decisions about the best path to headache relief.