Effectiveness and Health Benefits of a Nutritional, Chronobiological and Physical Exercise Intervention in Fibromyalgia and Chronic Fatigue Syndrome (SYNCHRONIZE +)

Effectiveness and Health Benefits of a Nutritional, Chronobiological and Physical Exercise Primary Care Intervention in Fibromyalgia and Chronic Fatigue Syndrome: SYNCHRONIZE + Mixed Methods Study Protocol.

Chronic pain, fatigue and insomnia are classical symptoms of Fibromyalgia and Chronic Fatigue Syndrome, affecting seriously life quality. Non-pharmacological multicomponent approach is gaining relevance in Fibromyalgia treatment. However, nutrition and chronobiology are often not approached in-depth despite their potential. Furthermore, programs addressed to Chronic Fatigue Syndrome are still scare. This study aims to evaluate the effectiveness of a compact multidisciplinary group intervention based on nutrition, chronobiology and physical exercise in the improvement of lifestyle and life quality in Fibromyalgia and Chronic Fatigue syndrome.

The investigators will perform a mixed study through a randomized clinical trial in Catalonian Primary Care with patients diagnosed of Fibromyalgia (M79.7) or both Fibromyalgia and Chronic Fatigue Syndrome (G93.3). The control group will follow the usual clinical practice and the intervention group, the usual practice plus the studied intervention (12 hours in 4 days). The intervention (based on nutrition, chronobiology and physical exercise) will be designed taking into account participant's opinion through focus groups. In both groups, quality of life (EuroQol-5D), as well as MFI, VAS pain, PSQI, erMEDAS-17, BRIAN, REGICOR-Short, FIQR and HADs questionnaires will be collected, prior to the intervention, and 1, 3, 6 and 12 months post-intervention. Food intake, body composition, resistance and strength will also be evaluated. The effect size will be calculated using Cohen's d and logistic regression models will be used to quantify the impact of the intervention by adjusting for different variables. In addition, a qualitative analysis with a descriptive phenomenological perspective from post-intervention focus groups of participants and professionals will be done.

Inclusion Criteria:

• People aged 18-65, recent diagnosis of Fibromyalgia (M79.1) (<10 years), or diagnosis of Fibromyalgia and Chronic Fatigue Syndrome (M79 .7 and G93.3), with availability, motivation and interest in the intervention.

Exclusion Criteria:

• not meeting the inclusion criteria, being participating in other group interventions aimed at the treatment of these syndromes, presence of severe mental comorbidity or other relevant medical disorders or pathologies that may interfere with the evaluation of the intervention