Efeitos do agulhamento seco em um modelo de dor muscular induzida em ratos

Abstract

Myofascial pain syndrome (DSM) is a musculoskeletal disorder that can be present in up to 85% of people at some stage of life, causing high direct and indirect health costs. There is evidence to indicate an increase in oxidative stress at the sites where the trigger points (PG) are found, with the presence of PG palpable in the muscle band the main clinical sign presented. Physiotherapy has been applying a number of techniques with the aim of reducing pain symptoms, improving the strength and functionality of patients with MPS, and dry needling is one of the approaches that are on the rise. In this way, the objective of this study was to verify the effects of dry needling in a muscle pain model in rats under thermal and mechanical hyperalgesia, locomotor and functional activity and oxidative stress. In total, 48 Wistar rats (male, 250-300g, 8 weeks old) were divided into six groups: saline control - which received saline injection at pH 7.0; acid saline - which received saline injection at pH 4.0; positive control Pregabalin - which received saline injection at pH 4.0 and treatment with Pregabalin i.p. (20 mg / kg); deep needling - which received saline injection at pH 4.0 and treatment with deep dry needling; superficial needling - that received saline injection with pH 4.0 and treatment with superficial dry needling; and twitching needles - which received the injection of saline with pH 4.0 and dry needling twitch. Thermal, mechanical and edema hyperalgesia, locomotion, strength and functional characteristics and oxidative stress were evaluated. We verified that the groups that received treatment had significantly better strength and functionality than the group that received acidic saline (p <0.01); The group receiving pregabalin treatment had a significant reduction in the locomotor and exploratory activities (p <0.05), and the group receiving treatment with twitch needle showed a significant increase in the antioxidant response (p <0.01). This study demonstrated that dry needling improves strength, functionality and locomotor activity in the proposed pain model; still, we verified that the twitch modality presents local antioxidant effect.