Effects of Hypopressive Techniques on the CORE Complex: A Systematic Review

The CORE complex refers to the muscles of the core region of the body, including the abdominal muscles, lower back muscles, and diaphragm. Among the various techniques aimed at improving CORE strength and functionality, abdominal hypopressive techniques have gained popularity. Objectives: To evaluate the available scientific literature on the effects of AHT on the CORE complex. Methods: A systematic search was conducted in January 2025 in PubMed, Web of Science, PEDro, Cochrane, ClinicalTrials.gov and Scopus. Only randomized controlled trials (RCTs) involving adults were included. Two reviewers independently selected studies and extracted data. The review was registered in PROSPERO (CRD-42023424933) and followed PRISMA guidelines. Results: Of 258 studies identified, 13 of them met the eligibility criteria for the final review. Showing the application of abdominal hypopressive techniques could have positive effects on the pelvic floor, transverse abdominis muscle, lumbar region, and diaphragm. The average methodological quality of the articles is 6.6 according to the PEDro scale. The risk of bias was high in 12 articles. Conclusions: Although the results show improvements in the CORE muscles after applying abdominal hypopressive techniques, further research is necessary to confirm these findings, given the insufficient methodological quality of the scientific literature and its high risk of bias.