[en] Background. Low back pain is one of the pathologies with the highest prevalence worldwide. It is estimated that around 80% of the total population will suffer low back pain at least once throughout their lives, this is why the health services have to invest a large amount of resources in the care and treatment of this pathology. In studies carried out in people with low back pain, it has been observed that there are alterations in the function and morphology of the anterolateral muscles of the abdomen, such as changes in the activation patterns of the deep musculature and its hypotrophy. However, there is controversy over whether alterations in the anterolateral muscles of the abdomen are the cause of low back pain or a sign that manifests when suffering from this disease. However, there are few references describing these changes in individuals with low back pain compared to healthy people. Objetive. The objective of this study is to observe, by ultrasound, if there are differences in the morphology of the anterolateral musculature of the abdomen between two groups of young adults: a healthy group and another with low back pain. Methods. We propose the development of two studies called descriptive cross-sectional studies of prevalence, which would later be compared. Two groups would be formed, one group with healthy subjects and the other with subjects with low back pain. A morphological and bilateral analysis is carried out in each subject, by means of ultrasound, through the measurement of the thickness of the rectus abdominis, the external oblique, internal oblique and the transversus abdominis.; and the evaluation of the anatomical positioning of this musculature would also be evaluated. In addition, the distance between the rectus abdominis will be objectified at three points: at the height of the xiphoid process,at the level of the navel and immediately below the navel.

[gl] Introdución. A dor lumbar é unha das patoloxías con maior prevalencia a nivel mundial. Estímase que ao redor do 80% da poboación total sofrerá ao longo da súa vida al menos unha vez esta doenza, polo que os gobernos teñen que investir gran cantidade de recursos nos servicios sanitarios para a atención e tratamento desta patoloxía. En estudos desarroiados en suxeitos con dor lumbar observouse que existen alteracións na función e na morfoloxía da musculatura anterolateral do abdomen, como cambios nos patróns da musculatura profunda e a hipotrofia desta. Sen embargo, existe controversia en si as alteracións da musculatura anterolateral do abdomen son a causa da dor lumbar ou un signo que se manifesta ao padecer esta enfermidade. Sen embargo, son escasas as referencias que describen estes cambios en individuos con dor lumbar respecto ás persoas sans. Obxectivo. O obxectivo deste estudio é observar, mediante ecografía, se existen diferenzas na morfoloxía da musculatura anterolateral do abdomen entre dous grupos de adultos xóvenes: un grupo san e outro con dor lumbar. Material e método. Se plantexa a elaboración de dous estudos denominados como estudos descritivos transversais de prevalenza, os cales posteriormente serían comparados. Se conformarían dous grupos, un grupo con suxeitos sans e outro con suxeitos con dor lumbar. Realízase unha análise morfolóxica e bilateral en cada suxeito, mediante ecografía, a través da medición do grosor do recto abdominal, o oblicuo externo, o oblicuo interno e o transverso do abdomen; e a avaliación do posicionamento anatómico desta musculatura. Ademais, observarase a distancia entre o rectos abdominais en tres puntos: ao nivel do proceso xifoideo, ao nivel do ombligo e inmediatamente por debaixo do ombligo.