Background and Objectives: Exercise-induced hypoalgesia (EIH) is a topic of interest in the scientific community. This umbrella review aimed to analyze EIH research and compare it with public dissemination on X. Materials and Methods: We selected relevant EIH reviews that included a healthy population or patients with pain and studied exercise interventions. A systematic literature search was carried out in PubMed, Web of Science, SciELO, PEDro, and Google Scholar, employing the Population, Intervention, Comparison, and Outcome strategy. Data were extracted and summarized, and methodological quality was assessed with the Quality Assessment Scale for Systematic Reviews, and risk of bias with the Risk of Bias in Systematic Reviews tool. The Physical Activity Guidelines Advisor Committee was employed for evidence synthesis. Simultaneously, advanced X website searches gathered EIH-related content for analysis. Information from posts on X was qualitatively analyzed and contrasted with evidence in the literature. Results: We included nine systematic reviews and 17 narrative reviews. Systematic reviews presented high methodological quality. However, half had low risk of bias, while the other half presented high risk of bias. The EIH in healthy participants was controversial for some exercise modalities, such as aerobic exercise, and the influence of psychological variables. Modalities, such as isotonic resistance exercise, showed favorable effects on hypoalgesia. However, in patients with musculoskeletal pain, different exercise modalities did not generate EIH. X analysis unveiled a considerable representation of science-related content, although with prevalent misinterpretations of scientific evidence. Conclusions: EIH has been extensively studied, yet the certainty of evidence remains limited. While some exercise modalities demonstrate hypoalgesic effects in asymptomatic individuals, these effects remain unverified in patients with musculoskeletal pain. Moreover, the analysis of social media content highlights frequent misinterpretations of scientific evidence, particularly conflating hypoalgesia with analgesia. This underscores the need for more precise, evidence-based communication on social media platforms.

Ehlers-Danlos syndromes (EDS) are a heterogeneous group of connective tissue disorders characterized by joint hypermobility, skin hyperextensibility, and tissue fragility. In addition to experiencing chronic pain, musculoskeletal injuries, and recurrent dislocations, their condition often involves symptoms related to dysautonomia, which can dominate the pathology and lead to significant disability. A 26-year-old woman diagnosed with hypermobile EDS with chronic pain and dysautonomia symptoms of 3 years' duration was evaluated. Pain pressure thresholds, heart rate, peripheral skin temperature, and skin conductance were assessed during a Tilt Test and modified Bruce protocols for this study. Two measurements were taken, one before and one after 7 weeks of treatment. The treatment, based on interval-type cardiovascular exercise and general strength training, produced significant changes in all the variables mentioned above. Decreases in heart rate, temperature, and skin conductance were observed, as well as an increase in pain pressure thresholds in certain cases. The results of this case may indicate that an exercise-based intervention is capable of producing changes in variables related to the autonomic nervous system and descending pain modulation systems in a patient diagnosed with hypermobile EDS.

Antecedentes: La apnea es una condición caracterizada por la interrupción de la respiración, y se cree que afecta el reflejo barorreceptor en distintos volúmenes pulmonares, influyendo en las respuestas de sensibilidad al dolor. Objetivos: El presente estudio tuvo como objetivo analizar el efecto de episodios de apnea, realizados con volúmenes pulmonares altos y bajos, sobre la hipoalgesia. Métodos: Los participantes fueron asignados aleatoriamente a dos grupos: un grupo de apnea a volumen pulmonar alto (GA) y otro a volumen pulmonar bajo (GB). Ambas intervenciones consistieron en series intermitentes de apnea durante un periodo de 6 minutos, mientras caminaban en una cinta. La hipoalgesia se evaluó mediante umbrales de dolor a la presión (UDPs) e intensidad de dolor evocado (DE) en el pulgar, el tibial anterior y la vértebra C7. También se registraron los valores de saturación de oxígeno, frecuencia cardíaca y percepción subjetiva del esfuerzo (PSE) durante las intervenciones. Resultados: Se incluyeron veintiocho sujetos sanos, asignados en un ratio 1:1 a los grupos GA y GB. Ambos grupos mostraron un aumento en los PPTs en el tibial anterior (F=10,902, p=0.003, η²=0.295) y en C7 (F=7.62, p=0.01, η²=0.227). La intensidad del DE disminuyó en ambos grupos únicamente en el tibial anterior (F=45,455, p=0.043, η²=0.149). No se observaron interacciones significativas entre el tiempo y el grupo en ninguna de las localizaciones corporales, ni para los UDPs ni para la intensidad del DE, lo que indica que la sensibilidad al dolor se modificó de forma similar en ambos grupos. Conclusiones: Ambas maniobras de apnea, tanto con volumen pulmonar alto como bajo, parecen modificar la sensibilidad al dolor. Sin embargo, los cambios observados fueron similares entre las intervenciones, sin diferencias marcadas entre ellas.