O ciclo estral modula a hiperalgesia muscular inflamatória aguda e persistente em fêmeas sedentárias, mas não exercitadas
Estrous cycle modulates the acute and persistent inflammatory muscle hyperalgesia in sedentary but not in exercised female mice
Hayla Lourenço Rodrigues; Beatriz Botasso Gomes; Graciana de Azambuja; Maria Cláudia Gonçalves de Oliveira
Resumo
Palavras-chave
Abstract
BACKGROUND AND OBJECTIVES: Persistent pain is a significant public health issue, profoundly impacting quality of life. Women experience persistent pain more frequently and with greater intensity than men, which is attributed to sexual hormonal fluctuations. This study investigated the influence of the estrous cycle on the development and maintenance of acute and persistent inflammatory muscle hyperalgesia in sedentary and exercised female mice.
METHODS: The study analyzed mechanical muscle hyperalgesia in female Swiss mice that underwent a model of acute and persistent inflammatory muscle hyperalgesia, during each of the four estrous cycle phases (proestrus, estrus, metestrus or diestrus). Swimming exercises were performed before the induction of acute and persistent inflammatory muscle hyperalgesia.
RESULTS: The inflammatory stimulus of carrageenan during the proestrus phase induced the most intense acute muscle hyperalgesia. Conversely, in the estrus phase, the inflammatory stimulus induced the most intense persistent muscle hyperalgesia. The maintenance of persistent muscle hyperalgesia was not modulated by estrous cycle. Regular swimming exercise prevented the acute and persistent muscle hyperalgesia, regardless of the estrous cycle.
CONCLUSION: These findings suggest that the estrous cycle phase during which an inflammatory insult occurs is critical for the development of acute inflammatory muscle hyperalgesia and its transition to the persistent phase. This effect was observed in sedentary, but not in exercised female mice, suggesting that regular physical activity may provide analgesic benefits regardless estrous cycle phase or the associated fluctuations in gender hormones. Further research is necessary to elucidate the mechanisms underlying the development of inflammatory muscle pain in females.
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References
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Submitted date:
07/15/2025
Accepted date:
08/30/2025
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