“…Understanding exercise's mechanisms can lead to better adherence through tailored exercise prescriptions that induce hypoalgesia and regulate major body systems including immunological, hormonal, and autonomic functions (31,32). Exercise improves cardiac autonomic controlwhich can be evaluated through noninvasive methods like spectral analysis of heart rate variability -in athletes, healthy individuals, and patients with various chronic conditions (33)(34)(35). This is particularly relevant as autonomic nervous system impairment, influenced by factors like chronic stress and unhealthy lifestyle, plays a significant part in FM (1,15,16).…”