Stress becomes clinically relevant when the system stops returning to baseline. You may feel wired but tired, mentally overextended, physically tense, more reactive than usual, and unable to recover properly even after rest. This page is for that broader pattern: chronic stress, work-related overload, burnout, PTSD-related hyperarousal, anxiety-linked overarousal, and persistent difficulty downshifting.
The strongest evidence here comes from approaches aimed at stabilizing the stress system. In a meta-analysis of 24 studies including 484 participants, HRV biofeedback produced a large, clearly meaningful reduction in stress and anxiety versus control (g = 0.83) (Goessl et al., 2017). For ISF neurofeedback specifically, in adults with anxiety, 10 ISF sessions produced significant shifts in autonomic markers including skin conductance, EMG, HRV, and systolic blood pressure, while the comparison group showed no significant changes (Balt et al., 2020). As a complementary tool, an 8-week transcranial photobiomodulation study in generalized anxiety disorder reduced Hamilton Anxiety scores from 17.3 to 8.5, with a large effect size (d = 1.47) and improved sleep (Maiello et al., 2019).
For PTSD and trauma-related hyperarousal, neurofeedback has shown particularly strong results. A meta-analysis of 7 randomized PTSD trials found mean remission rates of 79.3% in neurofeedback groups versus 24.4% in controls (Askovic et al., 2023). In a randomized trial of chronic PTSD, only 27.3% of patients still met PTSD criteria after neurofeedback, compared with 68.2% in the waitlist group (van der Kolk et al., 2016).
In practice, I use qEEG here to clarify whether the dominant pattern looks more like generalized overactivation, trauma-related dysregulation, poor downshifting, or stress that is being amplified by sleep disruption. When recovery appears to be blocked by broader biological factors, I widen the lens with a systems medicine approach so the training sits within a more coherent overall plan.
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