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  1. Nightsong

    Preprint Digital health app data reveals an effect of ovarian hormones on long COVID and myalgic encephalomyelitis symptoms, 2025, Male+

    Background: Long COVID and myalgic encephalomyelitis/chronic fatigue syndrome (ME/CFS) disproportionately affect females, suggesting modulation by sex hormones. We sought to investigate whether symptom severity is influenced by changes in sex hormones over the menstrual cycle, or by hormonal...
    • Nightsong
    • Thread
    • contraception long covid me/cfs menstruation sex hormones visible app
    • Replies: 32
    • Forum: ME/CFS research
  2. Nightsong

    Digital physiological biomarkers predict within-person symptom changes in complex chronic illness, 2026, Aitken et al

    Now published, see post #21. Smartphone-based monitoring of heart rate variability and resting heart rate predicts variability in symptom exacerbations in people with complex chronic illness Abstract: Background: Complex chronic conditions like Long COVID and Myalgic...
    • Nightsong
    • Thread
    • brain fog heart rate heart rate monitoring heart rate variability iwasaki long covid me/cfs polybio putrino resting heart rate smartphone visible app
    • Replies: 53
    • Forum: Long Covid research
  3. hibiscuswahine

    WatchME and other HR/HRV monitoring apps

    I have been using a combination of apps for Pacing that utilise heart rate (HR) and heart rate variability (HRV) using Apple iWatch and iPhone. I have been using the watchME app and found it very useful, especially to monitor for conditions likely to induce PEM. Based on resting HR on waking...
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