HRV and PEM: What Wearables Can Show — and What They Cannot
HRV, resting heart rate, and activity can add context to exertion and recovery over time. In our current analyses, however, they are not reliable stand-alone early warnings for PEM.
Insights into the development of Elara Health. Technical decisions, scientific foundations, and lessons from the community.
The journal adds background on research decisions, product thinking, and lived experience. It works best when it helps readers move between articles, core guides, and deeper methodology.
Helpful related topics
These three areas usually give the clearest medical or practical context before you continue with individual posts.
Pacing
The pacing hub connects practical routines, mistakes, and tracking into one coherent decision model.
Open daily-life pacingME/CFS
Pacing becomes clearer when reduced capacity and PEM are framed within the broader ME/CFS pattern.
Open what is ME/CFSWhitepapers
The whitepapers explain how Energy Envelope Theory and related models shape Elara’s approach.
Open whitepapersCurrent highlights
Browse by research, development, or community perspective depending on what kind of background you want right now.
The Energy Envelope Theory describes the relationship between perceived available and expended energy. Here is what older studies suggest, where the limits are, and how Elara uses the concept today.
HRV, resting heart rate, and activity can add context to exertion and recovery over time. In our current analyses, however, they are not reliable stand-alone early warnings for PEM.
Open articleAn updated look at Elara’s app and website architecture, data minimization, consent-based analytics, and why current privacy notices take precedence over older infrastructure examples.
Open articleAfter six months in beta, we collected valuable feedback. The biggest takeaway: simplicity beats feature breadth - especially for people living with fatigue.
Open articleExplore every article in the developer journal
HRV, resting heart rate, and activity can add context to exertion and recovery over time. In our current analyses, however, they are not reliable stand-alone early warnings for PEM.
After six months in beta, we collected valuable feedback. The biggest takeaway: simplicity beats feature breadth - especially for people living with fatigue.
An updated look at Elara’s app and website architecture, data minimization, consent-based analytics, and why current privacy notices take precedence over older infrastructure examples.
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