
We all know that unpleasant feeling when we just know we’re coming down with something. Whether it’s a cold, flu, tonsillitis, or another viral infection, recognizing the first signs early is key to a quick and effective recovery. But what if we could detect that something is wrong with our body even before the first symptoms appear? Elonga can be a great tool to help with this.
How does it work?
Elonga measures Heart Rate Variability (HRV), which reflects the state of the Autonomic Nervous System (ANS). The condition of this system is then mirrored in the measurement results—showing regeneration, stress, and readiness levels. These results react to various stimuli from our environment, including stress, fatigue, or an impending illness.
That’s why, before an illness like a cold or flu fully develops, sudden and unusual changes in your measured values can occur. These changes might manifest as worse regeneration or higher stress, but surprisingly, they can also show improved results. If your regeneration and stress values fluctuate repeatedly without an obvious cause, this may signal that your body is fighting an infection—even if you don’t feel any physical symptoms yet.P

Real-Life Experiences from Our Users
Many of our users have reported cases where unexpected deterioration in results (such as a repeated drop in readiness below 30) predicted the onset of illness. If no usual explanation (like poor sleep, increased stress, or heavy physical exertion) is found, and the decline in values persists for several days, it’s very likely that an illness is behind it.
Users often noticed a longer-term drop in readiness several days before physical symptoms appeared. This insight allowed them to adjust their daily routine in advance, incorporate more rest, and prevent the illness from fully developing—or at least significantly shorten its duration and recovery time.
Should You Measure During Illness?
During the acute phase of illness—when symptoms are already clearly present—we recommend pausing Elonga measurements. At this stage, the body undergoes various defensive processes that can distort measurement results, leading to misinterpretations. (See Polyvagal Theory below.)

Why Might My Results Improve During Illness?
When your body is under attack by a virus or infection, false-positive measurement results can occur. This phenomenon is described by Polyvagal Theory (explained in detail in a research article on PubMed). This theory challenges traditional views of how the autonomic nervous system functions. It describes how the nervous system behaves unusually in extreme conditions, such as physical exhaustion or illness.These changes can significantly impact measurement results, sometimes showing unexpectedly high values (e.g., readiness above 80) that do not match your actual condition. That’s why such values shouldn’t be compared to your normal healthy-state measurements.
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How Can Elonga Help After Illness?
As you begin recovering and your symptoms subside, Elonga becomes a powerful tool again, helping you track your return to normal activity. Monitoring your measurements allows you to see how your body is responding to increasing activity and warns you if you need to slow down your return to full activity.
Regeneration and stress values will guide you in identifying which activities support your recovery and which you should still avoid. This applies not just to exercise, but also fatigue levels, mental stress, sleep quality, and other recovery factors.Optimizing these factors can lead to a faster and safer recovery without the risk of a relapse.

Final Recommendations
If your measurements show unusual results that aren’t linked to an obvious factor (like exercise, mental stress, or lifestyle changes), consider the possibility of an early-stage illness. If your measured values continue to worsen, adjust your daily routine, increase the frequency of your measurements, and monitor how the situation evolves. While Elonga is a practical tool for monitoring your health, it is not a substitute for professional medical evaluation. If you experience health issues, always consult a doctor.
Stay in control of your health and stay one step ahead of illness with Elonga!