Sometimes you may perform two measurements shortly after each other and notice that the results differ. At first, this may seem confusing, but in reality, it is a completely natural and explainable phenomenon.
Why do the results differ when you measure twice in a row?
1. ANS activity changes rapidly
Elonga monitors the autonomic nervous system (ANS) using spectral HRV analysis. The ANS reacts instantly to psychological and physiological stimuli, often to things you are not consciously aware of.
Even a short time between two measurements can lead to noticeable differences.
2. The second measurement is influenced by psychology and expectations
When you measure again, you typically:
expect a certain outcome,
think about the first result,
focus more on how the second measurement will turn out.
These factors can alter ANS activity and therefore HRV values. Even a small psychological shift can produce a different result.
3. We do not recommend repeated back-to-back measurements
Results taken immediately one after another:
are not suitable for comparison,
reflect the change in mental state,
do not represent the stable morning baseline we aim to capture.
For this reason, we recommend measuring once per day, ideally in calm morning conditions.
4. ANS sensitivity varies between individuals
Some people have a very reactive ANS and their values fluctuate more. Others are more stable. This is individual, not a measurement error.
How to proceed correctly
1. Measure only once per day
Elonga is designed for a single morning measurement that reflects the body’s state after sleep.
2. Avoid thinking about the result during the measurement
Many users subconsciously focus on the expected outcome. This alone changes ANS activity and influences the result.
3. Follow standardized conditions
Measure:
in the morning
in calm conditions
lying down
without movement
without using your phone
before eating or drinking coffee
before physical activity
Standardization is the key to accuracy.
4. Follow long-term trends, not individual deviations
Differences between measurements are normal. What matters is the long-term trend, not a single isolated value.
Summary
Different results from two consecutive measurements are completely normal:
ANS changes very quickly,
psychology and expectations affect HRV,
repeated measurements are not suitable,
standardization is essential,
long-term trends are what truly matter.
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