Overview
When viewing the HRV graph, you may notice sections of the line displayed in blue instead of the usual black or red. This behavior is intentional and designed to improve graph readability and usability.
What Does the Blue Line Mean?
The presence of a blue line indicates that the heart rate or HRV value has gone outside the currently visible measurement range of the graph.
For example:
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If the graph is set to display 60–80 BPM
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And the heart rate goes above 80 BPM or below 60 BPM
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The line will appear blue
This visual cue lets you know the data has exceeded the visible range without disrupting the current view.
Why Is This Feature Used?
This measuring feature is designed to:
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Prevent the graph from jumping or rescaling abruptly
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Maintain a stable viewing window
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Allow you to better observe the overall parameter curve and trends
If the graph were to automatically expand every time values went out of range, it could make the display harder to follow and visually confusing.
How This Helps You
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Ensures a smoother, more consistent graph display
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Makes it easier to track patterns and coherence trends
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Provides a clear indication that values are above or below the current scale without altering the graph too severely
Summary
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Blue line = values exceed the current graph range
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Data is still being recorded accurately
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The display is intentionally constrained for better readability
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This improves the overall experience when viewing HRV data