You are partly right but not entirely right. There are many very similar patterns, which can lead to mistakes even with subjective perceptions, normally when you are going to get sick the hrv has a behaviour of increasing the rmssd and sdnn and lowering the heartrate, this is already a bad symptom, you will probably feel fine but that anomalous rise in the hrv is for a reason. Perceptions are called subjective for a reason, otherwise they would be called realistic perceptions. You can’t rely solely on one value and you have to analyse everything we have at our disposal to make decisions. By this I mean that going by subjective perceptions alone can also be a big mistake.
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