After the provocation, the nasal airflow resistance of allergic subjects showed a positive trend, whereas LF/HF (Low Frequency/High Frequency) ratio and LF power showed a negative trend.
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Dynamic Changes in Heart Rate Variability and Nasal Airflow Resistance during Nasal Allergen Provocation Test.
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The sentences
The main finding was that when the nasal airflow resistance of birch pollen allergic subjects increases after the provocation, the LF energy and LF/HF ratio decrease with a clear trend.