Key result
A theoretical model demonstrates that high-frequency indexes of heart rate variability do not necessarily reflect proportional changes in cardiac vagal tone.
This theoretical model challenges the paradigm that high-frequency indexes of HRV directly and proportionally reflect cardiac vagal tone.
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HF HRV indexes may not reliably track vagal tone changes; challenges their use as direct surrogates and leaves interpretation open for validation.
Pyetan et al. (2003) studied Heart rate variability and cardiac vagal tone. Theoretical model of vagal blockade was evaluated on Relationship between mean HR, RSA, and cardiac vagal tone. A theoretical model demonstrates that high-frequency indexes of heart rate variability do not necessarily reflect proportional changes in cardiac vagal tone.
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