HRV Studies

An Overview of Heart Rate Variability Metrics and Norms

Date: 2017.09

This study explores how autonomic neurons and hormones influence the heart's rhythm, with heart rate variability reflecting the complex interplay of regulatory systems over different time scales.

Dietary Sodium Effects on Heart Rate Variability in Salt-Sensitivity of Blood Pressure

Date: 2008.05

This study found that high salt intake increased parasympathetic activity, as indicated by HRV, particularly in salt-sensitive individuals, suggesting sodium balance influences autonomic control of the heart.

Heart rate variability as a function of menopausal status, menstrual cycle phase, and estradiol level

Date: 2022.05

This study examines the relationship between HRV and estradiol levels in women of varying menopausal status, highlighting how hormonal state may influence cardiovascular risk and stress response.

Low levels of dehydroepiandrosterone sulfate are associated with the risk of developing cardiac autonomic dysfunction in elderly subjects

Date: 2019.02

This study found that lower DHEA-S levels were associated with reduced HRV and diminished parasympathetic modulation of the heart, suggesting a link between hormone decline and autonomic dysfunction with age.

Evaluating the Clinical Utility of Daily Heart Rate Variability Assessment for Classifying Meaningful Change in Testosterone-to-Cortisol Ratio: A Preliminary Study

Date: 2021.04

This study examined the relationship between daily HRV and the testosterone-to-cortisol ratio during a high-intensity training program, suggesting HRV may help monitor recovery but may need to be paired with more specific assessments.

The very low-frequency band of heart rate variability represents the slow recovery component after a mental stress task

Date: 2017.08

This study proposes that the VLF band of HRV represents the slow recovery component following mental stress, while other HRV measures may reflect faster recovery mechanisms.

The role of the hypothalamic-pituitary-adrenal axis in neuroendocrine responses to stress

Date: 2006.12

This review discusses the major endocrine, nervous, and immune system contributors to the stress response and the importance of appropriate regulation for maintaining homeostasis and preventing stress-related disorders.