Heart Rate Variability and Its Connection to Your Health

Heart Rate Variability (HRV) is the variation in the time interval between successive heartbeats. A healthy heart does not beat at a perfectly regular rhythm; instead, it is constantly adapting to your body's needs. Thus, HRV is a measure of the changes in your heart rate that occur in response to internal factors (age, genetics, health status) and external factors (work stress, relationships, environment).

Both internal and external factors can impact your HRV.

In recent years, there has been growing interest in HRV as a tool to assess overall health and well-being. Research has shown that HRV is connected to several health indicators, including stress levels and cardiovascular health.

Low HRV has been linked to a range of health problems, including cardiovascular disease, diabetes, and depression. Higher HRV is generally considered to be a sign of better health and resilience. It has been associated with improved cardiovascular function, better cognitive performance, and reduced stress and anxiety.

Let’s get into how HRV is connected to your health and well-being.

HRV and Your Nervous System

HRV is an indicator of the activity of the Autonomic Nervous System (ANS) and its effect on your heart. The ANS is divided into two branches: the Sympathetic Nervous System (SNS) and the Parasympathetic Nervous System (PNS). These work together to maintain the balance and homeostasis of your body’s functions. The sympathetic branch is responsible for the "fight or flight" response, while the parasympathetic branch is responsible for the "rest and digest" response.

As we mentioned, a healthy heart has a high degree of variability in the time between heartbeats, with small fluctuations between beats. HRV reflects the ability of your ANS to adapt to different conditions and stressors, and its decrease is often associated with various health problems, such as cardiovascular disease, diabetes, depression, and anxiety.

Stress

One of the most significant applications of HRV is its use as an indicator of stress levels.

When the body experiences stress, the sympathetic nervous system is activated, leading to a faster heart rate and lower HRV. This is the body's natural response to stress, but if stress is chronic or long-lasting, it can lead to severe chronic health problems.

By monitoring HRV, individuals can get an idea of how their body is responding to stress and whether they need to take steps to reduce it. Techniques like deep breathing and meditation can be helpful in reducing stress and improving HRV. By improving HRV, individuals may be able to reduce their risk of health problems related to chronic stress, such as cardiovascular disease and depression.

Relaxation techniques like meditation or deep breathing can help your body get back to a “rest and digest” state.

Cardiovascular Health

HRV has also been found to be a predictor of cardiovascular health. Several studies have shown that individuals with low HRV have a higher risk of cardiovascular disease and other significant health problems. One study found that reduced HRV was associated with an increased risk of developing heart failure, while another study found that HRV was a predictor of sudden cardiac death.

Measuring HRV

HRV can be measured in a number of ways, including through wearable devices that track heart rate variability over time. By monitoring HRV, individuals can gain insights into their overall health and well-being, and identify areas where they may need to make changes to improve their health.

Conclusion

HRV is a valuable tool for assessing overall health and well-being. But once you have measured HRV, how do you actually go about increasing it?

HealthQb has solved this problem. In combination with the BioPsychoSocial model, we identify the specific areas of your health to focus on so that you can see an improvement in your HRV. In doing so, we help you sustainably improve your health and well-being in the long term. Get in touch to learn more.

Sources

Lehrer, P. M., & Gevirtz, R. (2014). Heart rate variability biofeedback: how and why does it work?. Frontiers in psychology, 5, 756. https://doi.org/10.3389/fpsyg.2014.00756

Shaffer, F., & Ginsberg, J. P. (2017). An Overview of Heart Rate Variability Metrics and Norms. Frontiers in Public Health, 5, 258. https://doi.org/10.3389/fpubh.2017.00258

Cooke, W. H., Carter, J. R., & Wachtel, R. E. (2016). Cardiovascular control during exercise: the central role of the arterial baroreceptor reflex. The Journal of Physiology, 594(24), 6899-6911. https://doi.org/10.1113/JP271078

Kleiger, R. E., Miller, J. P., Bigger Jr, J. T., & Moss, A. J. (1987). Decreased heart rate variability and its association with increased mortality after acute myocardial infarction. American Journal of Cardiology, 59(4), 256-262. https://doi.org/10.1016/0002-9149(87)90795-8

Nabati, M., Aliakbarzadeh, Z., Abednazari, H., Ahmadi, M. T., & Kheirouri, S. (2016). Heart rate variability and risk of type 2 diabetes mellitus: A systematic review and meta-analysis. International Journal of Cardiology, 218, 49-55.

Pecanha, T., da Silva-Júnior, N. D., Forjaz, C. L., & Lima, A. H. (2019). Acute and chronic effects of exercise on heart rate variability in healthy older adults: a systematic review and meta-analysis. Journal of Applied Physiology, 126(1), 51-68. https://doi.org/10.1152/japplphysiol.00590.2018
Shaffer, F., McCraty, R., & Zerr, C. L. (2014). A healthy heart is not a metronome: an integrative review of the heart's anatomy and heart rate variability. Frontiers in psychology, 5, 1040. https://doi.org/10.3389/fpsyg.2014.01040

Shaffer, F., & Venner, J. (2013). Heart rate variability analysis of outcome in chronic pain patients: a literature review. Biofeedback, 41(3), 130-140. https://doi.org/10.5298/1081-5937-41.3.01
Smith, M. L., Hudson, D. L., & Graitzer, H. M. (2021). Heart rate variability and psychological stress: a review. Journal of psychophysiology, 35(1), 1-15. https://doi.org/10.1027/0269-8803/a000276