How to Measure and Improve Anxiety With Heart Rate Variability

TL;DR

Heart rate variability (HRV) measures how well your nervous system switches between fight-or-flight and rest-and-digest states, making it a numerical marker of resilience. Higher HRV means better emotional regulation and health. Slow-paced breathing at around six breaths per minute is one of the most effective ways to raise HRV and calm anxiety.

Transcript

Anxiety is not just in your head, it's in your body. And specifically it's triggered in your nervous system. Today we're going to talk about how you can use heart rate variability as one way to get a numerical measure of how resilient your nervous system is and how you can use HRV to actually train your nervous system to calm anxiety more efficient... Read More

Key Insights

• Heart rate variability is the measure of how much difference there is between your fast heartbeats and your slow ones, reflecting how well your nervous system switches between the parasympathetic and sympathetic states. Higher HRV signals greater health, resilience, and adaptability.
• The autonomic nervous system controls heart rate and handles roughly 90% of the body's subconscious functioning, including the stress response, digestion, and immune system, operating through fight-or-flight and rest-and-digest states.
• The sympathetic fight-or-flight state releases adrenaline and cortisol, raising heart rate and sending blood to big muscles. It helps in small doses, but chronic activation harms the immune system, gut, and muscle tension.
• The parasympathetic rest-and-digest response relaxes the body, aids healing and digestion, activates the immune system, slows the heartbeat, and turns on peristalsis that supports the digestive system.
• Low HRV is associated with physical problems including cancer, inflammation, blood pressure, depression, chronic stress, pain, low emotional flexibility, anxiety, and quicker aging, indicating the body may be stuck in alert mode.
• Slow-paced breathing at around six breaths per minute, about five seconds in and five seconds out, is one of the most effective ways to improve HRV and reach cardiac coherence.
• Cardiac coherence occurs when breathing, heart rate, and blood pressure sync into a smooth, steady, synchronized wave called the resonance frequency, signaling the nervous system that it is safe to calm down.
• HRV is a measure of vagal tone, and you can train the vagus nerve to be strong through mindfulness, meditation, yoga, and breath work, with HRV quantifying how effective those techniques are.

Questions & Answers

Q: What is heart rate variability and why does it matter?

Heart rate variability is the measure of how much difference there is between your fast heartbeats and your slow ones. Over one minute, your heart speeds up when you breathe in and slows when you breathe out. More deeply, HRV measures how good your nervous system is at switching between the parasympathetic and sympathetic states. A higher HRV means you are healthier, more resilient, and better able to adapt and calm yourself.

Q: How can I improve my heart rate variability?

Slow-paced breathing is one of the most effective ways to improve your HRV. It is as simple as breathing at around six breaths per minute, meaning about five seconds to breathe in and five seconds to breathe out. Practicing mindfulness, meditation, yoga, and breath work also stimulate the vagus nerve and strengthen vagal tone. HRV lets you quantify how effective these techniques are by showing what is physically happening in your body.

Q: What is cardiac coherence and how do you achieve it?

Cardiac coherence is when your body's systems take on a smooth, steady, synchronized wave. Normally your breathing, heart rate, and blood pressure each oscillate on their own, especially when stressed. In coherence they all sync up and smoothly interact, reaching what is called the resonance frequency. The easiest way to achieve this is resonance frequency breathing, slowing your breathing to match your heart rate, which tells your nervous system to turn on the rest-and-digest response.

Q: How does the autonomic nervous system affect anxiety?

Your heart rate is determined by the autonomic nervous system, the subconscious part that handles 90% of your body's functioning, including stress response, digestion, and immune system. It has two states: sympathetic fight-or-flight, which releases adrenaline and cortisol and raises heart rate, and parasympathetic rest-and-digest, which relaxes and heals the body. Anxiety lives in the nervous system, so being able to switch into the parasympathetic state helps calm anxiety.

Q: What does a low HRV indicate about your health?

A constantly low HRV means your body is probably stuck in alert mode or stress mode, devoting all its energy to performance instead of healing, digestion, or the immune system. Low HRV is associated with physical problems like cancer, inflammation, blood pressure issues, depression, chronic stress, pain, low emotional flexibility, anxiety, and quicker aging. Trauma, PTSD, and chronic stress can all lower HRV because you are stuck in the fight-flight-freeze state.

Q: How can you measure your heart rate variability?

The easiest way to check your HRV is to buy a Bluetooth heart rate monitor and use the free app Elite HRV. You can also roughly measure HRV with an Apple Watch, but it is not very accurate or responsive, though it may give you an idea without buying something new. For active training toward your resonant frequency, programs like HeartMath or Flowly, a VR system with a heart rate monitor funded by an NIH grant, walk you through the process.

Q: What are the benefits of a high HRV?

A high HRV means your body is healthy and adaptable, and your nervous system can turn on when needed and relax when needed. It can feel like a flow state where you are engaged, active, and clear. Controlled studies show high HRV improves anxiety, depression, asthma, fibromyalgia, chronic pain, and sleep. People with high HRV are better at regulating emotions, controlling impulses, and processing information.

Q: Why does slow breathing help calm the nervous system?

Breathing at a slow rate of around six breaths per minute gets you into a state of cardiac coherence, where your heart rate, respiratory rate, and blood pressure sync up and smoothly interact at the resonance frequency. Reaching this resonant frequency essentially tells your body you are safe and you can calm down, signaling your nervous system to turn on the rest-and-digest response. You can feel your body become calmer, more centered, and more settled.

Summary & Key Takeaways

• Anxiety is not just in your head but in your body, triggered in the nervous system. Heart rate variability gives a numerical measure of how resilient your nervous system is by tracking how well it switches between the parasympathetic and sympathetic states. Higher HRV means greater health and adaptability.

• The autonomic nervous system runs 90% of body functioning through two states: sympathetic fight-or-flight, which releases stress chemicals and raises heart rate, and parasympathetic rest-and-digest, which relaxes the body and aids healing. Being stuck in either state, especially chronic stress, lowers HRV and causes health problems.

• Slow-paced breathing at six breaths per minute produces cardiac coherence, syncing breathing, heart rate, and blood pressure into a resonance frequency that calms the nervous system. You can measure HRV with a Bluetooth heart rate monitor and the free Elite HRV app, or train with programs like HeartMath or Flowly.