A low HRV score indicates your body is less resilient to changing situations. Often people who are less stressed and happier will have a higher HRV. Your HRV score shows how well your body is adapting to different kinds of challenges. Often, your HRV is an indicator of the balance between the activity of the two branches of the ANS. It helps balance out the sympathetic nervous system and calm your body down, slowing your heart rate and blood pressure. Parasympathetic nervous system: The parasympathetic brand of your ANS is active when you’re relaxed. It’s your fight or flight response, that increases your heart rate and blood pressure. Sympathetic nervous system: The sympathetic branch of your ANS is active when you’re under stress. It’s divided into two main parts: your sympathetic nervous system, and your parasympathetic nervous system. Your heart is controlled by your autonomic nervous system (ANS) - this is a part of your brain and nerves that operate without you having to think of them. Your brain and your nervous system tell your heart rate when it needs to speed up and work harder. Some medications can affect your heart rate variability, and your HRV tends to decrease as you get older. If you’re out on a run, or you’re particularly stressed about something, your heart rate will increase. If you’re relaxed or sleeping, your heart rate will slow down.
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