The Lief App allows you to visualize the state of your body over time. There is a scrollable timeline that displays colored and patterned bars, each representing 5-minutes of your data. The data can tell a story about your day. Note: the following timeline's annotations are for illustrative purposes only.

Your Lief categorizes your unique HRV range into quintiles, where the 0-20th percentile=red, 20th-40th percentile=yellow, 40th-60th percentile=gray, 60th-80th percentile=green, and 80th-100th percentile=blue.

The 5 colors represent your 5 personalized physiological stress "zones." The color zones/bars help you interpret whether your HRV is relatively lower or higher. You have access to real time feedback, as well as historical data through your HRV bar graph. Lief learns more about you the more you wear it, so these zones become more accurate for your body, specifically, over time.

The previous timeline doesn't show any 5-minute periods where my body experienced significant psycho-physiological stress. There are a couple yellow and red bars which indicate stress, but these also have the cross-hatched pattern, which means I was also active at that time. During activity and exercise, our body naturally switches from parasympathetic into sympathetic nervous system dominance. Our heart rate will increase, and the heart rate variability will decrease. However, some days introduce noticeably more stress than normal. All we are doing physically is sitting down, but our mind may be pre-occupied by thoughts and worries, and we stop paying attention to our body and breath. Here is an example of a day's data that indicates it's probably time to treat yourself to some rest and relaxation:

This was an evening of rush and hurry. Working intensely on the computer, and fast-walking through the city to accomplish errands quickly, but not mindfully! Usually, we don't even realize this body state when it's present. Thankfully, the Lief does, and comes to the rescue with low zone-triggered "doses" which are 3-minutes of Downtime biofeedback. For example:

Finally, the Lief is also able to track when you're lying down. Our different poses and activities (lying, sitting, standing, walking, running) can have a dramatic effect on our HRV. Typically, lying down, and being soundly asleep, will raise our HRV. This makes sense! The act of lying down indicates to our body that we're ready for physical and mental rest and restoration. The Lief App will show your data while lying down with a shaded gray background:

The story Lief tells can at times be reinforcing to what we already know about our subjective experience, and other times comes as a surprise because we never would have noticed an interesting body state without Lief at our side. What story does Lief tell about you today?

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