Morning vs night HRV

Blog post by Marco Altini

Since I started working with Oura, I've been looking more closely at morning vs night HRV data. I collect my morning data using HRV4Training's camera measurement

See my last 30 days below. Great consistency in baseline changes for both heart rate and HRV between Oura’s night data and HRV4Training’s morning measurements 👌

I've tried to annotate the stressors, both positive and negative:

• a little extra alcohol intake around end of the year: affects night data more, as it is a "late stressor"
• consistent training, "high" volume and intensity, which typically lowers HR
• biofeedback 20 minutes per day. Possible effect on HRV

Morning and night measurements are both valid ways to capture changes in baseline physiological stress deriving from training and lifestyle stressors, as long as a few simple best practices are followed

I cover the basics of morning (and night) measurements, here, and go deeper on some of the nuances of night measurements, here