Why is my HRV not reduced after more intense trainings?

Normally, we expect HRV to drop after an intense training session. The acute HRV changes analysis looks at these day to day differences to analyze how your HRV changes following rest days or intese training days. However, this is not always the case and sometimes your acute HRV changes might not reflect training load. Here are a couple of reasons that might affect the analysis in the HRV4Training app:

• Make sure you annotated your trainings on the correct days. Browse your history to see that everything is actually properly annotated, otherwise this feature will not work.
• You might have very few trainings annotated, and therefore your data is not really meaningful for this analysis. Try to take measurements more often and remember to annotate manually your trainings.
• On the contrary, if you are training every day and sometimes multiple times per day, which might be common in triathletes and professional athletes in general, it could be more interesting to look at longer term HRV trends to better understand physical condition, instead of day to day variations. Check the "HRV trends" section under insights.
  
• Is training your main life stressor? If you are not a professional athlete and many other factors keep you stressed (e.g. work, family, traveling, etc.) it could be that these factors have higher impact on your HRV, and therefore the expected changes due to training are not showing up.
• Are you performing aerobic trainings? HRV typically is reduced after intense aerobic trainings, while things get a bit more complicated for other types of trainings.