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Stress level after cardio sessions query

I am rowing 45 minutes in zone 2 every day and have observed that my Stress level is between Medium and High thereafter, for many hours, essentially for the rest of the day and sometimes part of the night. Stress if a very important factor in Sleep score, so to minimise the risk of having this Stress extend into the night and get sh*t sleep scores, I do my cardio early in the morning at 8am. But even so, the Stress sometimes extends until the following night. See below an example.

My question is relatively simple: is this a sure sign that I am overtraining ? These sessions are not hard. Well, they're zone 2 sessions so they're not supposed to be hard anyway.

 if you read this, any chance you could take a look at your Stress level patterns after exercising and give me a sense of what you have at your end ? Do you have an opinion about if I should do something about it ?

I know that other factors may impact Stress, but the reasons why I believe it is mainly driven by my cardio sessions is because first, high levels of Stress appear just after I exercise, and second, on Sundays, which are my resting days, my Stress level is largely into the blue. Let me post a screenshot of yesterday's resting day as an example.

Thank you.

  • It does not seem like I have increased stress after workouts in general. Some days the stress level is even lower after workouts, since it relaxes my mind. On the days where I have stress after a workout, it is because I have lots of things to do.

  • Okay, thank you for the response.

  • I was doing a little bit of research the other day and came across this study:

    https://www.ncbi.nlm.nih.gov/pmc/articles/PMC9439241/

    I believe it is worth a read on the subject.

  • Thanks. I think the report is a bit too complicated for me to understand properly. But I guess this is the basis of what FirstBeat Analytics algorithms are doing inside our watches.

  • The gist of the study is that exercising has the effect of dropping HRV, and, interestingly, even more so in athletes than people less trained.

    And the reason why I posted it is because in your case you mentioned earlier that your stress doesn't really rise (and consequently your HRV doesn't really drop since it's the same thing). Perhaps you have... an... alien physiology !

    When asking around my friends who have a Garmin watch, what I observed is that how long stress remain elevated is very variable, starting from 2 hours, to... like 8-9 hours. It's all over the place. Some variation is of course to be expected. In my case also, how long it lasts depends on the activity: when running, it will be a lot shorter than rowing. Which is a bit puzzling since 95% of my cardio is rowing.

    It's an interesting paper.

  • But I guess this is the basis of what FirstBeat Analytics algorithms are doing inside our watches.

    Yes, I totally believe so.

  • I generally exercise a lot, currently more than 800 hours per year, but the exercise is mostly low intensity. That could explain why I don't get much HRV drop, because my body is used to it, and I am not pushing myself much.

  • This is what the study says:

    " In our study, individuals with higher Cardio Respiratory Fitness (aka you ovekvam) start their exercise with a higher HRV due to their high vagal tone and have a faster subsequent decrease of HRV when their HR increases during exercise due to the faster withdrawal of their parasympathetic activity".

    This, in my mind, should mean higher stress for you than less trained individuals. Again, this is the gist of the study and what I find interesting.

    Now, the study also says the following:

    "This HRV decay constant decreases (i.e. a faster decay of HRV when HR increases) for athletes with higher cardiorespiratory fitness".

    This (read in conjunction with a few other things in the study, sorry I can't quote everything) would also mean that the HRV drop will be smaller as you are training far away from your VO2Max. This would tend to validate your statement that "you are not pushing yourself much" being the reason for the lack of HRV drop. In my case and to take an extreme example... if I go hiking, my stress level will not increase as well.

    Could you do me a favor.

    Next time you do an HIT or HIIT session, could you take a look at your stress level and let me know how it was compares with your usual, slow paced sessions ?

  • Here is a day 2-3 weeks ago when I competed in an indoor triathlon. This was a very hard effort where I was pushing myself to my limit. As you can see, there was quite a bit of stress measured during that day.

  • Ok I appreciate the feedback, exactly what I was looking for. So following this very hard effort, your HRV drop ("decay" as the study calls it) lingered for close to 7 hours after you finished it.

    How's your VO2Max roughly by the way again ?