I’ve just posted a new blogpost where I’m sharing five insights that I’ve gotten from (statistically) exploring relationships between my personal resting Heart Rate Variability (HRV), sleep and physical activity data as collected with my Oura ring over the past 501 days.
To summarize my main findings:
- Low sedentary time, as well as high moderate and high vigorous physical activity predicted low subsequent nocturnal HRV (9.4% explained variance). So apparently my HRV takes a hit either when I’m very active, or not active at all.
- My resting HRV changed rather dramatically (structurally doubled) over the course of a year or so after some drastic lifestyle changes. For me personally, anekdotally explaining the longer term trends that I witnessed in my data were quite eye-opening.
- My resting HRV can be partially predicted using the HRV data of the previous three days in a time series (ARIMA (3,1,1)) model. To me, this shows tracking resting HRV might be useful as a proxy for detecting early signs of a negative feedback loop or downwards spiral (which is consistent with one of the hypotheses that I’m testing in my current PhD trajectory).
- My nocturnal HRV has a weak correlation (1.7% explained variance) with my Total Sleep Time (TST), and sleep stages explain 48.2% of the variance in my nocturnal HRV. The latter is most likely the result of Oura ring probably using HRV to categorize the actual sleep stages, but I found it fun to explore nonetheless.
- Low sedentary time and high moderate-to-vigorous physical activity (MVPA) predicted higher TST, whereas low TST predicted higher sedentary time. So apparently I sleep better if I’m not sitting around too much and am a bit more active, and am very inactive on days after a short night’s sleep, which makes sense I guess.
You can read the full blog post here: https://hermandevries.nl/2020/09/23/relationships-between-hrv-sleep-and-physical-activity-in-personal-data/
Feel free to share any suggestions or questions on the topic or just let me know if you’ve enjoyed the post!