Using HRV data to measure response

Has anyone been using their HRV data on either their Oura ring or their Apple Watch (or similar devices) to monitor response to US. My HRV is terrible for my age, lucky if I can get it above 30. I was wondering whether this is a useful measure to help guide the effectiveness of this treatment. Particularly as some symptoms are intermittent and it may be difficult to no if there is improvement

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