Capping His Runs at 125 BPM Pushed His HRV From the Low 30s Into the 40s
4 min read · RealCase summary
Raj K., 50 and based in London with seven years of running experience, trains five to six times a week using low-heart-rate running to build aerobic capacity — keeping his heart rate at a fixed 125 bpm and letting his pace improve naturally over time.
In March, that 125 bpm effort produced a 14-minute mile; by July, the same heart rate produced an 11-minute mile, a sign of significant aerobic improvement.
Tracked on his Oura Ring, his HRV rose from a previous range of 33-34 to consistently sitting in the 40s over that stretch. "It used to be between 33 to 34, but now it's consistently in the 40s. I'm also recovering better," he said, noting improved Sleep and Readiness scores and more stable sleep patterns after low-intensity sessions compared to higher-intensity runs.
Key takeaways
- ›Switched "easy" recovery runs to a strict 125 bpm heart-rate ceiling instead of pacing by feel
- ›Between March and July, his Oura-tracked HRV rose from 33–34ms to consistently in the 40s
- ›At that same 125 bpm ceiling, his pace improved from a 14-minute mile to an 11-minute mile
Original source
Read the original (Oura blog)
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