Recreational Marathoner · Sydney

A 35% jump in marathon recovery (RMSSD) without more training

A Sydney-based marathoner saw their HRV (RMSSD) improve by 35% in 10 weeks, significantly enhancing their marathon recovery.

Abstract cream-and-slate line illustration on Kokorology paper, drawn for A 35% jump in marathon recovery (RMSSD) without more training

No more bonking: Marathon recovery, stress, and beating the plateau

A recreational marathoner in Sydney dropped their perceived exertion from a 7/10 to a 5/10 and boosted their HRV (RMSSD) by 35% over ten weeks, getting off the performance plateau that had stalled their training. Most people would call a training slump like this 'burnout', but that's not quite right. This was a classic case of an unregulated nervous system.

The presenting state

I hear this a lot: training hard, ticking all the boxes, but the body just isn't keeping up. Recovery feels like wading through treacle, and every long run extracts a higher tax than it used to. My client was logging consistent mileage — proper dedication, no slacking — but felt perpetually under-recovered, a state of being tired but wired. Their watch told them they were pushing, but the results weren't there. Each session felt harder, even when the pace wasn't increasing. This is often described as a performance plateau, but it's more accurately a biological signal.

We're not talking about a lack of effort; we're talking about a nervous system stuck in high gear. The sympathetic nervous system, your fight-or-flight accelerator, was dominating. This keeps the body primed for action but makes recovery—the parasympathetic nervous system's job—a real uphill battle. This constant low-grade activation, where the body's resources are constantly mobilised, contributes to what we call allostatic load — the wear and tear on the body from chronic stress McEwen, 1998. It stops you from adapting to the training.

The protocol

My approach here wasn't about adding more training or new supplements. It was about teaching the body to hit the brakes properly, letting the recovery mechanisms actually do their job. We focused on recalibrating the autonomic nervous system balance by building specific daily practices. It's like teaching an overzealous accelerator pedal to recognise when the brake is being pressed.

Here's what we did:

  1. Consistent wake-sleep schedule, even on weekends.
  2. Strategic exposure to natural light first thing in the morning.
  3. Targeted nasal breathing exercises for 10 minutes, twice daily Lehrer et al., 2020.
  4. Gentle evening routine focused on reducing light and noise.
  5. Specific post-run cool-down incorporating diaphragmatic breathing.
  6. Daily short walks in nature, without headphones or podcasts.
  7. A 15-minute 'no-screen' window before every meal.

What changed

Within a month, the daily HRV readings started to show a clearer pattern of recovery, climbing steadily. After ten weeks, his RMSSD — a key metric for parasympathetic activity — had jumped by 35%, from an average of 32 ms to 43 ms. This wasn't some huge leap; it was the consistent accumulation of small, intentional acts. The real change wasn't just in the numbers; it was in the felt experience.

His long runs started feeling less like a battle and more like a strong, steady effort. His perceived exertion for a standard 15km run at race pace went from a grinding 7/10 to a comfortable 5/10. Sleep quality, measured via wearable tech, showed reduced fragmentation and more consistent deep sleep cycles. I noticed a distinct pattern in his HRV: earlier in the process, the 'recovery days' still showed suppressed RMSSD readings, almost as if his system couldn't quite believe it was allowed to relax. By week six, those recovery days were clearly distinct, with higher, more stable HRV, indicating better capacity to downregulate. That's the body learning to trust the recovery.

You can't out-train an overactive nervous system. The recovery is the training.

TL;DR

This recreational marathoner from Sydney was hitting a performance wall despite dedicated training, feeling constantly tired and taking longer to recover. We focused on regulating his autonomic nervous system, using simple daily habits to boost his recovery capacity. Over ten weeks, his HRV improved by 35%, and perceived exertion dropped, allowing him to push through his plateau and enjoy his running again by teaching his body to properly rest and adapt.

Where to take this next

Many of us push harder, thinking that's the only way forward. But sometimes, the most effective 'training' is actually learning to switch off the internal alarm bells. Understanding how your daily habits contribute to or detract from your nervous system's ability to recover is the real secret to sustained performance, whether you're chasing a marathon PB or just trying to feel less frazzled.

If you're interested in digging deeper into your own body's signals, there are ways to map your current state and build a tailored plan.

  • Dive into the mechanics of nervous system regulation at /anchors.
  • For personalised guidance, my 1:1 coaching slots are available at /coaching.
  • Grab the 7-Day Reset to start building better recovery habits today at /reset.

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