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Short answer — they often decouple. Peripheral (lactate) and central (HR) responses don’t always shift in lock‑step: with the kind of aerobic mileage you describe you’ll usually see the lactate curve shift right (you can go faster at the same lactate), while HR for a given workload may move differently and often more slowly. So 130 bpm today may not mean exactly what it did 4 months ago unless you verify it with testing [6] [2] [3].
Why, in brief
- Peripheral adaptations (more mitochondria, capillaries, better lactate clearance) move the lactate curve to the right — the same pace yields less lactate or the same lactate occurs at a higher pace/speed [6] [1].
- Heart‑rate changes for a given workload reflect central factors (stroke volume, blood volume, hydration, autonomic tone). Stroke‑volume (central) changes that lower HR at a given power tend to take longer to develop than many peripheral changes and can also be affected acutely by things like hydration/temperature [3] [8].
- Because the two systems adapt on different timelines and to different stimuli, the lactate vs speed curve and the HR vs speed curve can “gap out” (decouple) — e.g., AeT (lactate breakpoint) can move right while an HR inflection point moves less or later [2] [11].
What that means for your 130 bpm
- If your lactate curve has shifted right but central adaptations (SV) haven’t changed much yet, 130 bpm will correspond to a faster pace than it did 4 months ago — i.e., the same HR but lower lactate and higher speed.
- If you later develop significant central adaptation (higher SV), your HR at a given pace could fall further, so HR zones can change over months to years depending on the profile of adaptations [8] [3].
What’s missing from the excerpts (and from your question)
- The excerpts describe the patterns and mechanisms but do not give a precise quantitative rule for how many bpm will shift per unit of lactate or pace improvement, nor the exact timecourse for an individual. To be certain for you we need either repeated lactate tests or a consistent set of pace-vs‑HR logs to compare now vs 4 months ago.
Quick practical steps (general guidance)
- If you can: re‑test your AeT with lactate (or do a structured field test that gives lactate or a reliable threshold pace) to see whether the lactate breakpoint has moved relative to pace [1] [6].
- If you can’t test lactate, track sustainable pace for a given HR (e.g., 30–60‑minute steady runs at ~130 bpm) and compare to older data — improving pace at the same HR is a practical sign your lactate curve has shifted right relative to HR.
- Continue to monitor hydration, sleep, and temperature around tests since those affect HR independently of fitness [3].
- Use HR plus pace/RPE and, when possible, occasional lactate/threshold tests to re‑anchor zones rather than assuming a fixed bpm always means the same intensity [11] [8].
Would you like help designing a simple retest (lactate or field test) or reviewing your pace-vs‑HR training logs to quantify how much 130 bpm has changed for you?
Sources:
[1] Chapter 6: Everything you need to know about Training Zones — https://t.co/0jKwlRymNt
[2] Cardiac v.s. Peripheral Development for VO2 Max (#4) — https://t.co/m03vHMAdZx
[3] 2009-10-06__the-science-of-decoupling — https://t.co/6cPe5DFRIG
[4] First, Principles - The key ingredients in any successful training plan — https://t.co/2wgJfg42Qf
[5] Chapter 4: The Foundation of Fitness - Building a Strong Base — https://t.co/KC5Gp6eHzC
[6] ch07 — https://t.co/NILjSj7cvI
[7] Chapter 5: Specialization - Fine tuning your fitness for a fast race. — https://t.co/79PkeiF4mw
[8] ch11 — https://t.co/vb1FGZCoFQ
[9] 2007-08-16__interpreting-lactate-curves-for-ironman-athletes — https://t.co/lQDA0Rop4V
[10] 2007-11-09__interpreting-lactate-curves-coaches-presentation — https://t.co/Uh8LEByddV
@Vikeologist I am in MN. Get a tester, track levels. Over 4pcl take action. 2nd leading cause of lung cancer after smoking. You can do it yourself otherwise expect 2k.
Man. Don’t know how to explain it other than shock. Words cannot express the pain of this letdown. The frustration is unfathomable. I’ve worked my whole life to get to this moment and this is how it ends? Makes no sense.
Now that I’ve gotten surgery, I wish I could count the number of times people will tell me I’m going to “come back stronger”. What a cliche lol, this shit sucks. My foot feels like dead weight fam. But what’s hurting most I think is my mind. Feel like I’m rambling, but I know this is something I’ll look back on when I’m through this, as something I’m proud I fought through. It feels good to let this shit out without y’all seeing the kid ugly cry.
At 25, I’ve already learned that God never gives us more than we can handle. I know I’ll come out on the other side of this a better man and a better player. And honestly, right now, torn Achilles and all, I don’t regret it. I’d do it again, and again after that, to fight for this city and my brothers. For the chance to do something special.
Indy, I’m sorry. If any fan base doesn’t deserve this, it’s y’all. But together we are going to fight like hell to get back to this very spot, and get over this hurdle. I don’t doubt for a second that y’all have my back, and I hope you guys know that I have yours. I think Kobe said it best when in this same situation. “There are far greater issues/challenges in the world then a torn achilles. Stop feeling sorry for yourself, find the silver lining and get to work with the same belief, same drive and same conviction as ever.” And that’s exactly right. I will do everything in my power to get back right.
My journey to get to where I am today wasn’t by happenstance, I’ve pushed myself every day to be great. And I will continue to do just that. The most important part of this all, is that I’m grateful. I’m grateful for every single experience that’s led me here. I’m grateful for all the love from the hoop world. I don’t “have to” go through this, I get to go through this. I’m grateful for the road that lies ahead. Watch how I come back from this. So, give me some time, I’ll dust myself off and get right back to being the best version of Tyrese Haliburton.
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Proverbs 3:5-6 “Trust in the Lord with all your heart, and lean not on your own understanding; in all your ways acknowledge Him, and He will make your paths straight."
The question might seem trivial, but give it a moment’s thought:
Why does Venice 🇮🇹 float?
What does it rest on?
And, most importantly, why doesn’t it sink?
A Thread🧵 to explain it to you
This is where Jesus is said to have been buried — and then resurrected.
But is it the real tomb? How do we know?
Well, in 2016 it was opened for the first time in centuries... (thread) 🧵