Skip to content

Forum Archives

📣 Our community has moved!

After several years of incredible discussions, we've moved our community to a new home on Reddit where we can better serve our growing family of mountain and endurance athletes.

Join us at our new subreddit forum /r/evokeendurance for:

  • Training advice from our coaching team
  • Peer support and motivation
  • Gear discussions and recommendations
  • Trip reports and inspiration

This forum will remain archived so you can still access all the valuable content and conversations from over the years. However, all new discussions and coaching support now happen on Reddit.

Join us on Reddit
Viewing 2 posts - 1 through 2 (of 2 total)
  • Author
    Posts
  • #126540
    ryanarifin134
    Participant

    Hello! I was reading this blog post on the physiology of aerobic base training, and I had a question: does the “lactate shuttle” part of the aerobic energy pathway ever become the limiting factor of aerobic performance? In other words, is there a point in which the mitochondrial density of your slow twitch muscle fibers (in which training below your aerobic threshold improves) aren’t being fully utilized, and the bottle neck of your aerobic energy system is the speed/efficiency in which the molecules can transport lactate to the mitochondria dense slow twitch fibers (this efficiency which can be trained by training near your lactate threshold, but is also largely based on genetics)?

    Thanks so much for your insight, and I hope that question makes sense. And if you think any part of my above understanding of what is happening physiologically is incorrect – please let me know!

    #126623
    Avatar photoScott Johnston
    Keymaster

    Ryan:

    The lactate shuttle does become the limiter to your endurance at the lactate threshold.  By definition, the lactate threshold or anaerobic threshold occurs when the lactate removal rate just equals the lactate production rate.  Since this metabolic threshold represents your endurance limit and since the removal rate is dependent on the shuttle the shuttle becomes the limiter to your endurance.

    I hope this helps.  You might want to read this article https://evokeendurance.com/126579-2/

    Scott

Viewing 2 posts - 1 through 2 (of 2 total)
  • The forum ‘Training Theory/Methodology’ is closed to new topics and replies.