Endurance Innovation 87 – Bruce Rogers on HRV Estimation of Aerobic Threshold

15 Jan Endurance Innovation 87 – Bruce Rogers on HRV Estimation of Aerobic Threshold

Posted at 10:25h in Coaching, Gear + Gadgets, Podcast, Training by
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University of Florida’s Bruce Rogers is on the show this week to explain a novel approach in using heart rate variability (HRV) analysis to identify the aerobic threshold in cyclists and runners.

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  • 2:30 Bruce’s introduction to HRV
  • 7:30 defining heart rate variability (HRV) and its response to exercise
  • 11:45 the non-linear HRV index DFA a1 (alpha 1)
  • 12:30 looking at fractals on random walks
  • 17:00 a discussion of exercise intensity distribution and thresholds
  • 20:00 the challenges with measuring or estimating the aerobic threshold (aka LT1, VT1)
  • 26:00 A new detection method defining the aerobic threshold for endurance exercise and training prescription based on fractal correlation properties of heart rate variability
  • 28:30 3 ways to determine LT1 through HRV DFA a1 analysis
    • Progressive ramp test past estimated LT1 and using Kubios for analysis
    • Constant 5-8’ power / pace intervals and using Kubios for analysis
    • Constant 6-8’ power / pace intervals using HRV4T Data Logger
  • 36:30 using the Data Logger for discrete testing vs live ride analysis
  • 42:45 equipment needs
    • Kubios free or premium
    • HRV4T Data Logger, using workout mode with 2’ intervals
    • HR Straps: Polar H-series
  • 50:15 shortcomings of HRV DFA a1 analysis
    • Missed beat artifact >5% in intense training or in populations with cardiac arrhythmias
    • A low-quality signal analysis by software
    • No test data for female athletes
    • So far only tested on cycling and running

Take a look at Bruce’s excellent blog and follow him on Twitter.
For a review of HRV, have a listen to our interview with HRV4Training founder Marco Altini.
The HRV4T HRV Logger can be found in the Apple Store.

3 Comments
  • Pierre D
    Posted at 05:42h, 24 February Reply

    Amazing podcast guys !!
    Could you please share your thought about cardiac drift and evolution of A 1 ? I assume that even at Z1 power (during a long ride), when HR start to drift, A1 is decreasing and cross 0.75. Am I right ?

    • Michael Liberzon
      Posted at 18:19h, 25 February Reply

      Thanks for the note Pierre. I’ve put the question to Bruce, and he tells me that while your hypothesis sounds legit, there is not yet enough evidence to support it.

  • Pingback:Endurance Innovation 97 - Bruce Rogers with Updates to DFA a1 Analysis and Garmin Metrics - x3training
    Posted at 12:13h, 25 March Reply

    […] 1:00 Have a listen to our first chat with Bruce Rogers […]

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