How Much Training Is Enough & Why Heart Rate Still Matters – With Dr Ibrahim Akubat and Dr Martin Buchheit

Listen to the episode now or find us on Spotify and Apple Podcasts.

Show Notes

  1. Bring heart rate back into the conversation. Ibrahim and Martin revisit what makes it so powerful for understanding training load and adaptation.Their analysis across years of data suggests about 30 minutes above ~85–90% HRmax is enough to maintain aerobic fitness. The key takeaway? The concept matters more than the number. Use your own data to find your team’s threshold.
  2. Don’t just chase data, understand the dose and the response. A 10-minute increase in “time in zone” might boost aerobic capacity by 1–2%, but it also adds fatigue. Context is everything. For a player recovering from injury, low-intensity, longer-duration sessions may help rebuild mitochondrial size, while heat exposure or upper-body ergometers can sustain internal load when lower-limb work isn’t possible. The smartest coaches monitor both the stimulus and the response to make truly evidence-based adjustments.



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Have you ever thought about what tools are best for telling us when to apply HIIT the next time? How do we know when we will handle it again without driving our athlete into overtraining or injury risk? If you’ve read our ​book​ or taken our ​course​, you’ll know about how important this variable will be when we look to design the ideal program. Both heart rate variability and subjective comments were key factors we discussed. But is one better than the other?
Maybe. We’ve stumbled upon an incredible study that might just help clear our thoughts on the matter in terms of athlete readiness and when to apply HIIT again in the future to maximize performance potential. The blog post written by ​Diego Hilgemberg Figueiredo​ compares training plans guided by either HRV or subjective inner feelings. The findings may surprise you. Check out a sneak peak in the graphic below as to why heart rate and HRV can’t always bring us certainty around readiness to perform. They’re good, and helpful, but you must know your context! Combine it with feel to get the most power in your programming.

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