
Heart Rate VS. Power for Cycling Training (Science based coach explains...)
Road Cycling Academy PodcastShow Notes
Heart rate or power—what's the better tool for cycling training? In this episode, we break down the pros and cons of both, and why we believe power is the more practical, reliable metric for most cyclists. From pacing your efforts to tracking progress, we explain how power takes the guesswork out of training and why heart rate still has its place—just not as your primary guide. Full Transcript: Cam Nicholls (00:00): Welcome back to the RCA podcast, where today I'm joined again by the RCAs data nerd Ben Treble. And today we're going to be talking about zone two. Should you be following power or should you be following heart rate or should you be following both? And if you're following both, how does that actually work when one's staying in a straight line, the other one's going all over the place. So Ben, what's your answer?
Ben Treble (00:27): I prefer to use power both. I like definitely both, but I would start with power.
Cam Nicholls (00:34): Okay, that's a bit controversial, especially somebody who loves science and digs into all the papers. Why do you prefer power? Is that a scientific, I feel like this is maybe the first time you're going more on the practical side than the scientific side. Is that fair to say?
Ben Treble (00:51): Yeah.
Cam Nicholls (00:53): Oh, there you go. So why is that? Tell us why
Ben Treble (00:56): Heart rate for everyone listening, maybe there's some basics. Heart rate is an internal measure of our stress, which is fantastic because we have to listen to that and it's a metric we should always be accounting for and learning to listen to. Power is an external metrics, so in that respect, power is very reliable. Power doesn't discriminate when you are tired. Power doesn't discriminate when it's windy or cold. You are fatigued. 300 watts will always be 300 watts provided
Cam Nicholls (01:29): You calibrated.
Ben Treble (01:30): Yeah, provided you've got a good power meter .... The heart rate though, whilst it's a very good internal measure and scientifically you'd probably say a better measure for zone two in some respects because there is drift to account for especially in longer rides. My challenge with heart rate for zone two rides is simply it's harder to follow because your heart rate takes time to respond to the work. And how do you respond to that? If you suddenly see your heart rate has slowly crept up 15 beats throughout the ride, how much do you decrease your intensity to try and drop it? Because you most likely will drop it too much. Your heart rate takes time for this up and down, right? The response of it equally comparing workout to workout gets difficult because how do you account for all these other external stresses that your heart accounts for? (02:34) Things like stress, caffeine, sleep, all these good things. So, I think heart rate is an amazing measure to keep an eye on for recovery rides. It's like the control check and you can do the same. You could use it as a control check for zone two rides, but I think it starts getting a bit complicated for many riders. So in that sense, I take a more practical approach with zone two, I would say you follow the power because it's easy and simple to understand to get it right, focus on trying to just hold a steady power outdoors. That's difficult enough as it is for most people. And once you get doing that, when you compare ride or ride, you can measure the heart rate drift and track the adaptation pretty well. But if you're just doing it on a heart rate, it starts to get very difficult to account for all the other things and see how you're responding.
Cam Nicholls (03:26): So what do you make of these guys that go out and ride? They do a three or four hour, zone two ride. They're trying to keep themselves in an aerobic state and as soon as they're following power initially, but they're looking at their heart rate, but as soon as their heart rate starts stepping into sort of that zone three, zone four threshold
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