Cycling Heart Rate Zone Training: A Guide to the 5-Zone and 7-Zone Systems

Introduction

“My heart rate stayed around 140 today, so it must have been a solid workout!” Is that judgment correct? Not necessarily. 140 bpm means completely different things to different people, because heart rate training zones must be set individually based on your own maximum heart rate. Heart rate zone training is the most popular and easiest entry point for structured training. This article introduces the two most commonly used systems today — the 5-zone and 7-zone models — to help you choose the framework that fits you best.

The Foundation of Heart Rate Zones: Find Your Maximum Heart Rate First

Maximum heart rate (HRmax) is the baseline for every calculation. The common estimation formula (220 − age) can be off by ±10–15 bpm, so whenever possible you should determine it through an actual field test:

How to test your maximum heart rate: After a thorough warm-up, ride up a steep 3–5 minute climb (such as a short hill near Xianji Rock or Bitan Bridge in Taiwan), and sprint all-out for the final 30 seconds. The highest value recorded by your heart rate monitor is your estimated HRmax. Repeat 2–3 times and take the highest reading.

The 5-Zone Heart Rate System (Coggan System)

This is the most widely used system, often paired with power-based training, and it maps clearly onto FTP:

The 5-zone system is simple and easy to understand, making it well suited to beginners and riders with limited training time. Most online training platforms used in Taiwan (Zwift, TrainerRoad) are built around this system.

The 7-Zone Heart Rate System (Friel System)

Developed by triathlon and cycling coaching authority Joe Friel, this system is based on Lactate Threshold Heart Rate (LTHR) rather than maximum heart rate, and better reflects an individual’s current fitness state:

The 7-zone system is more useful for advanced riders, as it distinguishes more precisely between “sub-threshold” and “threshold” training, helping you design more refined training plans.

How to Estimate Lactate Threshold Heart Rate (LTHR)

Ride an all-out 30-minute time trial, and take the average heart rate of the final 20 minutes as your estimated LTHR. For example, if the average heart rate over the last 20 minutes of a 30-minute time trial is 168 bpm, then LTHR ≈ 168 bpm.

Choosing Between the Two Systems

• Beginners → Choose the 5-zone system: Simple to understand and highly compatible with Garmin and Wahoo devices — ideal for riders just starting structured training
• Advanced riders → Choose the 7-zone system: Enables more precise training prescriptions, especially when preparing for long-distance events or fondos
• Riders with a power meter → Prioritize power, use heart rate as a secondary reference: Power responds instantly while heart rate lags, so intensity should be controlled primarily by power

Limitations of Heart Rate Training

• Heart rate lag: It takes 30–60 seconds for heart rate to reflect a change in intensity, making it unsuitable for real-time monitoring during interval training
• Cardiac drift: On long rides, heart rate tends to rise later in the ride at the same power output — this needs to be accounted for
• Environmental factors: Heat, dehydration, caffeine, and lack of sleep all affect heart rate; the same power output may produce a heart rate 5–10 bpm higher in summer

Practical Recommendations

• Retest your maximum heart rate or LTHR periodically, especially after completing a full training cycle
• Set up personalized heart rate zones in Garmin Connect or the Wahoo app rather than relying on default values
• On long rides (such as an island circumnavigation), use heart rate as your primary monitoring metric to avoid overexertion in the early stages

Conclusion

Whether you choose the 5-zone or 7-zone system, the core purpose of heart rate training is the same: giving every ride a clear objective. Strap on a heart rate monitor, set your zones, and let the data tell you whether today’s ride was genuine training or simply enjoying the scenery. Both systems have value — but a clear distinction between them is what makes progress effective.

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