Setting Heart Rate Zones for Cycling Training: Various Methods for Estimating Maximum Heart Rate

Introduction

Everything in heart rate training hinges on knowing your “maximum heart rate (HRmax).” With an accurate HRmax, you can correctly define training zones 1–5, ensuring every session is conducted at the intended physiological stimulus intensity. However, estimating HRmax is not as simple as it seems—the accuracy of formulas circulating online varies widely, and individual differences can differ by more than 20 bpm. Setting training zones with an incorrect HRmax can, at best, diminish training effectiveness, and at worst, unknowingly push you into excessively high-intensity training.

This article systematically introduces three primary methods for determining HRmax, analyzes their respective pros and cons, and provides practical considerations for Taiwanese cyclists.

Method 1: Formula Estimation

The most widely known formula is:

HRmax = 220 − age

This formula is simple to use, but its error margin is substantial. Research shows the standard deviation of this formula is as high as ±10–15 bpm, meaning a 40-year-old cyclist’s actual HRmax could fall anywhere within a broad range of 165–195 bpm.

More accurate alternative formulas:

Recommendation: Formula estimation is only suitable as a starting reference for beginners. If your training goals are clear, you should obtain a more accurate value through actual testing as soon as possible.

Method 2: Field Testing

Field testing involves pushing your heart rate to its peak through strenuous exercise without laboratory equipment, using a heart rate monitor to measure it directly. Here are two common cycling field test methods:

Method A: Hill Sprint Test

1. Warm up thoroughly for 20 minutes (gradually increasing intensity to Zone 3)
2. Find a 5–8 minute climbing section (5–8% grade)
3. Ride at full effort for the first half until you can no longer accelerate
4. In the latter half, shift to a lighter gear and continue pedaling hard at a high cadence
5. Perform a “sprint” for the final 30 seconds; the highest value displayed on your heart rate monitor is your estimated HRmax

Method B: Ramp Test

1. Start at a low power output (e.g., 50% of FTP)
2. Increase power by a fixed amount each minute (e.g., 20W)
3. Continue until you can no longer maintain your pedaling cadence
4. The highest heart rate value during the test serves as your HRmax estimate

Precautions:

• Avoid strenuous training 24 hours before the test
• Rest adequately on the test day and ensure you are in good condition upon waking
• Those with a history of heart disease or a family history of it should consult a physician first
• Those over 40 are advised to undergo a baseline electrocardiogram (ECG) beforehand

Method 3: Recording During Races or Natural Sprints

The most accurate HRmax often appears during race sprints or the latter stages of spontaneous all-out climbs. If you have participated in mountain races, hill climbs, or road races, check the highest heart rate recorded in your race data—this is often the value closest to your true HRmax.

Conditions for use:

• Wear a chest-strap heart rate monitor (optical heart rate sensors have significant error during sprints)
• Confirm there are no obvious heart rate spikes (artifact signals) in the data
• Use the highest reading from multiple races or sprints as the baseline

Setting Five Training Zones Based on HRmax

Once you have an accurate HRmax, divide your training zones according to the following percentages:

• Zone 1 (Active Recovery): 50–60% HRmax
• Zone 2 (Aerobic Base): 60–70% HRmax
• Zone 3 (Aerobic Threshold): 70–80% HRmax
• Zone 4 (Lactate Threshold): 80–90% HRmax
• Zone 5 (VO2max): 90–100% HRmax

Using a cyclist with a measured HRmax of 185 bpm as an example:

• Zone 2: 111–130 bpm
• Zone 4: 148–167 bpm
• Zone 5: 167–185 bpm

Practical Recommendations

• Don’t blindly trust formulas: Especially for cyclists over 40, formula errors are larger; rely on actual testing
• Retest every 1–2 years: HRmax slowly declines with age, but training adaptations may also maintain it at a higher level
• Use a chest-strap heart rate monitor for testing: Optical heart rate sensors lag during high-intensity sprints, often yielding a lower HRmax
• Combine with a power meter: Cyclists with a power meter can train directly by power zones, reducing reliance on HRmax accuracy

Conclusion

Setting heart rate zones is the foundation of heart rate training. If the foundation is wrong, the entire training structure will be skewed. Taking the time for one serious field test to obtain your true personal HRmax, and setting training zones based on your own physiological characteristics, is homework every cyclist serious about training should complete. Accurate heart rate zones ensure every session is conducted on the correct channel.

Related Reading

• Cycling Heart Rate Zone Training: A Guide to Five-Zone and Seven-Zone Applications
• The Complete Guide to Running Heart Rate Zone Training
• Heart Rate Pacing Method: Practical Applications of Controlling Marathon Pace with Heart Rate Zones
• Heart Rate Running: Controlling Training Intensity with Heart Rate Rather Than Pace