Heart Rate Pacing vs Power Pacing: Which One Should Runners Choose

Introduction

Marathon pacing methods fall into three main categories: pace, heart rate (HR), and power. Pace is heavily influenced by terrain and wind; HR is affected by temperature, caffeine, and sleep; power is considered the most immediate and least externally disturbed metric. However, running power meters (such as Stryd) are not cheap—is it worth it? This article compares them item by item.

The Nature of the Three Metrics

HR-Based Pacing

Advantages: Inexpensive equipment (optical or chest-strap heart rate monitors start at a few thousand NT$), reflects the body’s true load, can detect over-fatigue.

Disadvantages: Cardiac drift—after running 30 minutes at the same pace, HR rises 5–10 bpm; start-line excitement commonly inflates HR by 10 bpm; temperature has a major impact—in Taiwan’s summer, training HR being 8–15 bpm higher than in winter is normal.

Best for: Training periods (scheduling workouts based on the five intensity zones Z1–Z5), first-time marathoners controlling pace to avoid starting out too fast.

Power-Based Pacing

Advantages: Immediate response, unaffected by temperature or cardiac drift, maintains target power on both climbs and descents, standardized comparison of performance across different weather conditions.

Disadvantages: Expensive equipment (Stryd costs around NT$8,000+), requires determining your individual CP (critical power, requiring all-out runs of 3 and 9 minutes), steep learning curve.

Best for: Elite/advanced runners chasing PBs, multi-terrain races (such as Wan Jin Shi or Tokyo Marathon with bridge elevation changes).

Marathon Pacing Reference Table (Using a Sub 3:30 Runner as an Example)

Practical Advice

First, a heart rate monitor is essential gear—regardless of which strategy you use, wearing a chest strap is recommended (more accurate than optical, ±1 bpm error vs ±5 bpm). Second, beginners should train with HR for 3 months to build body awareness before deciding whether to upgrade to a power meter. Third, do not switch to a new metric on race day—if you train with pace + HR, don’t suddenly look at power during the race; the cognitive load will hurt performance. Fourth, for the flat Taipei Marathon course, use pace as the primary metric and HR as secondary; for Wan Jin Shi and Tianzhong Marathon with elevation changes, consider referencing power. Fifth, during the multi-day taper, HR being 3–5 bpm higher than usual is normal (nervousness plus immune activity)—no need to panic.

Conclusion

There is no “best metric,” only “the combination that suits you best.” Most runners are advised to adopt a pace + HR dual-track approach, adding power if the budget allows. The iron rule on race day: watch HR for the first 10 km to control excitement, watch pace for the middle 25 km to maintain rhythm, and rely on willpower for the final 7 km. Tools are only aids—the true pacing master is the you who trained for 16 weeks.

Related Reading

• Running Watch Applications: Choosing Between Heart Rate, Pace, and Power Meters for Marathons
• Running Power Pacing: Stryd Running Power Meter Pacing Applications and Accuracy
• Heart Rate Zones vs Power Zones: Which Should You Watch for Road Cycling Training
• The Rise of Running Power Meters: Stryd Foot Pod Measurement Principles and Training Applications