Heart rate training means pacing runs by pulse ranges called zones. Runners commonly use five zones based on percent of maximum heart rate, from recovery to maximum effort.
Each zone marks a different intensity, so easy days and hard intervals get separate targets. Zone training helps runners hold back on easy days and push enough on workout days. It also depends on two practical choices: estimating maximum heart rate and using a monitor accurate enough for the task.
Medical information disclaimer: This article is for general educational purposes only and does not provide medical advice, diagnosis, or treatment. Always consult a physician or other qualified health professional about symptoms, medications, tests, or treatment decisions.
Table of Contents
- What the five zones mean
- How do you estimate maximum heart rate?
- How does heart-rate reserve personalize zones?
- Can you trust a wrist monitor?
What the five zones mean
Everyone Active describes the common five-zone breakdown as Zone 1 at 50-60% for recovery, Zone 2 at 60-70% for easy endurance, and Zone 3 at 70-80% for tempo. Zone 4 covers 80-90% for threshold running, while Zone 5 covers 90-100% for maximum effort.
Use the zones to assign purpose before you start. A recovery jog belongs in Zone 1, a long steady run fits Zone 2, and a comfortably hard tempo fits Zone 3. Save Zone 4 for sustained threshold work and Zone 5 for short maximum efforts.
How do you estimate maximum heart rate?
Maximum heart rate is the highest pulse you can reach during all-out effort. The Hospital for Special Surgery reports maximum heart rate estimates including 220 minus age as a rough start, with 207 minus 0.7 times age or 208 minus 0.7 times age slightly more accurate for older runners.
Age formulas remain imprecise for individuals. RunBuzz, citing Robergs and Landwehr 2002, reports errors around 10-20 beats per minute with a standard deviation near 10-12 bpm. Two runners of the same age can therefore have very different true zones.
How does heart-rate reserve personalize zones?
Heart-rate reserve is the gap between maximum heart rate and resting heart rate. Healthtus gives the Karvonen method as Target HR equals Resting HR plus intensity times maximum minus resting. For maximum 190 and resting 60, 70% effort equals 151 bpm.
That method raises targets for fit runners with low resting pulses. Garmin devices reflect the same idea by allowing zones by percent of maximum, percent of reserve, or percent of lactate-threshold heart rate. The manual says the watch needs maximum, resting, and lactate-threshold inputs, with auto-detection available.
Can you trust a wrist monitor?
Wrist optics measure pulse with light, while a chest strap measures the heart's electrical signal. In Cleveland Clinic testing reported by the American College of Cardiology, wrist monitors tested against ECG and chest strap worked fairly well at rest but lost accuracy during exercise. Errors could run high or low, and no wrist device matched chest-strap accuracy.
A treadmill-running study reported about 95% reliability and 98% accuracy during ramp-up running for one wrist device. Yet reviews note wrist optics often read low at higher intensities, with chest straps correlating about 0.99 with ECG versus 0.83-0.91 for wrists. Runners using zones, preparing for a marathon, or following doctor-set limits for heart disease should take extra care:.
- Use an electrical chest strap for zone workouts, races, and medical limits.
- Wear an optical sensor snugly and limit excess arm motion.
- Treat wrist heart rate as a guide, not an exact reading.