Running Heart Rate Training: Max HR Formula & Zone Guide

Most runners don’t pay much attention to heart rate. Yet heart rate is one of the most reliable indicators of training intensity and load — and ignoring it means leaving valuable feedback on the table.

I started paying close attention to my heart rate about three years ago, sparked by learning about Jakob Ingebrigtsen’s training — an athlete who became famous in the middle- and long-distance world almost overnight.

Jakob manages his training intensity with precise blood lactate measurements. As a recreational runner with no access to lactate testing, I wondered: could heart rate serve as a practical substitute?

Once I started monitoring heart rate accurately during runs, I found myself less likely to accumulate excessive fatigue and less likely to miss target paces in key sessions.

The results spoke for themselves — in autumn 2021, I set personal bests across multiple events and made a significant jump in overall performance.

In this article, I’ll walk through everything you need to know about heart rate training for running.

By the end, you’ll understand why heart rate management matters and have a clear sense of what heart rate to target in different types of training.

What Is Heart Rate Training? Why Runners Use It

Heart rate training for running means adjusting your training intensity based on your heart rate — specifically, how many times your heart beats per minute during exercise.

Different running intensities (i.e., different speeds) produce different training adaptations. The appropriate pace for a given runner can be estimated from past race performances.

But if you’ve never raced, your last race was a long time ago, or you’ve been sidelined by injury, you can’t reliably use past results to determine what’s right for you now.

Using heart rate as your benchmark makes it possible to train at the right intensity for your current fitness level — leading to more efficient endurance development and better protection against overtraining injuries.

How to Set Your Target Heart Rate for Running

Target heart rate differs from person to person, because max heart rate differs from person to person.

To train using heart rate, the first step is knowing your own max heart rate.

Calculating Your Max Heart Rate: The Tanaka Formula

Several formulas exist for estimating max heart rate from age. The most widely used is the one developed by Tanaka et al. (2001)※1, derived from data on more than 18,000 individuals.

208 − (0.7 × age)

For a 32-year-old, that gives a max HR of 185.6 bpm.

For me personally, this formula turned out to be quite accurate. That said, many runners find that their true max HR differs considerably from the formula’s prediction.

Max Heart Rate by Age: Reference Table

The table below compares max HR estimates by age using the traditional “220 − age” formula and the Tanaka formula (208 − 0.7 × age). The Tanaka formula tends to match measured values more closely.

Age	220 − Age (traditional)	Tanaka Formula (recommended)
Age 20	200 bpm	194 bpm
Age 25	195 bpm	191 bpm
Age 30	190 bpm	187 bpm
Age 35	185 bpm	184 bpm
Age 40	180 bpm	180 bpm
Age 45	175 bpm	177 bpm
Age 50	170 bpm	173 bpm
Age 55	165 bpm	170 bpm
Age 60	160 bpm	166 bpm

If you can’t determine your max HR from a formula, you can either get tested at a sports science facility or measure it yourself by running.

Two field protocols are commonly used: one on a treadmill and one on a 400 m track.

Personally, I find the treadmill protocol easier to control — outdoor conditions like temperature and wind can affect consistency on the track.

For accurate max HR measurement, you also need a reliable heart rate sensor. An armband heart rate monitor or a chest strap heart rate monitor is recommended.

Heart Rate Training Zones at a Glance

Below are the heart rate benchmarks used in running training. The “%HRmax” column shows the target range for each zone.

Keep in mind that these are percentages of your max HR, not absolute numbers. Without a reasonably accurate max HR estimate, heart rate training won’t work as intended.

How to Accurately Measure Heart Rate While Running

There are three main ways to measure heart rate while running.

Of these, armband and chest strap monitors provide the most reliable readings.

Optical sensors built into running watches are convenient, but their accuracy may fall short when you need precise heart rate zone control.

A study by Gillinov et al. (2017)※2 tested five commercially available optical heart rate monitors on a treadmill. Compared to a chest strap — which closely matched ECG readings — the optical monitors showed larger errors, and accuracy varied with exercise intensity and movement type.

For heart rate training to work at the level of precision described here, an armband or chest strap monitor is necessary.

Limitations of Heart Rate Training

Before relying on heart rate training, there are a few important pitfalls to keep in mind.

Inaccurate Max HR Can Throw Off Your Zones

The most common mistake is working from an inaccurate max HR.

Every training zone is defined as a percentage of your max HR. A heart rate of 160 bpm means something different for runner A than for runner B — intensity is relative to the individual.

Without a reasonably accurate max HR, you won’t be training at the intensities you think you are.

As described above, pinning down your max HR is the top priority before anything else.

Heat and Humidity Artificially Raise Your HR

Heart rate is heavily influenced by temperature and humidity. When both are high, heart rate rises noticeably at any given pace.

As spring turns to summer, running at the same pace will push your heart rate progressively higher. If you’re training by heart rate, the solution is to slow your pace until your HR returns to the target zone.

That said, maintaining exactly the same HR targets across seasons doesn’t always feel right. In my own experience, pacing down to match summer heat leaves my legs surprisingly fresh — because pace, not heart rate, is what drives muscular load.

Running at the same heart rate means running at different paces depending on the season: faster in winter, slower in summer. Higher pace means greater stress on the muscles.

In practice, applying identical HR targets year-round may pull you slightly off your intended training stimulus. Factor in your subjective fatigue and next-day recovery, and adjust your HR benchmarks to fit the season.

From my own experience, raising HR benchmarks by around 5 bpm in summer compared to winter works well. For example, if my winter easy run target is 125–140 bpm, summer calls for roughly 130–145 bpm.

Don’t Let HR Override Your RPE

Focusing too narrowly on heart rate can cause you to lose touch with perceived effort.

Perceived effort — how hard a workout feels — is separate from what your watch shows. If you fixate on hitting a target number, you may end up pushing through a session that genuinely feels too hard just to stay on pace with the data.

When this is combined with an inaccurate max HR, overtraining can follow.

Research confirms that RPE and heart rate don’t always align. Tibana et al. (2019)※3 found a weak correlation between RPE and heart rate during exercise (r = 0.38), while RPE correlated much more strongly with blood lactate (r = 0.66).

In other words, RPE gives you a different signal from heart rate — it reflects muscular fatigue and metabolic load. Combining heart rate data with how you actually feel gives you more precise intensity control than either measure alone.

My Own Heart Rate Training: Real Data

Here is a breakdown of my own training by heart rate zone. I wear an armband or chest strap heart rate monitor for every session.

Classified using the 5-zone system described in this article, my training distribution from May to August 2024 was as follows.

Zone	%HRmax		Share
Zone 1	60	72	25.6%
Zone 2	72	82	56.0%
Zone 3	82	88	9.7%
Zone 4	88	92	7.1%
Zone 5	92	100	1.7%

A different zone classification — the one used in a paper analyzing Henrik Ingebrigtsen’s training — produces the following breakdown.

Zone	%HRmax		Share
Zone 1	62	82	81.4%
Zone 2	82	92	16.9%
Zone 3	92	97	1.4%
Zone 4	97	100	0.3%

My own training follows a threshold training model, which concentrates volume in zones 3 and 4 of the 5-zone system.

This model was popularized by the Ingebrigtsen brothers — particularly Jakob — and is rooted in the training theory developed by former Norwegian elite runner Marius Bakken.

Looking at the Ingebrigtsen brothers’ training data, zones 3 and 4 account for around 25% of total volume — roughly 1.5 times my own share.

When training by heart rate, refer to the zone classification table from earlier in this article and target the zone that matches the adaptation you’re trying to develop.

There is no single “correct” answer for how much time to spend in each zone — it depends on your current fitness, how far away your goal race is, and what event you’re targeting.

References

※1 Tanaka H, Monahan KD, Seals DR (2001) “Age-predicted maximal heart rate revisited.” Journal of the American College of Cardiology

※2 Gillinov S et al. (2017) “Variable Accuracy of Wearable Heart Rate Monitors during Aerobic Exercise.” Medicine and Science in Sports and Exercise

※3 Tibana RA et al. (2019) “Perceived exertion is not correlated with heart rate in CrossFit competition.” Sports (Basel)