Here's What You Need to Know About Your Running Heart Rate

Using heart rate as a training tool for running is a common practice among runners of all levels and distances. Like many aspects of health and fitness, heart rate zones and their application in training will vary between people. We dive into everything you need to know about running heart rate. 

» Check out Dr. Rachel Pojenic's podcast on the effects of exercise on healthspan

Factors that influence average heart rate while running 

During exercise, like running, the body’s demand for oxygen increases. To meet this demand, the heart rate increases to allow for increased circulation of blood around the body. The harder someone works during exercise, like by increasing pace or weight, the higher heart rate will go. [1]

Much like resting heart rate (RHR), there are a number of factors that can influence average heart rate while running. These include many of the same factors that impact RHR, such as:

• Age
• Sleep
• Hydration status
• Environment
• Physical activity level

» Want optimal heart health? Discover what a healthy resting heart rate is

1. Heat and humidity on running heart rate

During hot and humid weather, the heart works hard to help keep the body cool. This extra load leads to an increase in heart rate earlier into a run than would occur on a cooler day. Hot and humid conditions will increase stress on the cardiovascular system, which manifests as a number of physiological changes, including an increase in heart rate.

2. Caffeine intake on running heart rate

While it’s known that caffeine can be used for a performance boost, it can also lead to an elevated heart rate, especially when taken in high doses. [3, 4] It's recommended that, if you would like to explore using caffeine as a tool before or during your races, you test out its effects during training, as caffeine tolerance during exercise varies between individuals.

3. Stress levels on running heart rate

Stress and stressful events can take a toll on your body—both physically and mentally. Chronic stress (manifested as elevated cortisol levels in the blood) is linked to a number of negative health outcomes, and acute stress can affect heart health, including heart rate.

According to an article published in JAMA, an increase in both emotional and physical stress can lead to a number of physiological changes, including an elevated heart rate. [6]

Finding your ideal running heart rate

Calculating maximum heart rate

Ideal running heart rate can be calculated in a number of ways. The most accurate ways are by undergoing a VO2max test or by doing a max heart rate (MHR) test. If you’re unsure of what your MHR is, there are a number of formulas to calculate estimated MHR using age-predictive equations.

The most common of these include the Gulati formula and Tanaka formula (though the Fox formula is also common). Here's how to calculate MHR with these formulas in an example 33-year-old athlete:

• Tanaka formula: 208 - 0.7 x age l 208 - 0.7 x 33= 185 bpm
• Gulati formula: 206 - 0.88 x age l 206 - 0.88 x 33= 177 bpm

Estimating maximum heart rate after 5-10km run

Heart rate tracking data measured during max or all-out efforts can also be used to estimate MHR in lieu of an MHR test. For example, measurements might be from the end of a 5 or 10-km race and will ideally be taken with a chest heart rate strap for the most accurate reading. [8, 9, 10]

» Want to understand your HRV? Learn what a good heart rate variability is



Calculating heart rate zones for training and running

An accurately calculated MHR is an important first step to calculating suggested heart rate zones. [11]

Training that is structured to heart rate zones can help runners improve performance and aid in injury prevention by avoiding under- or overexertion. Such a structure also improves recovery between training sessions and helps to prevent overtraining syndrome. 

Getting in the running heart rate zone

Below are general running heart rate zone guidelines, though some running coaches may use slightly different percentages for their athletes to provide an individualized approach to running heart rate zones. [12] 

• Zone 1: 50-60% MHR 
• Zone 2: 60-70% MHR
• Zone 3: 70-80% MHR
• Zone 4: 80-90% MHR
• Zone 5: 90-95% MHR

» See how zone 2 heart rate training can enhance endurance and promote longevity

Creating heart rate zone-based running training plans

Running training plans should include a variety of different types of runs based on these heart rate zones. This includes long runs such as marathons, tempo runs, and interval runs for speed work.

General recommendations suggest that 80% of runs should be at low or easy intensity (zones 1-3) and 20% of runs should be hard or high intensity (zones 4 & 5). [13] 

This distribution will vary between runners depending on their fitness level, goals, and phases of the training cycle. Each zone has a different purpose in training—lower zones build aerobic capacity and higher zones target lactate threshold. [14] 

What happens if you run with a high heart rate?

Frequently running with a high heart rate can lead to negative outcomes, including chest pain, arrhythmias (irregular heartbeat), delayed recovery, and overtraining. This often leads to injuries, burnout, or plateaus in performance. It is critical to pick and follow a training plan that is not only targeted to your goals but also safe and suits your fitness level. 

You can check your body's recovery by monitoring your RHR daily—RHR will increase with overtraining and poor recovery. [15] RHR can also increase as an early sign of illness due to dehydration, during periods of stress, or as a result of poor sleep.

 Can your heart rate be too low when you run?

It is not uncommon for runners to have a lower heart rate than their less active counterparts, and it is normal for RHR to decrease as aerobic endurance increases. Runners and other endurance athletes tend to have an RHR between 40 and 60 bpm, but could also be as low as 30 bpm.

» Cardio vs. strength training: Find out if you really need to do both

How to optimize your running heart rate

Attention to heart rate during runs can be a helpful tool to dial in your training. Here are a few ways to optimize your running heart rate:

• Slow down or reduce the intensity of your run. If you’re new to running, returning to running after some time off, or training for a longer distance, using a run-walk approach can help to keep your heart rate normalized as the body adapts to the new workload.
• Stay hydrated. Dehydration can elevate your heart rate by putting additional stress on the heart. Showing up ready to run hydrated is key to managing your running heart rate.
• Be consistent. Regular aerobic exercise like running, walking, and swimming will reduce heart rate over time as the heart becomes stronger and more efficient. 

Connecting to InsideTracker

InsideTracker syncs with wearable fitness trackers like Garmin smartwatches, FitBits, and soon Apple Health and is able to automatically pull heart rate and activity data like runs.

From this data, InsideTracker populates ProTips—nuggets of laser-focused recommendations developed by scientists and registered dietitians, to provide real-time feedback.

You can sync your wearable to InsideTracker’s mobile app, no matter which plan you purchase. The Ultimate Plan and the Shalane Flanagan Panel measure the relevant biomarkers for the InsideTracker Endurance goal to guide your Action Plan.

This personalized checklist prioritizes recommendations based on your blood, fitness tracking, and DNA data to guide you toward your goal. 

Selecting the endurance goal will prioritize recommendations that will help you sustain cardiovascular and muscular performance over longer periods, including resting heart rate.

References:

[1] https://www.ahajournals.org/doi/10.1161/circresaha.117.305205

[2] https://pubmed.ncbi.nlm.nih.gov/28985128/

[3] https://pubmed.ncbi.nlm.nih.gov/29075019/

[4] https://pubmed.ncbi.nlm.nih.gov/28527645/

[5] https://jissn.biomedcentral.com/articles/10.1186/s12970-020-00383-4

[6] https://jamanetwork.com/journals/jama/fullarticle/208031

[7] https://pubmed.ncbi.nlm.nih.gov/25761214/

[8] https://pubmed.ncbi.nlm.nih.gov/33042384/

[9] https://pubmed.ncbi.nlm.nih.gov/21456366/

[10] https://pubmed.ncbi.nlm.nih.gov/29599724/

[11] https://www.acsm.org/education-resources/trending-topics-resources/physical-activity-guidelines

[12] https://journals.lww.com/acsmhealthfitness/fulltext/2019/05000/revisiting_heart_rate_target_zones_through_the.8.aspx#JCL-P-5

[13] https://pubmed.ncbi.nlm.nih.gov/20861519/

[14] https://pubmed.ncbi.nlm.nih.gov/23752040/

[15] https://pubmed.ncbi.nlm.nih.gov/23195630/