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Understanding Heart Rate Training for Hyrox: Benefits, Limitations, and Strategies


Understanding heart rate for HYROX

For HYROX athletes, finding the perfect balance between strength and endurance training can be challenging. One crucial aspect of achieving peak performance is understanding and effectively utilising heart rate training zones. By monitoring your heart rate during exercise, you can optimise your workouts, prevent overtraining, and ensure you're making progress towards your unique fitness goals. In this blog post, we will explore the benefits of heart rate training specifically for HYROX athletes, some of the limitations, how to determine your heart rate training zones, and practical tips for integrating this powerful tool into your HYROX training plan.


What is heart rate training and how does it work?


Heart rate training is a method of monitoring and adjusting your workouts based on your heart rate during exercise. It helps you understand your body's response to different levels of exertion and tailor your training to match your unique fitness goals. By using heart rate zones, you can ensure that you're working at the appropriate intensity for each workout, which is particularly important for HYROX athletes who need to balance strength and endurance training effectively.


Why should I use heart rate training?

  1. Optimised VO2Max Training: Targeting sessions at 95% of maximum heart rate enables HYROX athletes to effectively enhance their VO2Max. Short, intense intervals within this heart rate zone are crucial for boosting aerobic capacity, essential for the high-energy demands of HYROX.

  2. Effective Threshold Work: Utilising heart rate monitoring to train at lactate threshold intensity is vital for HYROX. It improves the body’s ability to tolerate and clear lactate, which is essential during prolonged high-intensity activities like sled pushes or burpees.

  3. Building a Strong Aerobic Base: Training below the first lactate threshold (LT1) is key to developing endurance. This involves longer, lower-intensity sessions where the heart rate remains in a lower zone, forming the foundation for sustained performance.

  4. Tailored Training Intensities: Heart rate data allows HYROX competitors to customise their training. Using heart rate zones for easy recovery runs ensures proper recovery, while higher zones on interval days align efforts with training goals.

  5. Preventing Overtraining: Regular heart rate monitoring during different training phases helps HYROX athletes avoid overtraining. By ensuring high-intensity days are truly challenging and rest days are used for recovery, it maintains a balanced training regime.Limitations of Heart Rate Training

Despite these advantages, heart rate training also has its limitations.


Limitations of Heart Rate Training

  1. Estimation Errors: The traditional calculation of heart rate zones often relies on generalised formulas, which might not accurately reflect an individual's unique physiological response to exercise.

  2. Physiological Variability: Heart rate can be influenced by a variety of factors like stress, sleep quality, and hydration levels, leading to fluctuations that may not accurately represent workout intensity.

  3. Lag in Response: Heart rate can sometimes lag behind sudden changes in exercise intensity, especially in high-intensity or complex movements, potentially misrepresenting the actual effort exerted.

  4. Over-reliance on Data: Excessive focus on heart rate metrics might lead athletes to ignore other important indicators of performance and well-being, such as perceived exertion or muscle fatigue.

  5. Threshold Misinterpretation: While heart rate training aims to optimise training zones, inaccuracies in determining the precise lactate threshold can lead to suboptimal training intensities.


Enhancing Heart Rate Training with Pace and RPE

For HYROX athletes, heart rate training becomes even more effective when combined with pace and Rate of Perceived Exertion (RPE). These additional metrics provide a well-rounded approach to training, allowing for more precise adjustments and a better understanding of your body's responses.


Using Pace to Complement Heart Rate

Pace, or the speed at which you complete your runs or exercises, is a tangible measure of performance. It can be particularly useful in steady-state or long-duration workouts where maintaining a consistent speed is crucial.

  • Balancing Heart Rate and Pace: For example, if your heart rate is lower than expected at a certain pace, it might indicate improved fitness, suggesting a potential increase in training intensity. Conversely, a higher heart rate at a usual pace could signal fatigue or overtraining.

  • Pace in Interval Training: During interval training, pace helps ensure you're hitting the desired intensity. If your heart rate isn’t reaching the targeted zone quickly enough, an increase in pace might be necessary.

Rate of Perceived Exertion (RPE) for Subjective Feedback

RPE is a subjective measure of how hard you feel you’re working. It ranges typically from 1 (very easy) to 10 (maximum effort) and offers valuable insight into your exertion level, independent of heart rate or pace. This can be particularly good for the functional exercises (burpees, wall balls etc) where it's difficult to rely on heart rate as a gauge.

  • Combining RPE with Heart Rate Data: RPE can be especially helpful in understanding your body's response to training. For instance, if a session feels harder than usual (higher RPE) but your heart rate data shows you're within your normal training zone, it might indicate external factors like stress or inadequate recovery impacting your performance.

  • Adapting Training with RPE: Use RPE to adjust your training in real-time. If a workout feels excessively hard (high RPE) despite being in the right heart rate zone, it might be wise to reduce the intensity to prevent overexertion.

Integrating Pace and RPE for Holistic Training

By integrating pace and RPE with heart rate data, HYROX athletes can achieve a more comprehensive view of their training. This triad of metrics allows for better regulation of workout intensity, ensuring that each training session is optimised for both immediate performance and long-term progress.





Incorporating pace and RPE into heart rate training not only provides a more complete picture of your workout but also empowers you to make informed decisions about your training, leading to more effective and enjoyable HYROX sessions.


How to calculate running heart rate zones



Understanding how to calculate your heart rate training zones is crucial for effective heart rate-based training. There are several methods and tools available for this purpose:


VO2Max and Lactate Testing: For the most accurate results, a professional assessment, such as a lactate threshold test or a VO2 max test in a controlled environment, can be invaluable. These tests directly measure how your body responds to different levels of exercise intensity.


Using Technology-Aided Calculations

Many athletes turn to technology for convenience and efficiency. Popular fitness apps and devices like Polar, MyZone, and Garmin offer built-in features to calculate your heart rate zones. These tools typically use algorithms based on your age, fitness level, resting heart rate, and maximum heart rate to estimate your training zones.


Caution with Inaccuracies

While these technological aids are user-friendly and accessible, it's important to be mindful of potential inaccuracies. These systems often rely on generalized formulas that may not account for individual variations in physiology and fitness. For instance, a generic calculation based on age might not accurately reflect your personal fitness level or cardiovascular capacity.


Alternative Methods - The Field Tests

To complement technology-based estimates, consider other methods such as:

  1. The 30mins Threshold Time Trial - For this test, warm up for 10-15mins then, run as fast as you can for 30mins whilst trying to maintain an even effort. You can then look at your average pace and heart rate for the last 20mins of the test. This will equate roughly to your threshold value.

  2. The Max Heart Rate Test

Warm up for 10-15 minutes. Run up a hill for at least 2 minutes at a pace you think you could hold for 20 minutes. Jog to the bottom of the hill and repeat the hill again but at a slightly faster pace. Repeat this a third time and increase the speed again so you can only just complete the 2 minutes. Record your maximum heart rate.

  1. The other option is to run 1 mile and every 1/4 of a mile increase the pace until you're running all out for the final 1/4. The highest number observed is the max heart rate.)

Once you have your threshold and maximum heart rate, you can calculate your training zones like in the image below. (Multiplying your threshold value the corresponding % in the second table. For example for the top of zone 1, multiply your threshold heart rate by 0.85).


Lactate Threshold and VO2 Max Testing: Precision in Heart Rate Training

For athletes looking to refine their heart rate training with precision, lactate threshold and VO2 max testing offer the most accurate insights into their physiological response to exercise.


Lactate Threshold Testing

Lactate threshold testing is a highly specific method to determine the exact point at which your body starts to accumulate lactate faster than it can be cleared. This threshold is crucial for endurance athletes as it marks the highest intensity at which they can exercise for an extended period without fatigue.

  • How It Works: The test involves incremental exercise bouts or a steady-state exercise where lactate levels in the blood are measured at different intensities.

  • Benefits: Identifying your lactate threshold provides a precise heart rate marker for designing training sessions. Training just below the lactate threshold can enhance endurance, while training just above can improve lactate clearance and high-intensity performance.

  • Application in Training: By knowing your lactate threshold, you can tailor your heart rate zones more accurately, ensuring each training session is optimised for maximum efficiency and effectiveness.

VO2 Max Testing

VO2 max, or maximal oxygen uptake, is the greatest amount of oxygen your body can use during intense exercise. It's a cornerstone metric for assessing cardiovascular fitness and endurance capacity.

  • How It Works: This test typically requires exercising at increasing intensities under controlled conditions, often on a treadmill or a stationary bike, while breathing into a mask that measures oxygen consumption.

  • Benefits: VO2 max testing gives you a definitive measure of your aerobic fitness. Training to improve VO2 max can lead to significant gains in endurance and overall performance.

  • Application in Training: Knowing your VO2 max can help set realistic training and competition goals and allow for the precise calibration of heart rate zones, particularly for aerobic endurance training.

Integrating Testing into Training Plans

Incorporating the results from lactate threshold and VO2 max testing into your training plan can lead to remarkable improvements. These tests offer a factual basis to calibrate training intensity, monitor progress, and adjust training regimens as fitness levels evolve.


Unlock your true athletic potential with our precision lactate threshold and VO2 max testing. These tests are your gateway to personalised heart rate zones, optimised training plans, and unparalleled performance insights. Book your test now and embark on a journey to peak performance with science-backed precision.




Your Heart Rate Training Zones and what they mean


There are a number of ways to split up your heart rate training zones, however I like to use a 6 zone model.




Zone 1 – Recovery Zone (50-60% of max heart rate - MHR)

Zone 1 is your recovery zone, which is used to help flush out waste products built up after a hard workout. During hard intense sessions you produce hydrogen ions that impact muscle contraction and affect performance. A low intensity recovery session at zone 1 will help flood the body with oxygen to help remove these hydrogen ions. Keep these below 60mins. Use these after hard sessions.


Zone 2 – Endurance Zone – Building your aerobic engine (60-70%MHR)

Just above your recovery zone and around your lactate threshold 1 is your endurance zone, which is used to help build your aerobic base. This is the intensity where you build the foundations of endurance performance and where most of your running miles are performed.

Zone 3 - High Aerobic Zone (tempo - 70-80%MHR)

The high aerobic zone is just above your aerobic threshold. Training here will see similar benefits of training in zone 2, however you’re also subjecting your body to more stress, which can impede subsequent more important sessions in the week (VO2Max and Threshold work). If the race you are training for lies within this zone (½ marathon/marathon) then you still need to spend some time here to understand your race pace.

Zone 4 - Threshold Zone (80-90%MHR)

Zone 4 skirts around your second Lactate Threshold (LT2). At this point you become better at withstanding lactic acid and removing it, and you are able to increase your anaerobic threshold closer to your VO2 max. This means you can race harder for longer. Training in Zone 4 can lead to significant performance gains but should be balanced with adequate recovery.

Zone 5 - VO₂ Max Zone (90-100%MHR)

Your VO2 max zone is the intensity from around 95-100% of your VO2Max or Maximum Heart Rate (MHR). Similar to the endurance zone, this zones also increases your VO2 max. Training in Zone 5 can lead to increased VO2 max and overall performance gains, but it also carries a higher risk of overtraining and should be used sparingly.

Zone 6 - Your Anaerobic Zone

Your anaerobic zone is the high-intensity zone used to flood the body with lactic acid, recovering a little but not fully and repeating the process. This teaches the body to get better at tolerating and clearing lactic acid out of the system.


Similar to the threshold zone, training at these intensities will help you improve your anaerobic threshold and how much of your VO2 max you can actually use.


When you start running faster, your heart rate won't rise immediately and won't initially reflect the intensity that you're running at. This is why at this zone, you're better at using pace or perceived effort as a measure of intensity, which is why we don't include it in our heart rate training zone calculator.


To gain the most benefit from heart rate training is to individualise your zones using metabolic testing. This enables you to build a training plan based on your physiology and individual needs.


What next?


In conclusion, heart rate training is great and often underutilised tool for HYROX athletes looking to optimise their programme and achieve their goals. By understanding the basics of heart rate training and how it works, athletes can harness the benefits of this method to improve both their endurance and strength.


Take your HYROX Performance to the Next Level


Elevate your HYROX training with our specialised services. Whether you're seeking comprehensive HYROX training plans, tailored guidance, or a combination of precise lactate threshold and VO2 max testing with a customised training plan, we have you covered. Take the first step towards your peak performance by booking with us today. Discover a training journey designed specifically for you, where every step is backed by scientific insight and personalized attention. Let's achieve greatness together!




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