Beyond the calories

Heart rate monitoring was once exclusive to the world’s elite endurance athletes. Today, it lives on our wrists, intentionally or unintentionally. Most smartwatches and health wearables today can track, score, and summarize our bodies in real time with remarkable detail. This makes it easier to learn more about the human body in ways we could never have imagined before.

But even with greater access to data, many people still train in ways that ignore their body’s signals.

The various metrics: calories burned, average heart rate, VO2max score, and recovery reports are usually taken out of context and encourage unfavorable behavior. People push when their nervous system needs to be regulated, rest when their system is understimulated, and miss the most valuable insight heart rate monitoring provides.

Listening to your heart

Your heart rate is not just a fitness score or performance metric. It is a window into your nervous system. When used properly, it becomes one of the most effective tools for improving performance, enhancing fat loss, and restoring balance.

Scientifically, your heart rate is regulated by your autonomic nervous system. The balance between your stress/recovery or fight/flight response—or what is also known as the sympathetic and parasympathetic nervous systems.

This is why your heart rate responds not only to exercise but also to poor sleep, psychological/emotional stress, breathing patterns, caffeine, and dehydration. These also produce markedly different heart rate responses to two identical workouts, depending on the state of your nervous system.

Hence, understanding this shifts heart rate monitoring from a performance tool to a regulatory instrument.

Heart rate misconception #1: Training the nervous system in constant “red alert”

Many exercisers aim for elevated heart rates in every session. In the long run, this habit keeps the sympathetic nervous system chronically active, which leads to premature fatigue, poor sleep quality, irritability, and stunted progress.

Heart rate misconception #2: Confusing effectiveness with effort

It is not particularly efficient when the heart rate is consistently elevated during strength or controlled movements. This often means that you’re not breathing properly, and you have lost parasympathetic control, which impairs your ability to recover.

Heart rate misconception #3: Ignoring resting heart rate and recovery data

Elevated resting heart rate is often the first sign of nervous system overload. Yet people often dismiss this and proceed as planned. Consequently, performance improvements are unremarkable because the nervous system is fatigued and has not been given the opportunity to be properly trained or regulated.

High performance often requires the ability to shift gears, including the capacity to recover from stress effectively, as seen in elite athletes, who are well-documented to have deeply rooted nervous system adaptability.

Heart rate monitoring helps identify the appropriate intensity for a given training day and assess whether one’s recovery systems are keeping pace with the training load. In short, it helps determine whether high-intensity work is productive or destructive.

Knowing this, we can begin to see progress in training quality on several parameters:

• Easy days support parasympathetic nervous system activation (vagal tone)
• Hard days are intentional, brief, and recoverable
• Breathing is controlled under pressure/load
• Strength sessions are not measured like a cardiovascular stress test.

And for proper recovery to take place, one must stop assuming it’s just plain resting. Your body’s parasympathetic nervous system should dominate at this time in order for full restoration to take place.

What is a resting heart rate?

Your resting heart rate (RHR) is like considering you’re a car, with your heart as the engine, in an idle state. It’s ticking without the gas pedal pressed. It also means the fewest times your heart needs to beat in order to keep everything running while you’re completely at rest.

A lower RHR means that your heart has improved strength and doesn’t have to work as hard to pump blood to the whole body. Meanwhile, an elevated RHR often indicates accumulated and unresolved stress, even before physical signs are evident. It also indicates that your heart is working slightly harder than necessary at rest, compared with the previous measurement.

What is a heart rate recovery?

In simple terms, heart rate recovery (HRR) is the measurement of how quickly your heart slows down immediately after you stop exercising. It is a test of how quickly your body can transition from work to rest. Faster post-exercise heart rate declines often reflect greater nervous system flexibility and faster recovery. It also means that your heart is tuned up and is very efficient in turning off the adrenaline and returning to normal.

You can measure your HRR by checking the difference between the peak heart rate during workout and the heart rate exactly one minute after stopping.

Drop of 12bpm or less: sign of fatigue or low fitness

Drop of 13-17bpm: Below average

Drop of 18bpm-20: Good/healthy for active people

Drop of 25-30+: Excellent cooling system. Awesome sign of heart strength

Accordingly, aiming for your target HR is important if you want to promote a specific type of development in your body’s response. Moreover, you must consider improving the ability to downshift rapidly from strenuous effort to complete rest or recovery. That being so, heart rate monitoring plus RHR/HRR helps train this skill by encouraging several key activities:

• Identifying the correct type of activity on a given training day in relation to RHR/HRR
• Making modifications to exercise load when appropriate
• Controlled breathing between training sets
• Intentional rest periods
• Adding lower-intensity aerobic workouts to enhance the parasympathetic dominance
• Increased overall self-awareness in load selection and program modification

General breakdown of RHR:

Typical adult normal: 60-100 BPM (beats per minute)

Athletes: 40-60 BPM

High/Stressed: 100+ BPM

Pro tip: The best time to check is immediately after waking up, before you get out of bed, check social media, and have coffee.

Step 1 – Calculate max heart rate (MHR)

Tanaka Formula: MHR = 208 – (0.7 x age)

Example: 48 years old:

208-(0.7×48) = 174bpm (MHR)

Step 2 – Choose your intensity zone

Step 3 – Calculate Target HR (THR)

THR= MaxHeart Rate (MHR) x Intensity Zone

Example: 48 years old, 174bpm HRmax

Zone 2 (60-70%)

174 x 0.60 = 104

174 x 0.70 = 122

Target Zone 2 (Aerobic/Fatburn) : 104-122bpm

This story was originally published in Multisport 2026, issue 2