What Is the Difference Between HR and RHR? Understanding Heart Rate and Resting Heart Rate

If you use a Smart Band, Smartwatch, or Fitness Tracker, you may have seen the terms HR and RHR in the companion app. But what is the difference between HR and RHR, and what can these two metrics tell you about your body?

In simple terms, HR (Heart Rate) refers to the rate at which your heart is beating at a particular point in time, while RHR (Resting Heart Rate) refers specifically to your heart rate while your body is at rest. RHR is therefore a specific type of heart rate measurement, while HR can be measured during many different activities and situations.

Understanding the difference between HR and RHR can help you make better use of the health and fitness data provided by a Smart Band or Fitness Tracker.

What Is HR?

HR, or Heart Rate, is the number of times your heart beats per minute. It is commonly expressed as BPM (Beats Per Minute).

Heart rate can change throughout the day depending on what you are doing and how your body is responding. For example, your heart rate may be lower while sitting quietly and increase when you walk, run, or perform more intense exercise.

When a Smart Band displays your HR in real time, the number represents an estimate of your heart rate at that particular moment or during the selected measurement period. It is not necessarily a fixed number that remains the same throughout the day.

Examples of Situations Where HR Can Change

• While sitting or resting
• While walking
• During exercise
• Immediately after exercise
• During periods of recovery
• During sleep

For this reason, HR can be useful for monitoring how your heart rate changes in response to different activities throughout everyday life.

What Is RHR?

RHR, or Resting Heart Rate, refers to your heart rate while your body is at rest. Unlike general HR measurements, RHR specifically focuses on periods when the body is not performing strenuous physical activity.

RHR can therefore provide a useful baseline for observing your personal heart rate trends over time.

Resting Heart Rate can be influenced by many factors, including physical activity, stress, sleep, caffeine, illness, and other individual circumstances. This is why looking at your RHR trend over time can often provide more context than focusing on a single measurement.

What Is the Difference Between HR and RHR?

HR and RHR Explained in Simple Terms

A simple way to understand the difference is to compare heart rate with a car engine.

HR is like checking the engine speed while the car is being used. The number can increase or decrease depending on what the car is doing.

RHR is more like checking the engine's idle speed while the car is stationary. It focuses on the system while it is in a resting state.

In other words, RHR can be considered a specific form of HR measurement, but with an important condition: the measurement is taken while the body is at rest.

Why Should You Track RHR?

One reason Smart Bands and Fitness Trackers monitor RHR is that it can provide baseline information for observing personal trends over time.

Instead of asking only, "What is my heart rate today?", users can track RHR over multiple days or weeks and observe how their own resting heart rate changes.

For people who exercise regularly, RHR can be considered alongside other information such as sleep, HRV, activity levels, training load, and how they feel each day.

However, RHR should not be used by itself to determine whether someone is healthy or fit because resting heart rate can be affected by many different factors.

How Is RHR Related to Exercise?

People who exercise regularly may be interested in RHR because it is one of several metrics that can be used to monitor personal trends.

For example, users can track RHR over time and compare the information with their sleep, exercise sessions, daily activity, and how they feel physically.

However, a single RHR measurement should not be used to determine fitness level or conclude that something is wrong with the body. RHR naturally varies and can be affected by many factors.

Why Is HR Important During Exercise?

During exercise, HR can help users observe how their heart responds to physical activity. As exercise intensity increases, the body's demand for oxygen and energy generally increases, which can cause heart rate to rise.

This is why Smart Bands and Fitness Trackers commonly use HR as one of the key metrics for monitoring workouts such as walking, running, cycling, and other physical activities.

How Do Smart Bands Measure HR and RHR?

Many Smart Bands and Smartwatches use optical sensors positioned against the skin around the wrist. This technology is commonly known as PPG (Photoplethysmography).

PPG sensors detect changes in blood volume near the skin that are associated with heart activity. The device then processes the sensor data using software and algorithms to estimate heart rate.

For HR, the device can provide heart rate measurements during different activities or periods of the day. For RHR, the system focuses on data collected while the body is considered to be at rest and uses that information to estimate resting heart rate trends.

Why Should Smart Bands Track HR and RHR Continuously?

One of the main advantages of a Smart Band is its ability to collect health and activity data over extended periods. Instead of relying on a single measurement, users can review trends across days and weeks.

• HR helps monitor changes in heart rate during activities.
• RHR helps monitor resting heart rate trends.
• Historical data can make personal patterns easier to identify.
• Heart rate data can be considered alongside sleep and exercise information.

Should You Look at HR or RHR?

The answer depends on what you want to monitor.

If you want to understand how your heart responds while walking, running, or exercising, HR is more relevant because it can show changes during physical activity.

If you want to monitor your heart rate while your body is resting, RHR is the more appropriate metric.

For long-term health and fitness tracking, looking at both HR and RHR can provide different perspectives. These metrics can also be considered alongside other information such as HRV, sleep, and daily activity.

How Are HR and RHR Different From HRV?

Another term commonly found in Smart Band apps is HRV (Heart Rate Variability), which is different from both HR and RHR.

• HR = Heart Rate
• RHR = Resting Heart Rate
• HRV = Heart Rate Variability

HR and RHR focus on the rate of heartbeats, while HRV focuses on the variation in the time intervals between heartbeats.

Understanding all three metrics can provide a broader perspective when using a Smart Band or Fitness Tracker to monitor health and fitness trends.

What Should You Know About Smart Band Heart Rate Data?

HR and RHR data from Smart Bands can be useful for monitoring health and activity trends in everyday life, but they should not replace professional medical examination or diagnosis.

Measurement accuracy can be affected by several factors, including body movement, device position, strap tightness, activity type, and individual skin characteristics.

For this reason, Smart Band data is best viewed as trend information rather than using a single measurement to make conclusions about your health.

If you experience unusual symptoms or have concerns about your health, consult a qualified healthcare professional rather than relying solely on Smart Band measurements.

HR vs RHR: Quick Summary

HR (Heart Rate) is the rate at which your heart beats at a particular point in time. It can change depending on activities such as resting, walking, running, or exercising.

RHR (Resting Heart Rate) is the heart rate measured while your body is at rest. It can be useful for monitoring personal resting heart rate trends over time.

In the simplest terms, HR is your general heart rate, while RHR is your heart rate specifically while you are at rest.

When using a Smart Band or Fitness Tracker, monitoring both HR and RHR over time can provide useful information about daily activity and personal trends. For a broader picture, these metrics can be considered alongside sleep, exercise, activity levels, and how you feel each day.