Heart rate or cadence: which do you use to guide your training?

Heart rate and cadence are two metrics every serious cyclist or runner knows, but which are frequently confused. They seem to point to the same goal—providing insight into your effort—but they measure something fundamentally different. Understanding the distinction allows you to guide your training much more effectively.

What does heart rate tell you about your training?

Your heart rate is a direct reflection of what's happening in your body. Your heart pumps harder as your muscles demand more oxygen. This makes heart rate a reliable measure of your physiological load: how hard is your body working right now?

When you train by heart rate, you train in intensity zones. In Zone 2, you build your aerobic base, while higher zones develop your thresholds and speed. The disadvantage is that heart rate reacts slowly. After a sudden acceleration, it takes twenty to thirty seconds for your heart rate to reflect the actual effort. Factors such as heat, fatigue, or caffeine also affect your heart rate without you actually training harder.

An accurate heart rate sensor is essential if you train by zones. Coospo offers chest straps and optical sensors that measure continuously and reliably, even during intense intervals.

What does cadence tell you about your technique and efficiency?

Cadence, the number of revolutions per minute, tells a completely different story. It's not a measure of how hard you work, but of how you work. A high cadence at low resistance trains your neuromuscular system and saves muscle strength for longer durations. A low cadence at high resistance puts more pressure on your muscle strength and increases the risk of overuse injuries to knees and joints.

For cyclists, a rule of thumb is that a cadence between 85 and 95 revolutions per minute is more efficient for most riders than pedaling below 70. But that's not a strict rule. Workouts where you consciously vary your cadence help your body become more flexible and stronger on the bike.

Cadence reacts instantly. If you pedal harder, you'll see it immediately in the measurement. This makes it ideal for technique training where you want to consciously control your pedal stroke. Check out Coospo's range of speed and cadence sensors for compact and affordable options that are easy to fit on your bike.

When do you use which measurement?

The two measurements complement each other, and you don't have to choose. In practice, you use both, but for different purposes.

• Endurance training and recovery rides: focus on heart rate to stay within your zones
• Technique training and cadence blocks: use cadence as direct feedback
• Intervals: combine both; heart rate shows your recovery between blocks, cadence shows your execution during blocks
• Hot days or after a poor night's sleep: rely more on cadence than heart rate, as the latter is less reliable with external factors
• Long climbs: cadence helps you maintain pace before your heart rate gets too high

Two sensors, one complete training picture

Many recreational cyclists start with a cadence sensor because it provides immediate and intuitive feedback. Those who want to grow further add a heart rate sensor to also understand the physiological side of training. Together, they provide a complete picture: you not only see what you're doing, but also how your body is reacting.

Coospo makes it accessible to use both measurements affordably, without sacrificing accuracy. Whether you're just starting to train with data or want to refine your training approach, the right sensor helps you understand every ride better.