You can determine if your estimated MHR is correct by comparing Myzone effort zones to your rate of perceived exertion (RPE) during cardiorespiratory exercise. That last part – “during cardiorespiratory exercise” – is important, because RPE doesn’t always match up with exercise intensity during muscular fitness or resistance training.
Rate of perceived exertion uses a scale of 1-10 (1 = lightest intensity, 10 = maximal intensity). For example, you should feel like you’re at about a 6 on the RPE scale when you’re exercising in the BLUE zone (60-69% of estimated MHR), and you should feel like you’re at about a 9 or 10 on the RPE scale when you’re in the RED zone (90%+ of estimated MHR).
If you’re a new Myzone user, pay attention to your Myzone effort zones and your RPE during your first few cardiorespiratory workouts. Do they align closely? Is there an obvious discrepancy?