First, we calculate your HRV value using precise algorithms, which is a general and accurate data point. Then, we combine this with your gender, age, heart rate, and HRV baseline set in Apple Health to comprehensively assess your stress level.

No, as mentioned above, the stress level is calculated based on multiple factors. However, HRV is a significant health indicator (similar to heart rate and blood pressure) and has a strong correlation with stress levels, which is why we display HRV alongside the stress level.

Higher HRV values typically indicate better health and a younger biological age. However, HRV can be influenced by various factors, including your mindset, air quality, age, and exercise patterns. It's normal for your HRV to fluctuate slightly from day to day. There is no fixed "standard range," and each person's "range" can be different.

If your HRV values are very low over a short period, it may indicate that your physical condition is not optimal. You can improve your health by adjusting your lifestyle through exercise, mindfulness, and better sleep. However, if your HRV values remain low over a longer period, it's important to undergo necessary medical checks, as "HRV has a strong association with conditions such as acute myocardial infarction and diabetes".