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Health Glossary

Wearable health, decoded

Plain-language definitions for the metrics your watch, ring, and smart scale actually track. What each number means, how it is measured, and why it matters for your health.

24
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Most searched
Heart Rate Variability (HRV)
The variation between your heartbeats, and one of the most useful signals a wearable tracks. Why higher is usually better, and how to read your trend.

Biomarkers

3
Heart Rate Variability (HRV) What HRV is, why higher is usually better, and what your watch's number says about recovery and stress. Read → SpO2 (Blood Oxygen Saturation) What blood oxygen saturation measures, normal ranges of 95 to 100%, and why wearables track it overnight. Read → Cardiac Efficiency How cardiac efficiency reflects your heart's ability to deliver oxygen with minimal effort. Read →

Sleep

4
Sleep Stages (REM, Deep, Light) Light, deep, REM, and awake stages explained, and what each does for memory, recovery, and hormones. Read → Sleep Quality Score What your sleep quality score means, how it is built from stages, duration, and efficiency, and how to improve it. Read → Sleep Efficiency Time asleep versus time in bed, how to calculate it, and why 85% or more is considered good. Read → Sleep Hygiene Evidence-based habits that improve sleep: light exposure, temperature, caffeine timing, and screens. Read →

Fitness

3
Training Load What training load measures, the acute-to-chronic workload ratio, and how to avoid overtraining. Read → Zone 2 Training Why Zone 2 (60 to 70% of max heart rate) is the foundation of endurance fitness and longevity. Read → Active Recovery What active recovery is, why it speeds muscle repair better than full rest, and how to do it right. Read →

Body & Metabolism

5
Biological Age The wear-and-tear age of your body, not the calendar one. What wearables measure to estimate it and how to lower yours. Read → Basal Metabolic Rate (BMR) What basal metabolic rate is, how it is calculated, and why it matters for weight and nutrition. Read → TDEE (Total Daily Energy Expenditure) What total daily energy expenditure is, how it differs from BMR, and how to use it for your goals. Read → BMI (Body Mass Index) What BMI is, how it is calculated, and why body composition matters more, especially for athletes. Read → Visceral Fat What visceral fat is, why it is linked to heart disease and diabetes, and how to reduce it. Read →

Wearable Metrics

2
Body Battery What Garmin Body Battery measures and how it blends HRV, stress, activity, and sleep into one energy score. Read → Stress Score How wearables measure stress via HRV-based autonomic balance, and what the numbers mean. Read →

Science

3
Autonomic Nervous System (ANS) How the autonomic nervous system controls heart rate, stress response, and recovery, and why balance matters. Read → RMSSD (HRV Metric) The gold-standard HRV metric. What it measures, normal ranges by age, and how it reflects recovery. Read → Bioimpedance Analysis (BIA) How smart scales use a small electrical current (BIA) to estimate body fat, muscle, and hydration. Read →

Wellness

1
Readiness Score What a readiness score tells you about your body's preparedness for the day, based on sleep, HRV, and recovery. Read →

MyBodyAI Scores

2
Body Status Score How MyBodyAI combines 12 health indices into a single body status with five levels. Read → Strain Score How MyBodyAI calculates daily strain from heart rate, activity intensity, duration, and physiological stress. Read →

AI

1
Health Pattern Detection How wearable data and AI spot unusual health patterns days before symptoms, from HRV, heart rate, and sleep. Read →

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