Low SpO2 at Night: Common Causes, Measurement Errors, and When to Seek Care
Seeing a low SpO2 reading during sleep can be unsettling, especially when the number appears suddenly or is lower than your usual overnight pattern. But one low wearable reading does not automatica...
How to Take Basal Body Temperature Correctly for Cycle Tracking
Basal body temperature, commonly shortened to BBT, is your body temperature when you are fully at rest. When measured consistently across a menstrual cycle, a small sustained temperature shift can ...
Why Does Body Temperature Change Throughout the Day? Morning vs Evening Patterns
Your body temperature is not supposed to stay at exactly the same number from morning to night. It follows a daily rhythm, usually reaching lower levels in the early morning and rising as the day p...
Health and Fitness Apps: What Data Should You Sync From a Wearable?
Connecting a wearable to a health or fitness app can make your data easier to use, but syncing every available metric is not always the best setup. The more apps you connect, the easier it becomes ...
What Is Cardiovascular Capacity? How It Relates to VO2 Max and Endurance
Cardiovascular capacity describes how effectively your body can support sustained physical activity by delivering oxygen to working muscles and using that oxygen to produce energy. In everyday fitn...
Breathing Techniques for Sleep: Which Methods Help You Wind Down?
If your body feels tired but your mind still feels switched on at bedtime, slowing your breathing can give you something simple and structured to focus on. Breathing exercises may help reduce stres...
At-Home Sleep Apnea Test: What It Measures and When It Is Used
If you snore loudly, wake up gasping, feel unusually sleepy during the day, or have been told that your breathing stops during sleep, a healthcare professional may recommend testing for obstructive...
Why Does Your Heart Rate Spike During Sleep? Common Causes and Red Flags
If you check your overnight heart-rate graph and see a sudden spike, it can look alarming. But a brief rise during sleep does not automatically mean something is wrong. Your heart rate naturally ch...
How to Lower Your Heart Rate Safely: Rest, Breathing, and When to Seek Care
If your heart rate suddenly looks higher than usual, the safest response depends on why it is elevated. A fast heart rate after exercise is different from a fast heart rate while sitting quietly, a...