Self-Checking for Sleep Apnea with Vital Ring®

Sleep apnea is a disorder in which breathing repeatedly stops or becomes irregular during sleep. It is estimated that around 1 billion adults worldwide experience this condition. Obstructive sleep apnea (OSA) is the most common type, occurring when the upper airway becomes partially or completely blocked during sleep. Central sleep apnea (CSA) occurs when the brain fails to send proper signals to the muscles responsible for breathing. In some cases, both types can occur simultaneously.

If left untreated, sleep apnea can lead to severe complications such as heart disease, diabetes, high blood pressure, and depression. It is crucial to recognize symptoms early and take appropriate action.


Common symptoms of sleep apnea include:

  • Loud snoring and gasping sounds
  • Frequent awakenings during the night
  • Waking up with a dry mouth
  • Excessive daytime fatigue
  • Morning headaches
  • Irritability and difficulty concentrating
  • Persistent fatigue due to poor quality sleep

If you experience these symptoms, consider undergoing a professional evaluation for sleep apnea.


ZTACom’s Vital Ring is a wearable device equipped with advanced biosignal sensors that track various health metrics. Vital Ring can assist in self-checking for sleep apnea by measuring the following data during sleep:

1. Blood Oxygen Level Tracking

  • Normal Range: Healthy blood oxygen levels are typically 95–100%.
  • Sign of Apnea: Repeated drops in oxygen levels below 90% during sleep may indicate sleep apnea.
  • Vital Ring’s Role: Vital Ring continuously measures blood oxygen levels during sleep to detect patterns of oxygen deficiency. Changes in oxygen levels are displayed as graphs in the app, allowing you to check for abnormalities.

2. Breathing Regularity Measurement

  • Normal Breathing Pattern: A consistent breathing cycle should be maintained during sleep.
  • Sign of Apnea: Irregular breathing or pauses in breathing may suggest sleep apnea.
  • Vital Ring’s Role: Vital Ring analyzes respiratory rates to detect abnormal breathing patterns. Alerts are sent via the app if breathing stops or extreme changes are detected.

3. Sleep Quality Evaluation

  • Normal Sleep Stages: Deep sleep and REM sleep are essential for recovery and regeneration.
    Normal Sleep Stage Pattern Ratio
    😴 Awake (5-20%): A short period of wakefulness to help prepare for the next day.
    🧠 REM Sleep (15-25%): The dreaming stage, important for learning and memory.
    💤 Light Sleep (40-60%): The main recovery phase where the body recharges energy.
    😌 Deep Sleep (12-23%): The phase for growth and repairing the body, helping with fatigue recovery.
  • Sign of Apnea: Sleep apnea can result in insufficient deep sleep or frequent awakenings, significantly lowering sleep quality.
  • Vital Ring’s Role: Vital Ring analyzes sleep stages and reports on waking time and deep sleep deficiency. Overall sleep quality can be assessed through a sleep score.

1. App Setup and Data Review

  • Wear Vital Ring and check blood oxygen levels, breathing regularity, and sleep stage data in the app.
  • If you experience daytime fatigue or difficulty concentrating, examine the app data for any abnormalities.

2. Blood Oxygen Level Analysis

  • Check if oxygen levels drop below 90% for extended periods during sleep.
  • Repeated occurrences of low oxygen levels at specific times may indicate apnea.

3. Breathing Pattern Observation

  • Review respiratory rate data for irregularities.
  • Use the app’s respiratory graph to identify patterns that differ from normal.

4. Sleep Score and Awakening Time Review

  • Assess the sleep score provided in the app. Focus on cases where “deep sleep time” is significantly lower than average.
  • If awakening time is excessively long, it may be related to sleep apnea.

Vital Ring provides intuitive visual graphs of measured data during sleep, aiding users in understanding their health status. Key graphs and their applications include:

1. Heart Rate (HR) Graph

  • Changes in heart rate during sleep reflect sleep stages and stress levels.
  • Abrupt or irregular spikes in heart rate may indicate apnea.

2. Breath (Respiratory) Rate Graph

  • Inconsistent breathing or significant decreases in respiratory rate suggest possible apnea.
  • Identify the time of abnormal patterns for further analysis.

3. Blood Oxygen Level Graph

  • The graph shows whether oxygen levels remain stable during sleep.
  • Repeated dips in oxygen levels may suggest apnea.

4. Sleep Stage Graph

  • Observe the proportion and cycle of deep sleep, REM sleep, and light sleep.
  • Abnormally short deep sleep times may indicate sleep apnea.

5. Sleep Quality Survey Results

  • Record subjective sleep quality (e.g., PSQI) using the app’s survey feature.
  • Compare subjective impressions with objective data to derive improvement points.

Major Risk Factors

  • Obesity: Higher body fat, especially abdominal fat, increases risk.
  • Age: More common in individuals over 50.
  • Gender: Men are more prone to sleep apnea before menopause, while postmenopausal women face increased risk.
  • Cardiovascular disease, diabetes, and smoking also raise risk.

Prevention and Improvement

  • Weight Management: Engage in regular exercise and maintain a healthy diet to lose weight.
  • Change Sleeping Position: Try sleeping on your side instead of on your back.
  • Improve Sleep Environment: Ensure a dark, quiet sleeping space.
  • Lifestyle Changes: Quit smoking and limit alcohol consumption.

Consult a Professional
  • If abnormalities are detected through Vital Ring data, consult your primary physician.
  • Your doctor may refer you to a sleep disorder clinic if needed.
Polysomnography (Sleep Study)
  • Undergo a detailed examination at a sleep clinic, including heart rate, blood oxygen levels, and brain wave analysis.
Treatment Options
  • CPAP: A continuous positive airway pressure machine maintains airflow.
  • Oral Appliance: Devices keep the airway open.
  • Surgery: In specific cases, procedures like tonsil removal may be required.

Vital Ring is not a medical device and is not intended to diagnose, treat, cure, monitor, or prevent any medical conditions or diseases.


Vital Ring is a useful tool for identifying early signs of sleep apnea and improving sleep quality through data analysis. However, formal diagnosis must be made by a medical institution. Maintain healthy sleep and quality of life through consistent monitoring and professional consultations.