iPhysioMeter: a smartphone photoplethysmograph for measuring various physiological indices

Area of Science:

• Biomedical Engineering
• Mobile Health Technology

Background:

• Photoplethysmography (PPG) is a non-invasive optical technique to measure blood volume changes.
• Smartphone applications offer potential for accessible physiological monitoring.

Purpose of the Study:

• To introduce iPhysioMeter, a novel smartphone application for PPG-based physiological measurements.
• To detail the technology enabling PPG on smartphones and guide correct usage for data accuracy and safety.

Main Methods:

• Utilizes smartphone camera and light for PPG signal acquisition.
• Implements algorithms to calculate heart rate (HR) and normalized pulse volume (NPV) from the PPG signal.
• Provides guidelines for optimal operation to ensure data validity and user safety.

Main Results:

• Demonstrates the feasibility of performing PPG and calculating HR and NPV using only a smartphone.
• Identifies potential pitfalls in operation that could lead to inaccurate data or safety concerns.
• Establishes correct procedures for reliable physiological measurements.

Conclusions:

• iPhysioMeter facilitates basic physiological measurements (HR, PV) using readily available smartphone technology.
• Emphasizes the importance of adhering to specific operational guidelines for accurate and safe use.
• Promotes the use of smartphones for accessible physiological monitoring applications.