# Validity of Ultra-Short-Term HRV Analysis Using PPG—A Preliminary Study

> Research article (Sensors, 2022) · cited 28× · AI/ML

**Wikidata**: [openalex:W4306966001](https://www.wikidata.org/wiki/openalex:W4306966001)  
**Source**: https://4ort.xyz/entity/validity-of-ultra-short-term-hrv-analysis-using-ppga-preliminary-study