Remote photoplethysmography provides robust heart rate estimation but shows limited reliability for HRV and PRVRemote Heart Rate Monitoring Shows Promise for Tracking Anxiety

Frontiers in Medicine Published August 20, 2026 Study authors: Arshad Nasser, Malak Baslyman, Sami Elferik DOI ↗ Editorial oversight: Dr. Amelia Tan, PhD · Internal Medicine & Chronic Disease

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Key Takeaway

Note that rPPG offers robust heart rate estimation but is limited by motion and lighting for HRV and PRV reliability.

This scoping review synthesized 20 empirical studies to evaluate the physiological validity of remote photoplethysmography (rPPG) as a tool for monitoring heart rate (HR), heart rate variability (HRV), and pulse rate variability (PRV) in contexts involving stress and mental workload. The review assessed data from laboratory, academic, online-interaction, and telehealth settings.

The synthesis indicates that rPPG supports robust non-contact heart rate estimation. However, the reliability of HRV and PRV measurements is notably compromised by specific environmental factors, including head motion, illumination variability, and short analysis windows.

A significant limitation noted by the authors is that many included studies rely on protocol labels or wearable references rather than establishing agreement against gold standards like electrocardiography (ECG) or high-quality contact photoplethysmography. This lack of gold-standard comparison constrains the established physiological validity of rPPG for complex metrics like HRV and PRV.

Clinically, these findings suggest that while rPPG may be useful for basic heart rate monitoring in remote settings, its utility for nuanced stress assessment via HRV or PRV is currently limited by environmental factors and technical constraints. The review provides a basis for reporting recommendations to improve reliability in ecologically relevant settings.

How this fits prior evidence

This scoping review addresses a gap in the technological infrastructure for monitoring mental health. While prior coverage identified that digital interventions outperform non-digital treatments for social anxiety disorder, this study evaluates the specific physiological validity of rPPG as a remote monitoring tool. It provides technical context on how heart rate and variability can be measured remotely to support such interventions.

Researchers reviewed 20 studies to see if remote photoplethysmography (rPPG) is a reliable way to measure heart rate and stress levels. This technology allows for non-contact heart rate monitoring using cameras rather than wearable devices. The review found that rPPG provides robust results for estimating heart rates in various settings, including online interactions and telehealth.

However, the accuracy of more complex measures like heart rate variability (HRV) and pulse rate variability (PRV) can be inconsistent. These specific metrics are often affected by head movement, changes in lighting, or very short periods of data collection. Because these factors can interfere with results, the technology may not always provide a perfect picture of stress.

Currently, many studies lack a direct comparison to gold-standard medical equipment like electrocardiograms (ECG). While rPPG is promising for monitoring mental workload in real-world settings, its reliability depends heavily on the environment. You should talk with your doctor about how these technologies might fit into your specific care plan.

What this means for you:

Remote heart rate tracking shows promise for stress monitoring but can be affected by movement and lighting conditions.

Common questions

Is remote heart rate monitoring accurate for tracking anxiety?

The review of 20 studies suggests that rPPG provides robust non-contact heart rate estimation. This means it can be a useful tool for monitoring stress and mental workload in various settings, including telehealth and online interactions.

What factors can make these heart rate readings less accurate?

The reliability of specific metrics like heart rate variability (HRV) and pulse rate variability (PRV) can decrease if there is head motion, changes in lighting, or if the analysis window is too short. These environmental factors are important to consider when using remote monitoring.

How does this technology compare to standard medical equipment?

Many current studies do not have a direct agreement with gold-standard electrocardiography (ECG). Because of this, the physiological validity of these systems can be limited when compared to high-quality contact sensors.

Study Details

Study typeSystematic review

EvidenceLevel 1

PublishedAug 2026

View Original Abstract ↓

Remote photoplethysmography (rPPG) enables non-contact estimation of cardiovascular signals from ordinary cameras and has been increasingly applied to stress and mental workload assessment using heart rate (HR), heart rate variability (HRV), and pulse rate variability (PRV). However, reported performance varies substantially across studies, and stress-classification results are often presented without sufficient physiological validation, limiting interpretability and generalizability. This paper presents a PRISMA-ScR-guided scoping review of rPPG-based stress and mental workload research published between January 2010 and March 2026. Searches across Scopus, IEEE Xplore, PubMed, ACM Digital Library, and Google Scholar identified 20 empirical studies meeting predefined inclusion criteria (stress, mental workload, anxiety, and stress-related arousal outcomes); additional references were retained for background (methods, datasets/benchmarks, bias, and wearable comparisons) and were excluded from PRISMA counts. The literature is synthesized across laboratory, academic, online-interaction, and telehealth contexts, with emphasis on signal-processing pipelines, physiological targets, validation strategies, and deployment conditions. The reviewed evidence indicates that rPPG supports robust non-contact heart-rate estimation, while HRV/PRV reliability degrades under head motion, illumination variability, and short analysis windows commonly used for stress inference. Many studies rely on protocol labels or wearable references without agreement against electrocardiography or high-quality contact photoplethysmography, constraining physiological validity. Based on these findings, this review provides a validity-oriented synthesis and reporting recommendations to support reliable rPPG-based stress and workload assessment in ecologically relevant settings.

Remote photoplethysmography provides robust heart rate estimation but shows limited reliability for HRV and PRVRemote Heart Rate Monitoring Shows Promise for Tracking Anxiety

How this fits prior evidence

Common questions

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Remote photoplethysmography provides robust heart rate estimation but shows limited reliability for HRV and PRVRemote Heart Rate Monitoring Shows Promise for Tracking Anxiety

How this fits prior evidence

Common questions

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