Why I looked at this

This paper helps answer a very practical question for my project:

Can I realistically get continuous heart / pulse data from a wrist wearable while somebody is moving through an airport?

The answer from this study is probably yes, but not perfectly.

That matters because I am considering a wrist-based sensing route, and one of my concerns has been whether movement would make PPG-derived pulse information too unreliable to be useful in a real airport journey.

This paper does not test airports, autism or sensory overload. What it does test very well is whether a wrist-worn device can estimate pulse rate continuously under both still and moving conditions.

What the paper actually tested

Chen et al. evaluated the Empatica EmbracePlus wristband across three independent clinical studies.

The device was compared against FDA-cleared ECG reference systems while participants completed supervised activities intended to represent real-life conditions.

Across the combined studies:

• 157 participants were included;
• 16,915 paired one-minute observations were analysed;
• 5,621 minutes were recorded under no-motion conditions;
• 11,294 minutes were recorded during motion;
• participants included a range of ages, body sizes, skin tones and health conditions.

This makes the paper much stronger for the narrow question of whether wrist PPG can still produce useful pulse-rate estimates during movement than many small proof-of-concept studies.

The most important technical point: it did not use PPG alone

This is probably the most relevant part for my design.

The EmbracePlus did not simply read a raw PPG signal and treat it as reliable.

Its pulse-rate algorithm used: