Polar Equine Belt for riding | Monitor your horse's heart rate - YouTube
Frontiers | Agreement between Electrocardiogram and Heart Rate Meter Is Low for the Measurement of Heart Rate Variability during Exercise in Young Endurance Horses
Polar H10 Heart Rate Sensor for Equine with Handle Unisex Adults, Black, One Size : Amazon.co.uk: Sports & Outdoors
5 Reasons to Use a Heart Rate Monitor with Your Horse | Equisense - Blog