Polar is a Finnish sports technology company credited with inventing wearable heart-rate monitoring. Polar Electro is founded in 1977 by professor Seppo Säynäjäkangas in Kempele, near Oulu, Finland, after a chance conversation with a ski coach about measuring athletes' heart rates in the field. The company files its first heart-rate monitor patent in 1979 and in 1982 launches the Sport Tester PE 2000, the first wireless wearable heart-rate monitor, a breakthrough that brings laboratory-style training measurement to everyday athletes and establishes heart-rate-based training as standard practice in endurance sports. Today Polar makes GPS sports watches such as the Vantage and Pacer series for runners and triathletes, the Grit X line for outdoor training, the Ignite fitness watches, and heart-rate sensors including the chest-strap H10, which is widely regarded as a reference device for heart-rate accuracy and is often used to validate other wearables. Its Polar Flow platform provides training load, sleep, and recovery analytics, with proprietary metrics such as Training Load Pro and Nightly Recharge. Polar remains a private, family-connected company headquartered in Kempele, sells in more than 80 countries, and supplies heart-rate technology to gyms and research institutions as well as consumers. While smaller than rivals Garmin and Apple in the smartwatch era, Polar retains a loyal following among endurance athletes and coaches for its physiology-first approach to training guidance.
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