![]() ![]() The filing outlines why hydration is a valuable health metric:Ī user's hydration level has significant impacts on the health of a user. The filing goes on to give a lengthy and detailed technical description of the hydration sensor and its functionality.Īpple says that its hydration tracking system can be performed "non-invasively, repeatedly, accurately, automatically, and with minimal user intervention." According to the patent, hydration data may be used to provide feedback to the user, particularly during activity such as workouts, and encourage better management of water intake, and in turn, overall health. By further example, a low level of electrical conductance of the perspiration can indicate a low concentration of electrolytes and a high level of hydration. ![]() The electrical properties, such as electrical conductance, can represent a concentration of electrolytes in the perspiration, which in turn represents a hydration level of the user.įor example, a high level of electrical conductance of the perspiration can indicate a high concentration of electrolytes and a low level of hydration. The sensor works by measuring the electrical properties of the Apple Watch wearer's sweat. This refers to existing ways of determining hydration such as single-use tests of fluid samples.Īpple's hydration sensor takes the form of non-invasive electrodes that are placed against the skin, which it describes as a "reliable and elegant" solution. ![]() "Traditional techniques for tracking hydration are generally invasive, expensive, or unreliable," according to Apple. The patent, first spotted by Patently Apple, is titled " Hydration measurement with a watch" and was granted by the U.S. Apple has developed a first-of-its-kind hydration sensor designed for the Apple Watch, a company patent filing has revealed. ![]()
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