Apple Patents Smartwatch Sweat Sensor to Measure Workout Hydration Levels
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Apple patented a sweat sensor for smartwatches to measure sweat rate and fluid loss during workouts. This would provide data like ounces lost per hour.
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The sensor would use electrodes and measure things like temperature and humidity to contextualize the sweat data.
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It could show real-time, instantaneous sweat rate from the past 15-30 seconds during a workout.
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The data could help athletes know how much fluid to replenish post-workout or determine fitness level based on sweat rate.
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No other smartwatch currently measures actual sweat rate and fluid loss like this, though some estimate sweat loss based on other data.