Abstract
We have developed a wristwatch biosensor for sweat lactic acid (SLA) monitoring at the skin's surface. The system utilizes a continuous carrier flow for transporting the secretion on the skin to a downstream lactic acid (LA) biosensor. The biosensor measures the total amount of LA secretion instead of the concentration of LA in the sweat fluid. To minimize the influences of changes in the enclosure angle and muscle deformation, we employed a flexible reservoir unit that prevents the system from significant pressure change. Real-time SLA monitoring during bike exercise using this system showed that the heart rate and sweat rate increased as the exercise load, and the amount of LA secreted increased accordingly.
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