Abstract: A hydration monitoring system for the collection of data about fluid consumption and hydration levels of athletes during training or practice sessions. The system may also measure and analyze carbohydrate consumption. The system utilizes a hydration bottle containing a fluid and to measures the amount of fluid consumed in a given time interval and wirelessly transmit the measurements; and a scale configured to measure the weight of an athlete and wirelessly transmit the measurements. The system further utilizes a data communications hub configured to receive data comprising the measurements from the hydration bottle and scale and forward the data to a computer; and a computer configured to receive the data from the hub for analysis. The computer analyzes the data and calculates whether the athlete should consume more or less fluid and/or more or less carbohydrates.

Abstract: An optical device, such as spectacles or goggles, has a segmented display (3) formed in a transparent substrate by directing light from a number of light sources (15) through respective light guides (14) and reflecting the light out of the transparent substrate at the ends of the light guides (14) to form individually illuminable segments (13). The device has the advantage that an electronically-generated display can be displayed to a viewer in combination with the image transmitted through the transparent substrate simply and relatively inexpensively.