Hilton Hotels, Suites & Resorts Begins First Scientific Study to Measure Travel’s Impact on Personal Performance :: Hotel News Resource describes a “field study” to track the hour-by-hour behavior, stress, alertness and overall performance levels of a select group of male and female frequent business travelers.”. Here is the interesting part: “The second component asks a select group of volunteer business travelers to wear a wrist-worn device, called an actigraph, which measures daytime activity levels and nighttime sleep quality. Each participant also will carry a special PDA during their travels to collect objective information about their performance level and to log information about their moods, activities, eating and other daily habits. “

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