Measuring sleep by more than just winks
Over six weeks, I undertook three functional threshold power (FTP) tests on a Wattbike at Fitness First (fitnessfirst.co.uk), comprising 20-minute power and maximum minute power tests. I also did a daily Psychomotor Vigilance Test (PVT) to measure reaction times in milliseconds over two minutes (go to sleepdisordersflorida. com/pvt1.html to have a go), and kept a sleep diary with data logged via a Fitbit Blaze activity tracker (£159.99, fitbit.com). Here are the results.