Table 5.2 (page 59) of his training bible details how long you held either your LT or your Anaerobic Endurance. Not sure which he means here as book is not clear on the matter. I'm guessing the test should be how long you can sustain an effort above your LT and not above your Anaerobic Endurance. Basically am asking is the minimum heart rate for this test your min 5A or 5B zone?