Consistent timing of the VO2 max test, ideally in the afternoon, is recommended due to circadian rhythm fluctuations affecting body temperature and performance.

“so on the day of the test itself I would I would one is important timing of the day this is important to try to keep somewhat consistent I would say because of the Circadian rhythm you know that for example your your uh temperature levels in your body this fluctuates this is maybe one of the easiest observable differences in a human basically as a call it as an indirect measure of the Circadian rhythm where we basically see that you have a minimum point that happens typically in the morning just before you wake up and then you have a maximum Point typical in the afternoon and there is of course plenty of research suggesting that aerobic exercises are best done normally a little bit in the afternoon when you”