This article gives a great insight into how sport scientists need to monitor athletes individually. It all depends on their response to certain stimulus and then how sport scientists and coaches can modify their training.
This line explains from the article is a great example:
“However, those who had a greater desaturation during hypoxic exercise had an attenuate recovery 24 h post-exercise and may be more susceptible to accumulating fatigue with subsequent training bouts”.
Food for thought!