Just to go in to more detail for the people who downvoted me. A big problem in this industry is people jumping on every single study and not looking at the details of the study. This would need to be done for longer and much more people in the study for this to be of any worth.
Do any of you think a study with 18 people in means a lot, or proves anything? Not a single good coach would look at this and let it influence their opinion. It’s always novices or over thinkers who react to limited studies like this.