Hello,
if you are interested I wrote a blog post on a relatively new study on "NO LOAD" training, which is basically working with co-contractions (visualized resistance training).
Lately I came across a new interesting study which compared weight training to resistance training where participants contracted as hard as they could through the full range of motion without using any load. This is one of the training principles of Focused Muscular Tension based exercises, see http://dhyana-fitness.at/wordpress/focu ... exercises/. One of the authors was kind enough to send me the article via Research Gate. The study design comprises two training conditions.
http://dhyana-fitness.at/wordpress/the- ... -training/