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Here is this is one of many papers from Prof. Christian Cook and Co.  We love reading these types of papers as they are really applied and use elite athletes:

 

Changes in salivary testosterone concentrations and subsequent voluntary squat performance following the presentation of short video clips

Christian J. Cook

Blair T. Crewther

 

https://doi.org/10.1016/j.yhbeh.2011.09.006

 

Abstract

Previous studies have shown that visual images can produce rapid changes in testosterone concentrations.

 

We explored the acute effects of video clips on salivary testosterone and cortisol concentrations and subsequent voluntary squat performance in highly trained male athletes (n = 12). Saliva samples were collected on 6 occasions immediately before and 15 min after watching a brief video clip (approximately 4 min in duration) on a computer screen. The watching of a sad, erotic, aggressive, training motivational, humorous or a neutral control clip was randomised. Subjects then performed a squat workout aimed at producing a 3 repetition maximum (3RM) lift.

 

Significant (P