Based on the research done by Prof.Kraemer in 2001 about Circadian rhythm of endocrine hormones, it was shown that, there is no differences between Tes and Cor in the morning and afternoon. I did an update on this research and I got same results. But among bodybuilders, and based on my experience as a coach, there is a meaningful improvement in power and mass of muscles, once the resistance training be done in the afternoon (we never used any supplement or steroids and we had a normal diet). What is the main reason?
http://journals.lww.com/nsca-jscr/Abstract/2015/01000/Intensive_Resistance_Exercise_and_Circadian.19.aspx
Lower melatonin in the afternoon (practically at low point).
References:
Interactions of cortisol, testosterone, and resistance training: influence of circadian rhythms. Hayes LD, Bickerstaff GF, Baker JS. Chronobiol Int. 2010 Jun;27(4):675-705. doi: 10.3109/07420521003778773
Epinephrine preworkout elevation may offset early morning melatonin concentrations to maintain maximal muscular force and power in track athletes. Kraemer WJ, Boyd BM, Hooper DR, Fragala MS, Hatfield DL, Dunn-Lewis C et al. J Strength Cond Res. 2014 Sep;28(9):2604-10. doi: 10.1519/JSC.0000000000000392.
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