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interesting study that showed that testosterone levels in men and women fluctuate seasonally.  The highest levels are found in the fall for both sexes, but lowest during the summer.  Interestingly, birth control eliminated these seasonal variations and resulted in a "flatter seasonal testosterone profile".   So, maybe mean cycle, but on a much different time scale?  Interesting thought.

no surprise that genetic variations play a role in lipid metabolism: in this study they looked at the effects of genetic variations and lipoproteins.

Seasonal variations of Testosterone production vary significantly.  This was effected by the waist to hip ratio.  

another article discusses the seasonal variation of testosterone.  Again, testosterone levels are shown to be highest in the fall months and lowest during the summer months.  This has been found to be the case in both sexes.

genetic variations effect the bodies ability to build muscle through protein metabolism. 

study finds variation of thyroid values within the reference range have physiologic impact.  The point is: just because the values are "normal" does not mean the thyroid function is normal.

Salivary steroid assays for assessing variation in endocrine activity.

Menstrual variation in salivary testosterone among regularly cycling women.

This study looked at T:E2 levels in men for seasonal fluctuations.  What is interesting, is that the T:E2 ratio is at it's lowest during the fall months and highest during the summer months.  This does conflict somewhat with studies that have looked at seasons fluctuations of T alone.  But, it does correlate with changes in body habitus and activity levels.

Study finds variations in calculated free testosterone.  Most of the variability is from the total testosterone, lesser due to the formulas, and third to the SHBG assay.  The point here, is there are too many variables to place a lot of weight on calculated free T in serum. Jus test it in the saliva.

great review of hormone changes associated with aging in men.

Re-analysis of Carlsen's work on sperm count finds consistent decline in sperm count.  Swan and authors found a 1.5% decline in US men from 1934-1996 and 3% annual decline in European/Australian men over same time frame.  This was a meta-analysis of 101 studies from 1934-1996.  Yes, there is geographical variation, but the overall trend is one of decline.

Study used saliva to measure Testosterone levels in men.  Testosterone levels were inversely associated with age, but positively associated with CAG repeat sequences in the AR.

Epigenetics plays a role, via disregulated miRNA, in increased cell growth, progression, and invasion in Lebanese women with breast cancer.  It is not just genetics that play a role, but epigenetics.

Barbell bent over row. There are two different variations that i'm going to show you. The first one is going to be coming directly up the legs and the other one is going to be bent over. Both of them, you want to make sure that you keep your back flat. You want to grab the bar, a little bit wider than shoulder-width apart. I use wraps because my grip isn't real good and after a while it starts to tire. So the wraps will help you to make sure that you get a good grip on it. So the first thing we're going to do, is we are going to go up directly up the legs. So we're going to grab the bar, straighten up, move back to our desired positioning. We're going to bend our waist, push your hips back, we're coming directly up the legs. Shoulders back, chest out.

low testosterone in boys associated with anxiety/depression and attention problems.  Disruptive behavior found in girls with low testosterone.  All determined by salivary testing.

good review of androgens and AR.

4 week resistance training program found to increase androgens in urine; this suggests increased androgen production as a result of the resistance program

this article looked at normal testosterone rhythm  via saliva.  Normal testosterone peaks in am and is lowest in pm. The normal testosterone rhythm decreases as a man ages.  This is similar results as seen in serum.

adrenocortical dysfunction found to play a role in CFS