Thank you, this is great to read! This study (the first one) still doesn’t control for obvious variables re: what fatherhood could be doing physiologically. For example, men who are relatively new fathers skew toward these things: sleep deprived, decrease in sexual activity, and increased stress in managing multiple jobs (work, childcare, partner care, and others). And since a pro cyclist who is a father riding the Tour is not having to deal with these things (except for having less sex) than an average working Joe, That raises the question of whether it’s applicable.Some different studies done throughout the years.
Longitudinal evidence that fatherhood decreases testosterone in human males - PMC
In species in which males care for young, testosterone (T) is often high during mating periods but then declines to allow for caregiving of resulting offspring. This model may apply to human males, but past human studies of T and fatherhood have ...www.ncbi.nlm.nih.gov
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Testosterone Levels Are Negatively Associated with Childlessness in Males, but Positively Related to Offspring Count in Fathers
Variation in testosterone (T) is thought to affect the allocation of effort between reproductive and parenting strategies. Here, using a large sample of elderly American men (n = 754) and women (n = 669) we examined the relationship between T and self-reported parenthood, as well as the...journals.plos.org
I mean, if there’s just something about being a father (i.e., producing an offspring) that drops testosterone enough to effect performance (not part of these studies), a blunt take from this would be that teams should discourage male riders from having kids. Which of course they won’t.
I still haven’t ld that Rasmussen’s take is bull. But obviously I can’t substantiate that any farther, so I’ll leave it at that,