Correspondence
The bones and hormones of deep water divers and pilots of high performance aircraft
I have hypothesised that paternal hormone concentrations around
the time of conception partially control the sex ratio (proportion male) of resulting offspring. Low concentrations of the
testosterone/gonadotropin ratio are associated with subsequent
daughters.1 Such low offspring sex ratios have been
reported by operators of high performance aircraft2-4 and
deep water divers.5 6 In accordance with my hypothesis,
low testosterone/gonadotropin ratios in men have been reported in
association with changes in gravitation (as are experienced by
operators of high performance aircraft)7 8 and strongly
suspected in association with changes in atmospheric pressure (as are
associated with deep water diving).9 10 It is now clear
that high performance aircraft pilots are at increased risk of
degenerative lesions of the cervical spine11 and that deep
water divers are also subject to skeletal
degeneration.12 13 Low testosterone concentrations are an
established risk factor for osteoporosis and bone fractures in
men.14 15
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