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When Willie Wet the Bed
Fathering poetry about a classic problem.

Discipline
When adult control fails, the resulting power vacuum is filled by gangs and bullies. By Clyde Verner.

Teaching Children the Importance of Winning
Encouraging in our children the drive to win can be just as important as teaching them to lose gracefully. By Chris Call.

Suggestions for the New Single Father
Russel Wayne provides some immensely practical childcare tips for the man who has to go it alone.

Promoting Your Child's Balanced Development
Giving your children the opportunity to develop a special talent can provide them with a sense of their uniqueness and be a healthy enhancement to their self esteem. By Gerald Alpern.

Classical Fathering versus the Judeo-Christian Model
We interview historian Frederick Hodges about raising children with classical Western values by avoiding the methods imposed on the West by Middle-Eastern religions.

What Fathers Do
by Jack Kammer.

The Fathering Advisor
Selected Reader Mail Gets Our Response

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Home > Puberty > Timing

timing of puberty

our brain tells our sex organs when to mature, controlling them via chemical signals from the hypothalamus-pituitary-gonadal (HPG) axis





Stages of Puberty
It is the brain which tells our sex organs when to mature.

See discussion of the newest devices for pubic hair removal at home.

The data show that 27.3% to 37.8% of Mexican American, African American, and white boys had Tanner stage 2 genitalia at age 8, with 31.6% to 58.2% reaching that stage at age 9 years. These data are strikingly different from earlier studies in which as few as 0.62% (at -2.5 SDs) achieved this level of development.
Arch Pediatr Adolesc Med 2001 Sep;155(9):1022-8


The median (mean) ages at the onset of genital and pubic hair growth were younger than in past studies. Additional studies are required to further evaluate these findings and to explore the public health implications.
NIH: Arch Pediatr Adolesc Med 2001 Sep;155(9):1022-8


...evidence has gradually accumulated that indicates that sex steroid-induced modulation of growth hormone secretion is a central and critical feature of the pubertal growth spurt. As a result, disorders of either growth hormone or sex steroid hormone production may result in clinical growth disorders during puberty.
NIH: Endocrinol Metab Clin North Am 1991 Mar;20(1):165-82


In conclusion, we could not provide any biochemical evidence for nonclassical congenital adrenal hyperplasia in a large group of children with precocious adrenarche.
J Clin Endocrinol Metab 1989 Oct;69(4):709-15

Biochemical signals which facilitate:
-slowing of HPG axis maturation
+acceleration of HPG axis maturation

-CRF: corticotrophin-releasing factor
-ßEND: ß-endorphins
-GABA: ý-aminobutyric acid
-Glu: glutamic acid
-5HT: 5-hydroxytryptamine (serotonin)
-MT: melatonin
-NPY: neuropeptide Y

+DA: dopamine
+NE: norepinephrine
+NO: nitric oxide
+synaptic plasticity (PGE2: prostaglandin E2; EGFR: epidermal growth factor receptor; TGFa: transforming growth factor a.; IGF,: insulin-like growth factor)

other factors affecting timing of HPG axis maturation:
nutrition
genetics
exogenous (pseudo) hormones
social/psychic environment



Back to puberty index page

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