Neuroendocrine Control of the Onset of Puberty

Wierman, Margaret E.; CrowleyJr., William F.

doi:10.1007/978-1-4899-0522-2_10

Cited by 17 publications

(9 citation statements)

References 83 publications

(66 reference statements)

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“…The appearance of testosterone in the blood of the girls at breast stages II or III, as well as signi®cant increases in testosterone concentrations both before and after exercise in advanced maturation stages re¯ect, obviously, the adrenarche (see Wierman and Crowley 1986).…”

Section: Discussionmentioning

confidence: 98%

“…The study was aimed at examining whether there are sexual maturation-related alterations in the responses of female sex hormones (b-oestradiol and progesterone), testosterone and growth hormone. It has been suggested that the pattern of the growth hormone response should be related to the pubertal growth spurt (see Rogol 1980) and of testosterone to the adrenarche coinciding with sexual maturation (see Wierman and Crowley 1986). To characterize possible alterations in general endocrine status, related to intense production of sex hormones, the responses of cortisol and insulin were also studied.…”

Section: Introductionmentioning

confidence: 99%

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Exercise-induced hormone responses in girls at different stages of sexual maturation

Viru

Laaneots

Karelson

et al. 1998

European Journal of Applied Physiology

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The dependence of exercise-induced hormone responses on sexual maturation was tested in a 3-year longitudinal experiment on 34 girls (aged 11-12 years at the beginning). Sexual maturation was evaluated by Tanners five-stage scale. Children cycled for 20-min at 60% maximal oxygen uptake once a year. Cortisol, insulin, growth hormone, beta-oestradiol, progesterone and testosterone concentrations in venous blood were determined by radioimmunoassay procedures. Basal concentrations of growth hormone increased and of cortisol decreased when breast stage III was reached. Reaching breast stage IV was associated with an increase in basal concentrations of beta-oestradiol, progesterone and testosterone. The exercise induced significant increases in concentrations of cortisol, growth hormone and beta-oestradiol and a decrease in insulin concentration. At breast stage III the increase in cortisol concentration was to a lower level [467 (SEM 42) vs 567 (SEM 46)nmol x l(-1)] and growth hormone concentration to a higher level [29.4 (SEM 0.5) vs 12.8 (SEM 0.4)ng x ml(-1)], while the fall in insulin concentration was less pronounced [postexercise level 10.6 (SEM 0.9) vs 7.8 (SEM 0.8)mU x l(-1)] than in stage II. The magnitude of the cortisol response was reduced in the last stage of breast development (+42.1% vs +55.5% at stage II, +66.2% at stage III, and +50.0% at stage IV). The magnitude of beta-oestradiol response was the lowest in breast stage IV (+15.8%) and the highest at stage V (+41.1%). The progesterone response became significant at stage IV and testosterone response at stage V. In conclusion, we found that reaching breast stage III was associated with altered responses of cortisol, insulin and growth hormone concentrations while the responses of the sex hormone concentrations became pronounced in the last stages of sexual maturation.

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Section: Discussionmentioning

confidence: 98%

Section: Introductionmentioning

confidence: 99%

Exercise-induced hormone responses in girls at different stages of sexual maturation

Viru

Laaneots

Karelson

et al. 1998

European Journal of Applied Physiology

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show abstract

“…The contribution of anabolic influences also arises in girls during sexual maturation due to the fact that testosterone appears in blood of girls in detectable amounts at maturity stage 2. Further increases in testosterone levels occur around the age of 12 to 13 years reflecting adrenarche (Wierman and Crowley, 1986). Simultaneously, in females, the anabolic action of testosterone enhances the dependence on oestrogens (Danhaive and Rousseau, 1988).…”

Section: Theoretical Considerationsmentioning

confidence: 98%

“…Gonadal maturation is by far the most important of these components, since it orchestrates the appearance of secondary sexual characteristics via steroidogenesis and ensures the ability to reproduce via gametogenesis (Wierman and Crowley, 1986). Sex hormones stimulate growth hormone secretion (Marie, et al, 1994;Rogol, 1996) which in turn is essential for the adolescent growth spurt.…”

Section: Significance Of Sexual Maturationmentioning

confidence: 99%

Critical Periods in the Development of Performance Capacity During Childhood and Adolescence

Viru¹,

Loko²,

Harro³

et al. 1999

European Journal of Physical Education

157

158

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“…[88][89][90][91] Of the number reviewed, it was Knorr et al, 92 who best provided information about shifts in testosterone level related to adolescence. In turn, their data furnished external evidence useful in validating the AVC model.…”

Section: Avc Durationmentioning

confidence: 99%

On Pubescent Voice Change in Males

Hollien¹

2012

Journal of Voice

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Neuroendocrine Control of the Onset of Puberty

Cited by 17 publications

References 83 publications

Exercise-induced hormone responses in girls at different stages of sexual maturation

Exercise-induced hormone responses in girls at different stages of sexual maturation

Critical Periods in the Development of Performance Capacity During Childhood and Adolescence

On Pubescent Voice Change in Males

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