Salivary testosterone and EEG spectra of 9- to 11-year-old male children.

Although most investigators agree that there are electroencephalogram (EEG) changes with chronological age around puberty, no one has remarked on why this is so. As the increase in testosterone at the end of prepubertal childhood is a biomarker for the on-set of a period of accelerated growth and development, we searched for an association between testosterone level and the spectral power and topography of EEG. We tested 60 children between 9- and 11-years-old, each demonstrating normal neurological examination and Wechsler intelligence scale over 90.

Relationship of insulin resistance and overweight with cortisol and dehydroepiandrosterone-sulfate levels.

Background: Our objective was to assess the relationship of hormones such as cortisol and dehydroepiandrosterone-sulfate (DHEA-S) with insulin resistance and overweight.

Methods: We designed and conducted a cross-sectional, observational survey consisting of home visits within a previously defined area of Mexico City. The study included 303 apparently healthy volunteers from a middle-class socioeconomic urban community.