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A sample of 204 male and 224 female healthy Jordanian children was selected to determine the normal ventilatory functions of this Arab population. Forced vital capacity (FVC), one-second forced expiratory volume (FEV1), and forced mid-expiratory flow rate subject were recorded. The lung volumes measured were subsequently computed for body temperature and normal barometric pressure saturated (BTPS), the formulae quoted by Cotes being used.9For the analysis of the results the indices of lung function were expressed as logarithms and regressed on the logarithms of stature and also on the indices of age and weight. The 1% level of probability was accepted as significant. ResultsThe (table 4). FEV,% has a poor correlation with all the other pulmonary function values as well as Table 1 Age and sex distribution ofchildren studied Age (v) No ofbovs No ofgirls

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Serum testosterone, luteinizing hormone (LH), follicle-stimulating hormone (FSH) and prolactin (PRL) responses to exposure to sea-level altitude (LA) were examined in 13 eugonadal males, age 21-22 yr, 3 and 5 days after residing at LA and on the second day of return to basal altitude 90 days later. After 3 days at their respective residence altitude, there was elevation in LH (p less than 0.05) and depression in testosterone levels (p less than 0.05), with similar results on day 5. These effects were all of transient nature, LH and testosterone concentrations returned to their basal levels on second day of the return to basal altitude. The FSH and PRL levels did not show any significant change during the stay at LA or after return to basal altitude. The observations suggest that exposure to LA is associated with increase in plasma levels of LH and decrease in testosterone. The decreased levels of testosterone could be due to a reduction in the sensitivity of the testis to LH, or due to inhibition of steroidogenesis in the testis.

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