[Long-term consequences of fetal nutrition]

The short die young: the interrelationship between stature and longevity-evidence from skeletal remains

It has long been observed that tall people display longer life spans. The current data were employed to verify this association within the bioarchaeological context. To this end, stature and its association with age-at-death were analyzed in a pooled sample of 2,923 skeletons. Height was estimated from proxy indicators based on the maximum length of the humerus, radius, femur, and tibia. Stature estimation followed the procedure outlined by Pearson ([1899] Philos. Trans. R. Soc. Lond. [A] 192:169-244), incorporating minor modifications by Rösing ([ 1988] Handbuch der vergleichenden Biologie des Menschen; Stuttgart: Gustave Fischer, p 586-600). Individual age estimates were classified into three mutually exclusive age groups: 20-39 years (591 males, 667 females), 40-59 years (876 males, 499 females), and 60+ years (171 males, 119 females). The results document that both sexes display a statistically significant inverse relationship between adult height and age-at-death (males, P < 0.01; females, P < 0.05). Taking an epidemiological approach, the risk model implies that the estimated odds of survival beyond age 40 improve by approximately 16% for 1 SD in bone length. However, not all bones may be equally adept at displaying the association. The radius failed to support the positive association between stature and longevity, which may be indicative of a relatively greater contribution of environmental factor to radius length. Overall, the relationship between body height and longevity is not causal but coincidental: mitigated by diverse environmental factors such as nutrition, socioeconomic stressors, and disease load.

Adult men born in spring have lower blood pressure

OBJECTIVE

To determine whether there is a relationship between season of birth and adult blood pressure, as a possible early determinant of later blood pressure.

DESIGN

We studied 572 men, aged 45-64 years, whose blood pressure was measured in standardized manner as part of a nation-wide survey in Spain. To analyse the seasonal variation in blood pressure, a linear regression was performed, adjusting for age, height, body mass index, occupation and rural or urban residence.

RESULTS

We found seasonal variation in mean systolic blood pressure, with maxima in adults born in autumn and winter, and minima in those born in spring and summer. The greatest difference in systolic blood pressure occurred between adults born in spring (134.1 mmHg) and those born in autumn (140.3 mmHg). After adjustment, the difference in means between spring and autumn was 5.9 mmHg (95% confidence interval 0.7 to 11.1 mmHg, P = 0.03).

CONCLUSIONS

This study demonstrated differences in systolic blood pressures of adult men according to the season of their birth. Although this relationship is compatible with several hypotheses, the difference found between spring and autumn, partially independent of some other factors, might indicate that the extent of early exposure to sunlight is implicated in determining later blood pressure. This needs further investigation.

[What is new in neonatology?]

Advances in neonatology have been consistent in recent years, both from practical and theoretical points of view. Improved outcome is the result of major developments in neonatal intensive care, but also of the improved organization of perinatal care. Recent concepts on the inflammatory mechanisms of preterm labor and periventricular leukomalacia are opening a new area for preventive intervention. The observed association between the occurrence of diseases such as hypertension in adulthood and intrauterine growth retardation offers a particular insight into the long term programming of physiologic regulations in the fetus. At the bedside, advances in neonatal intensive care have been significant, especially in treating neonatal respiratory failure. This review will focus on recent developments in premature anemia, and in fluid-electrolyte therapy in very low infant birth weights, as both topics have been less frequently reviewed in the pediatric literature. Finally, ethical issues have deserved considerable attention, such as therapeutic intervention in extremely low birth weight infants, decision-taking, and practices in withholding or withdrawing therapy during neonatal intensive care, along with the need for long term follow up and assistance to the patients and their families.