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Biomedical subjects

J S Chisholm

Publications and source records attributed to J S Chisholm.

3 recordsLinked to original sources

Evolution and inequality.

Some scientists remain wary of evolutionary theory because of its supposed genetic determinism and insensitivity to the inequalities often associated with gender, race and class. Our aim is to show that such fears are outdated and to foster a role for evolutionary theory in public health. We use complex adaptive systems theory and the concept of a tradeoff between current and future reproduction to argue that when the future is objectively risky and uncertain the optimal reproductive strategy will often be to reproduce at a young age and/or high rate. Because reproducing early and/or often can lead to ill health and shortened lives, and because inequality is a major source of environmental risk and uncertainty, we argue that any attempt to use evolutionary theory to understand human reproduction, health or wellbeing must include considerations of inequality and social capital.

Adolescent↗

Maternal blood pressure in pregnancy and newborn irritability.

The neonatal period is being recognized as an important period for the development of patterns of interaction between mother and infant, and infant state has been shown to have a significant impact on mother--infant interactions. A major dimension of infant state, with implications for this interaction and for the development of later behaviour disorders, is the infant's irritability. Research with Navajo, Malay, Chinese and Tamil mothers and infants showed that normal variation in maternal blood pressure during pregnancy was related to newborn irritability as assessed with the Brazelton Scale. This relationship is discussed in terms of possible underlying mechanisms.

Blood Pressure↗

Swaddling, cradleboards and the development of children.

The cross-cultural and historical use of techniques of infant restraint, swaddling with or without the use of a board or cradle, are described. Such techniques were used very widely in temperate latitudes but have declined since the 18th century. Laboratory experiments indicate that swaddled babies sleep more, have reduced levels of motor activity in response to stimulation, fewer startles and lower heart-rate variability. No clear long-term effects of swaddling have been demonstrated. Results are reported of an ethological study of cradleboard use among Navajo Indians. Time on cradleboard declined from about 16 h a day in the first 3 mth to less than 9 h by the first birthday. The extent of cradleboard use was determined by both infant and parental actions. As compared with European infants, Navajo babies spend much more time in actual or potential social contact with adults. It is suggested that swaddling and cradleboard might be used in western cultures to reduce the social iolation of infants, to reduce parental child tension with 'sleep problem' babies and in various paediatric situations.

Child Development↗