Effect of humidity on production and loss of heat in the newborn baby.

In 1955 Clement Smith wrote: 'Most of us who work in neonatal pediatrics are distressingly familiar with the sight of a small infant surrounded by a fog of vapour within a closed tent or incubator. This situation perhaps symbolizes the present status of this subject, which is essentially a very small body of facts enveloped in a misty atmosphere of speculation, which is walled off from its surroundings by a rigid container of prejudice.' The facts available are still, unfortunately, almost as scanty today as they were in 1955. Since the classic paper of Blackfan and Yaglou appeared in 1933, it has been generally accepted that a moderately high relative humidity is a useful adjunct to the regulation of a baby's body temperature; Day, Curtis, and Kelly, in 1943, showed that up to a quarter of a baby's basal heat loss might be due to evaporation of water from the skin and respiratory tract. We have, therefore, tried to estimate the effect of the relative humidity of the air on total heat production and loss in normal, naked, newborn babies under controlled environmental conditions.

[1]  E. Hey,et al.  Relative humidity in incubators. , 1968, Archives of disease in childhood.

[2]  J. M. Coulson,et al.  Heat Transfer , 2018, Finite Element Method for Solids and Structures.

[3]  J. Hill.  The oxygen consumption of new‐born and adult mammals. Its dependence on the oxygen tension in the inspired air and on the environmental temperature , 1959, The Journal of physiology.

[4]  J. Scopes,et al.  Range of Critical Temperatures in Sick and Premature Newborn Babies , 1966, Archives of disease in childhood.

[5]  C. P. Yaglou,et al.  The Premature Infant. A Study of the Effects of Atmospheric Conditions on Growth and on Development. , 1933 .

[6]  A. Renwick,et al.  Collection of Urine and Faeces in Children, with a note on Fat Balances , 1962, Archives of disease in childhood.

[7]  W. Silverman,et al.  A sequential trial of the nonthermal effect of atmospheric humidity on survival of newborn infants of low birth weight. , 1963, Pediatrics.

[8]  M. Kelly,et al.  RESPIRATORY METABOLISM IN INFANCY AND IN CHILDHOOD: XXVII. REGULATION OF BODY TEMPERATURE OF PREMATURE INFANTS , 1943 .

[9]  L. P. Herrington,et al.  PHYSIOLOGICAL REACTIONS OF THE HUMAN BODY TO VARYING ENVIRONMENTAL TEMPERATURES , 1937 .

[10]  [Determinations of standard energy metabolism (basal metabolism) in normal infants]. , 1952, Acta paediatrica. Supplementum.

[11]  F. G. Benedict,et al.  INSENSIBLE PERSPIRATION: ITS RELATION TO HUMAN PHYSIOLOGY AND PATHOLOGY , 1926 .

[12]  Young Im.  Vasomotor tone in the skin blood vessels of the newborn infant. , 1962 .

[13]  W. Silverman,et al.  The influence of the thermal environment upon the survival of newly born premature infants. , 1958, Pediatrics.

[14]  G. Burch.  Rate of water and heat loss from the respiratory tract of normal subjects in a subtropical climate. , 1945, Archives of internal medicine.

[15]  W. Silverman,et al.  The effect of humidity on survival of newly born premature infants. , 1957, Pediatrics.

[16]  E. Bruck,et al.  WATER IN EXPIRED AIR. II. GRAVIMETRIC DETERMINATION OF WATER CONTENT OF TIMED AND MEASURED SAMPLES OF EXPIRED AIR COLLECTED FROM INFANTS AND CHILDREN. , 1965, The Journal of pediatrics.

[17]  W. Silverman,et al.  Temperature regulation in the newborn infant. , 1966, The New England journal of medicine.

[18]  Z. Sfaello,et al.  [The premature infant]. , 1970, Archivos argentinos de pediatria.

[19]  C L TAYLOR,et al.  Respiratory heart exchange with varying temperature and humidity of inspired air. , 1951, Journal of applied physiology.

[20]  G. Burch.  Study of water and heat loss from the respiratory tract of man; methods: a gravimetric method for the measurement of the rate of water loss; a quantitative method for the measurement of the rate of heat loss. , 1945, Archives of internal medicine.

[21]  H. E. Lewis,et al.  Man in a cold climate. , 1958, Transactions of the Medical Society of London.

[22]  P. Karlberg.  Determination of Standard Energy Metabolism (Basal Metabolism) in Normal Infants , 1953, Acta paediatrica.

[23]  E. Bruck.  Water in expired air: physiology and measurement. , 1962, The Journal of pediatrics.

[24]  K. Brück,et al.  Temperature Regulation in the Newborn Infant (Part 1 of 3) , 1961 .

[25]  E. Merrill,et al.  Heat and water exchange in the respiratory tract. , 1962, The American journal of medicine.

[26]  J. Hill,et al.  Heat balance and the metabolic rate of new‐born babies in relation to environmental temperature; and the effect of age and of weight on basal metabolic rate. , 1965, The Journal of physiology.

[27]  M. Kelly,et al.  THE INSENSIBLE PERSPIRATION IN INFANCY AND IN CHILDHOOD: II. PROPOSED BASAL STANDARDS FOR INFANTS , 1930 .