EFFECT OF THE THERMAL ENVIRONMENT ON COLD RESISTANCE AND GROWTH OF SMALL INFANTS AFTER THE FIRST WEEK OF LIFE
1 Department of Pediatrics, College of Physicians and Surgeons, Columbia University; Harlem Hospital Center, New York
Twelve matched pairs of small (1,001-2,000 gm birth weight) asymptomatic neonates, age 1 week, were placed in either of two frequently recommended thermal environments ("standard": abdominal skin controlled at 35.0°C to approximate the thermal state commonly realized in nurseries for premature infants; "warm": abdominal skin controlled at 36.5°C to approximate thermoneutral condition). Both groups were fed 120 calories/kg/day.
Before and after 2 weeks in the test environment, the infants were placed in a simulated room environment-28°C incubator wallfor 1 hour and the change in body temperatures was measured.
Cold resistancethe ability to prevent a fall of deep body temperature in the 28°C environment was significantly greater among infants who had spent 2 weeks in the slightly cooler environment. The rate of increase in body weight and length was significantly faster in the warmer condition.
Submitted on October 16, 1967Accepted on December 28, 1967
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