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© 1995 Oxford University Press

research-article

Circadian Body Temperatures and the Effects of a Cold Stress in Elderly and Young Subjects

K. J. COLLINS1, T. A. ABDEL-RAHMAN1, J. GOODWIN2 and L. McTIFFIN3

1Department of Geriatric Medicine, University College and Middlesex School of Medicine London WC1E 6BT
2St Loye's School of Occupational Therapy Millbrook House, Exeter EX2 6ES
3Environmental Medicine Unit, Institute of Naval Medicine Alverstoke PO12 2DL

To determine whether there is a decrement in normal resting body temperature with age, 11 healthy elderly and 11 young adults were studied together for 48 h in warm (21°C) ambient conditions. The resting levels and daytime rhythms of urine and oral temperature were similar, but night-time body temperature fell to a lower value in the young. There were time-of-day effects of increasing skin temperature and metabolic rate in both groups with resting levels higher in the young. After 6 h in cold (6°C) conditions, core (urine) temperature fell by 0.4°C in the elderly subjects but was maintained in the young, and the rise in blood pressure in the elderly exceeded that in the young. Self-reported arousal, however, increased equally in both groups in the cold.

Revision received April 13, 1995.
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