Behavioral thermoregulation in older adults with cardiovascular co-morbidities.
Temperature (Austin)
; 5(1): 70-85, 2018.
Article
em En
| MEDLINE
| ID: mdl-29687045
ABSTRACT
We tested the hypotheses that older adults with cardiovascular co-morbidities will demonstrate greater changes in body temperature and exaggerated changes in blood pressure before initiating thermal behavior. We studied twelve healthy younger adults (Younger, 25 ± 4 y) and six older adults ('At Risk', 67 ± 4 y) taking prescription medications for at least two of the following conditions hypertension, type II diabetes, hypercholesterolemia. Subjects underwent a 90-min test in which they voluntarily moved between cool (18.1 ± 1.8°C, RH 29 ± 5%) and warm (40.2 ± 0.3°C, RH 20 ± 0%) rooms when they felt 'too cool' (CâW) or 'too warm' (WâC). Mean skin and intestinal temperatures and blood pressure were measured. Data were analyzed as a change from pretest baseline. Changes in mean skin temperature were not different between groups at CâW (Younger +0.2 ± 0.8°C, 'At Risk' +0.7 ± 1.8°C, P = 0.51) or WâC (Younger +2.7 ± 0.6°C, 'At Risk' +2.9 ± 1.9°C, P = 0.53). Changes in intestinal temperature were not different at CâW (Younger 0.0 ± 0.1°C, 'At Risk' +0.1 ± 0.2, P = 0.11), but differed at WâC (-0.1 ± 0.2°C vs. +0.1 ± 0.3°C, P = 0.02). Systolic pressure at CâW increased (Younger +10 ± 9 mmHg, 'At Risk' +24 ± 17 mmHg) and at WâC decreased (Younger -4 ± 13 mmHg, 'At Risk' -23 ± 19 mmHg) to a greater extent in 'At Risk' (P ≤ 0.05). Differences were also apparent for diastolic pressure at CâW (Younger -2 ± 4 mmHg, 'At Risk' +17 ± 23 mmHg, P < 0.01), but not at WâC (Younger Y +4 ± 13 mmHg, 'At Risk' -1 ± 6 mmHg, P = 0.29). Despite little evidence for differential control of thermal behavior, the initiation of behavior in 'at risk' older adults is preceded by exaggerated blood pressure responses.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Temperature (Austin)
Ano de publicação:
2018
Tipo de documento:
Article