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Are psoriatic patients at risk of heat intolerance?
Author(s) -
LEIBOWITZ E.,
SEIDMAN D.S.,
LAOR A.,
SHAPIRO Y.,
EPSTEIN Y.
Publication year - 1991
Publication title -
british journal of dermatology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 2.304
H-Index - 179
eISSN - 1365-2133
pISSN - 0007-0963
DOI - 10.1111/j.1365-2133.1991.tb00622.x
Subject(s) - medicine , dermatology , psoriasis
Summary Sixteen young male subjects with psoriasis (mean of 4.9% of skin surface area involvement) and 10 healthy controls underwent a heat exercise test (40 °C, 40% r.h.) for 2 h. Rectal temperature (Tr). mean skin temperature (Tsk), heart rate (HR) and heat storage (dS) were measured and calculated. A sharper rise was found for all parameters in the psoriatic patients as compared with controls. Statistically significant differences were found in Tr after 60 min (37.9 ± 0.1°C and 37.5 ± 0.1°C in patients and controls, respectively) and at termination of the exercise (38.3 ± 0.1°C and 37.5 ± 0.1°C). Heat storage at the end of the first hour was 78 ± 9 and 30 ± 7 kcal in patients and controls, respectively. At the end of 120 min. heat storage in the study group increased to 87 ± 14 kcal. while the control group stored only 30 ± 7 kcal. Sweat rate was lower in the psoriatic patients (590 ± 49 g/h) than in controls (691 ± 42 g/h). even when corrected for healthy skin area (337 ± 26 g/h/m2 compared with 370 ± 24 g/h/m 2 ). It is suggested that psoriatic patients have a reduced ability to dissipate extra heat during exposure to exercise in the heat. Psoriasis should therefore be considered as a risk factor for heat intolerance.