Perspiratio insensibilis

Calculation of Heat Production From Insensible Loss of Weight 1

“…I. L. is an abbreviation for the insensible loss of weight. 8 These details of the methods and the biological data may be found in earlier publications from this laboratory (1,3,4). as a result of preliminary trials.…”

“…It remains now to compare our earlier complicated calculation 8 of heat production from I. L. with the simple prediction from hourly I. L. alone. Table I makes the comparisons in the 34 chamber experiments.…”

The Relationship Between Insensible Water Loss and Heat Production in Patients With Hypothyroidism Compared With Normal Subjects 1

“…It has been found that the insensible weight loss increases above the basal when a patient assumes the sitting position (8), on activity (9, 10), in fever (1), and usually after eating (1,11,12). Jores (11) and Dieckhoff (12), however, found that the increase in metabolism following a protein meal was not always associated with a corresponding increase in insensible water loss, in fact in certain experiments the insensible loss did not increase at all when the metabolism increased by as much as 30 per cent.…”

“…It has been found that the insensible weight loss increases above the basal when a patient assumes the sitting position (8), on activity (9, 10), in fever (1), and usually after eating (1,11,12). Jores (11) and Dieckhoff (12), however, found that the increase in metabolism following a protein meal was not always associated with a corresponding increase in insensible water loss, in fact in certain experiments the insensible loss did not increase at all when the metabolism increased by as much as 30 per cent. Furthermore, results of other investigators have revealed that the heat lost by vaporization in sleep (8,9,13) and on activity (7), even when unaccompanied by sensible perspiration, may not bear the same relation to total heat production as obtains under basal conditions.…”

“…Thus, although the percentage of heat lost by vaporization in hyperthyroidism has been studied by several authors, studies in only a few isolated cases of hypothyroidism are reported. The percentage of the total heat lost through vaporization under basal conditions has often been found increased in hyperthyroidism (1,3,4,11), even when no sensible perspiration is discernible; the few available reports in hypothyroidism indicate that the percentage heat lost through vaporization may be less than normal (1,4,9). The purpose of the present investigation was to determine the relationship of insensible water loss to heat production in a group of patients with hypothyroidism.…”