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Document ID (ISN)50778
CIS number 88-2084
ISSN - Serial title Japanese Journal of Public Health
Year 1987
Convention or series no.
Author(s) Iso H., Sato S., Fukuuchi K., Doi M., Shimamoto T., Komachi Y.
Title Appropriateness of salt intake recommendations for preventing circulatory disorders in persons working at high temperatures
Original title Junkanki shikkan taisaku no tame no kōonka sagyō jūjisha ni taisuru gen'en shidō no datōsei ni kansuru kentō [in Japanese]
Bibliographic information Aug. 1987, Vol.34, No.8, p.413-419. Illus. 13 ref.
Abstract To reduce the incidence of circulatory disorders in Japan, reductions in dietary salt intake to 10g/day or less have been recommended. To determine the validity of this recommendation for persons working at high temperatures, 7 subjects engaged in greenhouse labour were studied. The amount of perspiration during farming work in greenhouses was 0.7 - 3.0L/day. This amount was proportional to the net working time spent in the greenhouse. Two methods were used for estimating the amount of salt lost in perspiration. From the measured volumes of perspiration and previously published estimates of salt concentration in perspiration, the range of salt lost in perspiration was estimated to be 2 - 9g/day. The amount of salt lost in perspiration was 2 - 8g/day when calculated by subtraction of 24hr urinary salt excretion from 24-hr oral salt intake. Under the extreme conditions of watermelon pollination, which included 6h of work in greenhouses for one subject, the amount of perspiration was 3L/day, with an estimated maximum salt loss of 8 - 9g. Salt intake should be limited to 10g/day or less even for healthy farm labourers working under extreme conditions.
Descriptors (primary) Japan; electrolyte requirements; horticulture; work at high temperature; diet
Descriptors (secondary) dehydration; sodium chloride
Document type D - Periodical articles
Subject(s) Occupational physiology
Broad subject area(s) Physiology, ergonomics
Browse category(ies) Agriculture
Nutrition