A simple field test for assessing salt balance in heat-stressed miners.
A simple colorimetric test for urinary chloride (Fantus test) corrected for urine specific gravity (measured by refractometry) enabled 24-hour urinary sodium excretion rates to be predicted accurately from a single spot sample of urine. In 29 acclimatized miners working in an environment in excess of 40 degrees C, salt-conserving mechanisms, involving renin and aldosterone, were not active until the urinary sodium excretion rate fell below 50 mmol/24 h. A predicted sodium excretion rate greater than 50 mmol/24 h indicates that dietary sodium supplementation is not necessary.
Department of Physiology and Pharmacology, University of Queensland, St Lucia, Australia.
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Cross
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Galton-Fenzi
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Jordan
D000328:Adult; D005069:Evaluation Studies as Topic; D005260:Female; D006358:Hot Temperature / Q000009:adverse effects*; D006801:Humans; D008297:Male; D008906:Mining; D009318:Natriuresis; D009784:Occupational Diseases / Q000175:diagnosis / Q000378:metabolism*; D012982:Sodium, Dietary / Q000008:administration & dosage; D013312:Stress, Physiological / Q000175:diagnosis / Q000378:metabolism*; D014882:Water-Electrolyte Balance
D012982:Sodium, Dietary