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Fluid-electrolyte losses in uniforms during prolonged exercise at 30 degrees C.
Aviat Space Environ Med. 1992 May; 63(5):351-5.AS

Abstract

The effects of several uniform configurations on fluid and electrolyte losses in a hot environment (30 degrees C db, 18 degrees C wb) were studied in 15 healthy males, during 6 h of intermittent treadmill exercise (1.56 m.s-1, 0% grade, 50 min.h-1, 28 km total distance). The uniforms were: the temperate battle dress uniform (BDU), two variants (C and F) of full military oriented protective posture (MOPP IV), and MOPP IV with no mask or hood (M). Sweat rate, urine volume, electrolyte losses (Na+, Cl-, K+, Mg++, Ca++) in sweat and urine, rectal temperature, mean skin temperature, heart rate, and temperature/humidity inside uniforms were measured. Observations indicated that both MOPP IV configurations (C and F) resulted in significantly greater (p. less than 0.05) fluid losses and physiological strain than BDU and M. However, there were no between-uniform differences in the total loss of any electrolyte. Total body fluid losses (kg.6h-1) and electrolyte losses in sweat (mEq.6h-1) were consistently greater than in urine. It was concluded that 6 h of exercise in uniforms at 30 degrees C can result in losses of Na+ and Ca++ which exceed the normal daily intake of these electrolytes. Supplementation of fluid, Na+, and Ca++ appears to be warranted when scenarios require 6 h or more of uniformed exposure to heat.

Authors+Show Affiliations

U.S. Army Research Institute of Environmental Medicine, Heat Research Division, Natick, MA.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

1599380

Citation

Armstrong, L E., et al. "Fluid-electrolyte Losses in Uniforms During Prolonged Exercise at 30 Degrees C." Aviation, Space, and Environmental Medicine, vol. 63, no. 5, 1992, pp. 351-5.
Armstrong LE, Szlyk PC, De Luca JP, et al. Fluid-electrolyte losses in uniforms during prolonged exercise at 30 degrees C. Aviat Space Environ Med. 1992;63(5):351-5.
Armstrong, L. E., Szlyk, P. C., De Luca, J. P., Sils, I. V., & Hubbard, R. W. (1992). Fluid-electrolyte losses in uniforms during prolonged exercise at 30 degrees C. Aviation, Space, and Environmental Medicine, 63(5), 351-5.
Armstrong LE, et al. Fluid-electrolyte Losses in Uniforms During Prolonged Exercise at 30 Degrees C. Aviat Space Environ Med. 1992;63(5):351-5. PubMed PMID: 1599380.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Fluid-electrolyte losses in uniforms during prolonged exercise at 30 degrees C. AU - Armstrong,L E, AU - Szlyk,P C, AU - De Luca,J P, AU - Sils,I V, AU - Hubbard,R W, PY - 1992/5/1/pubmed PY - 1992/5/1/medline PY - 1992/5/1/entrez SP - 351 EP - 5 JF - Aviation, space, and environmental medicine JO - Aviat Space Environ Med VL - 63 IS - 5 N2 - The effects of several uniform configurations on fluid and electrolyte losses in a hot environment (30 degrees C db, 18 degrees C wb) were studied in 15 healthy males, during 6 h of intermittent treadmill exercise (1.56 m.s-1, 0% grade, 50 min.h-1, 28 km total distance). The uniforms were: the temperate battle dress uniform (BDU), two variants (C and F) of full military oriented protective posture (MOPP IV), and MOPP IV with no mask or hood (M). Sweat rate, urine volume, electrolyte losses (Na+, Cl-, K+, Mg++, Ca++) in sweat and urine, rectal temperature, mean skin temperature, heart rate, and temperature/humidity inside uniforms were measured. Observations indicated that both MOPP IV configurations (C and F) resulted in significantly greater (p. less than 0.05) fluid losses and physiological strain than BDU and M. However, there were no between-uniform differences in the total loss of any electrolyte. Total body fluid losses (kg.6h-1) and electrolyte losses in sweat (mEq.6h-1) were consistently greater than in urine. It was concluded that 6 h of exercise in uniforms at 30 degrees C can result in losses of Na+ and Ca++ which exceed the normal daily intake of these electrolytes. Supplementation of fluid, Na+, and Ca++ appears to be warranted when scenarios require 6 h or more of uniformed exposure to heat. SN - 0095-6562 UR - https://www.unboundmedicine.com/medline/citation/1599380/Fluid_electrolyte_losses_in_uniforms_during_prolonged_exercise_at_30_degrees_C_ L2 - https://medlineplus.gov/exerciseandphysicalfitness.html DB - PRIME DP - Unbound Medicine ER -