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Cited by 57Thermoregulation and physiological responsesSodium Intake and HealthExercise and Physiological Responses

Effects of dietary sodium on body and muscle potassium content during heat acclimation

Armstrong, Lawrence E., Costill, David L., Fink, William J., Bassett, David, Hargreaves, Mark, Nishibata, Izumi, King, Douglas S.·1985·European Journal of Applied Physiology and Occupational Physiology
DOI 10.1007/bf02337183
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Abstract

It has been suggested that renal conversion of sodium (Na+) during training in hot environments results in potassium (K+) deficiencies. This investigation examined the influence of two levels of dietary Na+ intake (399 vs 98 mmol X d-1) on intramuscular, urinary, sweat, and whole body K+ homeostasis. Nine unacclimated, untrained males underwent heat acclimation during two 8 day dietary-exercise regimens (40.1 +/- 0.1 degrees C, 23.5 +/- 0.4% RH). Both diets resulted in depressed urinary K+ excretion. Sweat K+ and muscle K+ concentrations were not altered by diets or acclimation. The whole body stores of Na+ increased 31.1% (+916.8 mmol) during the high Na+ diet and decreased 7.8% (-230.4 mmol) during the low Na+ diet; whole body stores of K+ increased 4.1% (+137.6 mmol) during the high Na+ diet and increased 3.4% (+113.6 mmol) during the low Na+ diet. This dietary-acclimation protocol did not result in whole-body or intramuscular K+ deficits and offers no evidence to support previous claims that dietary sodium levels affect K+ balance.

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  • Most but not all studies have shown that dietary Na+ restriction is associated with a decrease in sweat [Na+] and [Cl−].

    “In brief, most (Allsopp et al. 1998; Armstrong et al. 1985a; Braconnier et al. 2019; Costa et al. 1969; Hargreaves et al. 1989; Komives et al. 1966; McCance 1938; McCubbin et al. 2019; Sigal and Dobson 1968; Weiner and Van Heyningen 1952) but not all (Costill et al. 1975; Koenders et al. 2017; Konikoff et al. 1986; Robinson et al. 1956) studies have shown that dietary Na+ restriction is associated”

    From Physiological mechanisms determining eccrine sweat composition (2020) · cites this paper as Armstrong et al. 1985a

  • Studies have found no change or a marginal increase in sweat [Na+] and [Cl−] when salt intake is sufficient to replace sweat electrolyte losses incurred during the heat acclimation protocol.

    “Studies have found no change or a marginal increase in sweat [Na+] and [Cl−] when salt intake is sufficient to replace sweat electrolyte losses incurred during the heat acclimation protocol, (Armstrong et al. 1985a; Eichner 2008; McCance 1938; Weiner and Van Heyningen 1952).”

    From Physiological mechanisms determining eccrine sweat composition (2020) · cites this paper as Armstrong et al. 1985a

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Authors
Armstrong, L. E., Costill, D. L., Fink, W. J., Bassett, D., Hargreaves, M., Nishibata, I., & King, D. S.
Affiliations
Ball State University (US)
ORCID
Venue
European Journal of Applied Physiology and Occupational Physiology
Publisher
Springer Science and Business Media LLC
Published
1985-10
Volume
54
Issue
4
Pages
391-397
ISSN
  • 0020-9376 (ISSN-L)
  • 0301-5548
  • 1439-6327
DOI
10.1007/bf02337183
OpenAlex
W2040270287
Cited by
57
References
29
Citations by year
2025: 2 · 2023: 1 · 2022: 1 · 2021: 2 · 2020: 3 · 2019: 6 · 2018: 2 · 2017: 3 · 2014: 3 · 2013: 1
FWCI
1.95
Type
journal article
Language
en
Open access
closed
Licence
www.springer.com/tdm (tdm)
Locations
  • European Journal of Applied Physiology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Health Sciences › Medicine › Physiology › Thermoregulation and physiological responses
  • Health Sciences › Nursing › Nutrition and Dietetics › Sodium Intake and Health
  • Health Sciences › Medicine › Rehabilitation › Exercise and Physiological Responses
Keywords
dietary sodium, potassium homeostasis, heat acclimation, potassium excretion, sweat potassium, sodium balance, sodium-potassium balance
MeSH terms
Acclimatization, Adult, Body Temperature, Body Weight, Diet, Diuresis, Physical Exertion, Heart Rate, Hot Temperature, Humans, Male, Muscles, Plasma Volume, Potassium, Sodium, Sweat, Sweating

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