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Deployment and Retrieval of Mineral Samplers
05:52

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Published on: January 20, 2026

Surface contamination artificially elevates initial sweat mineral concentrations.

Matthew R Ely1, Robert W Kenefick, Samuel N Cheuvront

  • 1U.S. Army Research Institute of Environmental Medicine, Kansas St., Bldg. 42, Natick, MA 01760-5007, USA. matthew.ely@us.army.mil

Journal of Applied Physiology (Bethesda, Md. : 1985)
|April 23, 2011
PubMed
Summary
This summary is machine-generated.

Sweat mineral concentrations in arm bags decrease over time due to skin contamination, not changes in body mineral levels. Transdermal fluid and serum mineral levels remained stable during prolonged exercise-heat stress.

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Area of Science:

  • Exercise Physiology
  • Environmental Medicine
  • Human Physiology

Background:

  • Serial sweat sampling often shows declining mineral concentrations.
  • This decline may be due to reduced dermal minerals or surface contamination.
  • Understanding these changes is crucial for accurate physiological monitoring.

Purpose of the Study:

  • To investigate serial changes in mineral concentrations across serum, sweat, and transdermal fluid (TDF) during prolonged exercise-heat stress.
  • To differentiate between true physiological changes and surface contamination effects in sweat samples.
  • To assess the stability of mineral concentrations in different biological compartments under environmental stress.

Main Methods:

  • Sixteen heat-acclimated individuals underwent 3 hours of treadmill exercise in a controlled hot environment.
  • Mineral concentrations (Ca, Cu, Fe, K, Mg, Na, Zn) were measured hourly from serum, upper back sweat (pouch), arm sweat (bag), and TDF.
  • Skin sites were meticulously cleaned before sampling to minimize surface contamination.

Main Results:

  • Transdermal fluid (TDF) mineral concentrations remained largely stable, with minor shifts in iron and zinc.
  • Serum and upper back (pouch) sweat mineral concentrations were also stable over the sampling period.
  • Arm bag sweat initially showed higher concentrations of Ca, Cu, Mg, and Zn, which decreased significantly over time, approaching pouch sweat levels.

Conclusions:

  • Observed declines in arm bag sweat mineral concentrations are primarily attributed to initial skin surface contamination, not physiological depletion.
  • Transdermal fluid (TDF) mineral levels provide a stable reference, unaffected by surface contaminants.
  • Meticulous cleaning may not fully remove all skin surface contaminants, impacting initial sweat sample accuracy.