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Related Concept Videos

Disorder of Water Balance01:29

Disorder of Water Balance

Water balance disorders are medical conditions that occur when there is a deviation from the body's water volume or osmolarity, disrupting normal homeostasis and leading todehydration, hypotonic hydration, hyperhydration, edema, or water intoxication.
Dehydration
Dehydration occurs when the body loses fluids (particularly water).
Causes:
The major causes of dehydration include excessive sweating, fever, vomiting, diarrhea, and diuresis.
Signs and Symptoms:
Symptoms primarily include intense...
Regulation of Water Intake01:25

Regulation of Water Intake

Osmolality refers to the number of solute particles per kilogram of solvent in a solution. Plasma osmolality specifically indicates the total number of solute particles per kilogram of water in blood plasma. This value reflects the body's hydration status and is tightly regulated through mechanisms controlling water intake and output. While water consumption is a conscious decision, the body has intrinsic regulatory systems to maintain fluid balance. Dehydration, a state of water deficit...
Primary Motives: Hunger and Thirst01:25

Primary Motives: Hunger and Thirst

Hunger and thirst are fundamental physiological drives crucial for maintaining homeostasis and ensuring the survival of both humans and animals. These drives are regulated through complex interactions between the brain, hormones, and sensory receptors.
Hunger arises when the brain detects changes in the body's nutrient levels, including glucose, lipids, amino acids, and hormones such as ghrelin and leptin. The hypothalamus plays a central role in hunger regulation. The lateral hypothalamus acts...
Diabetes Insipidus II: Pathophysiology01:22

Diabetes Insipidus II: Pathophysiology

Normally, water balance is maintained through three interconnected mechanisms: the hypothalamic thirst center, the synthesis and release of antidiuretic hormone (ADH, or vasopressin), and the kidneys' responsiveness to this hormone. ADH is synthesized in the hypothalamus, released from the posterior pituitary, and acts on the distal nephron, allowing water reabsorption and concentrated urine production.Diabetes Insipidus and Its TypesIn diabetes insipidus (DI), this regulatory system is...
Physiology of the Genitourinary System III: Urine Concentration and Dilution01:20

Physiology of the Genitourinary System III: Urine Concentration and Dilution

The kidneys concentrate or dilute urine to maintain water and electrolyte balance. Nephrons, particularly the loop of Henle, play a crucial role in this process through the countercurrent multiplication system. This system establishes a high osmolarity in the renal medulla, which is essential for water reabsorption. In the loop of Henle’s descending limb, water is reabsorbed into the surrounding medulla due to its permeability to water. In contrast, the ascending limb actively transports...
Regulation of Water Output01:26

Regulation of Water Output

The human body predominantly expels water through the urinary system. On average, an individual generates around 1.5 liters of urine each day. This amount can fluctuate based on how well a person is hydrated, but a critical minimum quantity of urine must be produced to ensure the body's proper functioning. Daily, the kidneys remove 600 to 1200 milliosmoles of dissolved substances, effectively excreting excess minerals and water-soluble toxins such as creatinine, urea, and uric acid from the...

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Updated: May 14, 2026

Evaluation of Fluid Overload by Bioelectrical Impedance Vectorial Analysis
07:17

Evaluation of Fluid Overload by Bioelectrical Impedance Vectorial Analysis

Published on: August 17, 2022

Physiologic basis for understanding quantitative dehydration assessment.

Samuel N Cheuvront1, Robert W Kenefick, Nisha Charkoudian

  • 1US Army Research Institute of Environmental Medicine, Natick, MA, USA. samuel.n.cheuvront@us.army.mil

The American Journal of Clinical Nutrition
|January 25, 2013
PubMed
Summary
This summary is machine-generated.

Assessing body water deficit (dehydration) is challenging due to lack of a universal standard. This review links dehydration physiology and its observable effects, offering practical assessment methods.

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Last Updated: May 14, 2026

Evaluation of Fluid Overload by Bioelectrical Impedance Vectorial Analysis
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Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test
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Area of Science:

  • Physiology
  • Human Health
  • Performance Science

Background:

  • Dehydration, a state of body water deficit, significantly impacts health and performance.
  • Accurate dehydration assessment is difficult, lacking a universal gold standard for clinical decision-making.

Purpose of the Study:

  • To review the physiological basis for quantitative dehydration assessment.
  • To link the physiology and observable effects (phenomenology) of dehydration.
  • To provide practical measures for improving dehydration assessment.

Main Methods:

  • Review of physiological mechanisms underlying dehydration.
  • Analysis of osmotic and blood volume-dependent compensatory responses.
  • Examination of biological variation in osmotic responses.

Main Results:

  • Dehydration assessment depends on type (dehydration vs. volume depletion) and severity.
  • Individual variations in osmotic responses influence dehydration's physiological and phenomenological aspects.
  • Empirical thresholds offer a starting point for quantitative assessment.

Conclusions:

  • Understanding physiological variations is key to accurate dehydration assessment.
  • Quantitative methods can bridge the gap between dehydration physiology and clinical observation.
  • Practical guidelines are proposed to enhance dehydration assessment practices.