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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...
Alterations in Blood Pressure01:30

Alterations in Blood Pressure

Alterations in blood pressure, such as hypertension (high blood pressure) and hypotension (low blood pressure), significantly affect human health. Understanding these conditions' classifications, causes, and symptoms is essential for effective management and treatment.
Hypertension (High blood pressure)
Hypertension occurs when blood pressure readings consistently exceed the normal range. It is diagnosed when systolic blood pressure (the top number, indicating pressure while the heart beats)...
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...
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...
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...
Acid-Base Balance01:25

Acid-Base Balance

The human body maintains a narrow pH range regulated through acid-base balance. This balance is crucial as changes in the hydrogen ion concentration can disrupt cell membrane stability, alter protein structures, and change enzyme activities. The normal pH of arterial blood is 7.4, venous blood and interstitial fluid is 7.35, and intracellular fluid averages 7.0.
When the pH of arterial blood rises above 7.45, it results in a condition called alkalosis. Conversely, a drop below 7.35 leads to...

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Related Experiment Video

Updated: May 16, 2026

Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test
10:21

Evaluation of Hydration Status by Bioelectrical Impedance Vector Analysis in Patients with Ischemic Heart Disease Undergoing Exercise Stress Test

Published on: September 22, 2023

Hypohydration does not alter standing balance.

Joseph F Seay1, Brett R Ely, Robert W Kenefick

  • 1U.S. Army Research Institute of Environmental Medicine, Natick, MA, USA.

Motor Control
|November 17, 2012
PubMed
Summary
This summary is machine-generated.

This study found that mild dehydration does not significantly impact standing balance in healthy individuals. While some minor sway changes occurred with eyes closed, they lacked practical significance.

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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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Published on: March 21, 2013

Area of Science:

  • Exercise Physiology
  • Human Physiology
  • Sports Science

Background:

  • Body water deficits can arise from dehydration, impacting physiological functions.
  • Understanding the effects of hypohydration on balance is crucial for athletes and military personnel.
  • Previous research has yielded mixed results regarding dehydration's impact on postural control.

Purpose of the Study:

  • To investigate the effects of body water deficits on standing balance.
  • To determine if plasma hyperosmolality and/or plasma volume reduction independently affect balance.
  • To assess the practical significance of observed balance changes during hypohydration.

Main Methods:

  • Nine healthy volunteers participated in euhydration and hypohydration trials.
  • Hypohydration was induced via exercise-heat stress (3-5% body mass loss) and diuretics (3% body mass loss).
  • Standing balance was measured using a force platform during quiet standing with eyes open and closed.

Main Results:

  • Hypohydration led to a significant decrease in medial-lateral sway path and velocity (13%) when eyes were closed.
  • However, these changes were within the normal variation of euhydration measures, indicating limited practical importance.
  • No significant associations were found between plasma volume loss or increased plasma osmolality and changes in balance.

Conclusions:

  • Standing balance in healthy individuals is not practically altered by mild to moderate hypohydration.
  • Neither plasma hyperosmolality nor plasma volume reduction appear to be primary drivers of balance changes during hypohydration.
  • Further research may explore the effects of more severe dehydration or specific populations.