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Body Water Content and Fluid Compartments01:19

Body Water Content and Fluid Compartments

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Life's biochemical processes occur within aqueous solutions. Solutes are substances that are dissolved within these solutions. The human body contains a variety of solutes, which can differ across various body parts. These can encompass proteins—such as those responsible for clotting and carbohydrate transport—as well as electrolytes. In medicine, an electrolyte is often described as a mineral ion derived from a salt possessing an electric charge. Examples include sodium ions...
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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
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Causes:
The major causes of dehydration include excessive sweating, fever, vomiting, diarrhea, and diuresis.
Signs and Symptoms:
Symptoms primarily include intense...
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Composition of Body Fluids01:29

Composition of Body Fluids

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Water functions as a solvent accommodating various solutes, which can be categorized under electrolytes and non-electrolytes. Non-electrolytes are usually held together by covalent bonds, restricting them from dissociating in solution, thereby leading to a lack of electrically charged components upon dissolving in water. They are predominantly organic molecules, such as glucose, creatinine, and urea. Electrolytes, on the other hand, are compounds that can break down into ions in water.
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Regulation of Water Intake01:25

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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...
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Fluid Movement Between Compartments01:18

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The force applied by fluids against a surface, known as hydrostatic pressure, initiates the transfer of fluid among different compartments. Within our blood vessels, the blood's hydrostatic pressure is a result of the heart's pumping action. At the arteriolar end of capillaries, hydrostatic pressure (capillary blood pressure) exceeds the opposing colloid osmotic pressure created primarily by plasma proteins like albumin. This discrepancy in pressure propels plasma and nutrients from the...
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The heart's primary function is to pump blood throughout the body, maintaining a balance between blood sent out (cardiac output) and blood returning (venous return). If this balance is disrupted, it can result in congestive heart failure (CHF), a severe condition where the heart becomes an inefficient pump, leading to inadequate blood circulation.
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Evaluation of Fluid Overload by Bioelectrical Impedance Vectorial Analysis
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Fluid Balance in Surfers: A Scoping Review.

James Furness1, Marie Troja1, Abigail Brandon1

  • 1Bond Institute of Health and Sport, Faculty of Health Sciences and Medicine, Physiotherapy Department, Bond University, Robina, QLD 4226, Australia.

Sports (Basel, Switzerland)
|February 26, 2026
PubMed
Summary
This summary is machine-generated.

Surfing causes unique fluid losses, with wetsuit-wearing surfers experiencing greater body mass loss. Elite surfers face high fluid losses that may impair performance, highlighting the need for more research on hydration strategies.

Keywords:
dehydrationfluid losshydration statuswater sportswetsuits

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Area of Science:

  • Sports Science
  • Environmental Physiology
  • Exercise Physiology

Background:

  • Surfing involves unique hydration challenges due to semi-submerged conditions and varied apparel.
  • Direct sweat loss measurement in surfers is difficult, complicating fluid balance assessment.

Purpose of the Study:

  • To systematically review and identify factors influencing fluid balance in surfing participants.
  • To assess the quality of existing research on fluid loss in surfing.

Main Methods:

  • A systematic scoping review of nine databases was conducted.
  • Seven studies, including five cross-sectional and two randomized controlled trials, met the inclusion criteria.

Main Results:

  • Overall fluid loss averaged 0.57 L/h with 1.3% body mass loss.
  • Surfers in wetsuits showed greater body mass loss (1.05% vs. 0.59%).
  • Elite surfers in wetsuits reported high fluid losses (1.68 L/h) and significant body mass loss (3.9%).

Conclusions:

  • Fluid losses in surfers are generally lower than land-based athletes, but elite surfers experience significant losses.
  • Current research quality on surfer fluid loss is poor.
  • Further investigation is crucial for developing evidence-based hydration guidelines for surfers across different conditions and apparel.