Hydration and Electrolyte Balance in Exercise

Flashcards encompassing key concepts about hydration, electrolytes, and their impact on exercise performance.

Electrolyte

Charged minerals such as sodium (Na⁺), potassium (K⁺), chloride (Cl⁻), calcium (Ca²⁺), and magnesium (Mg²⁺) that are essential for various bodily functions.

Hyponatremia

A condition caused by excess water intake without electrolytes, leading to low sodium levels, with symptoms including nausea, bloating, confusion, and seizures.

Hypernatremia

A condition caused by insufficient water relative to sodium intake or loss, leading to high sodium levels, with symptoms such as thirst, irritability, and seizures.

Dehydration

A reduction in blood plasma volume that affects stroke volume (SV) and cardiac output (Q), resulting in increased heart rate (HR) and decreased thermoregulation.

Sodium (Na⁺)

An essential electrolyte involved in fluid balance, nerve transmission, and muscle contraction; major component lost in sweat.

Potassium (K⁺)

An electrolyte critical for muscle contraction, cardiac rhythm, and proper nerve function.

Calcium (Ca²⁺)

An electrolyte important for muscle relaxation, ATP production, and enzyme function.

Magnesium (Mg²⁺)

An electrolyte that is vital for muscle relaxation, ATP production, and enzyme activity.

Thermoregulation

The process by which the body maintains its internal temperature through mechanisms like sweating and fluid balance.

CV Drift

Cardiovascular drift is the phenomenon of increased heart rate and decreased stroke volume during prolonged exercise due to dehydration.

Concentration of Urine

A method to assess hydration status; more dilute urine indicates good hydration, while concentrated urine suggests dehydration.

Ways to monitor hydration

Methods include monitoring urine output, thirst levels, and body weight changes during prolonged exercise.

Fluid Loss Mechanisms

Includes sweating, respiratory loss, urine excretion, and fecal loss, which all contribute to the need for hydration.

Functions of Water

Water helps maintain blood volume, regulate temperature, support muscle contraction, enable enzymatic reactions, and prevent fatigue.

Electrolyte-rich foods

Foods like fruits, vegetables, and dairy that help replenish electrolytes lost during exercise.

Importance of Sports Drinks

Sports drinks provide both hydration and electrolyte replacement, aiding in recovery more effectively than water alone.