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Related Concept Videos

Diagnosing Acidosis and Alkalosis01:24

Diagnosing Acidosis and Alkalosis

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Diagnosing acid-base imbalances involves systematically analyzing arterial blood samples, focusing on three key measurements: pH, bicarbonate (HCO3−) concentration, and carbon dioxide partial pressure (PCO2). This analysis follows a four-step process that helps identify the imbalance's underlying cause and nature.
First, the pH level is assessed to determine whether the blood pH is normal (7.35–7.45), low (acidosis), or high (alkalosis).
Next, the PCO2  and...
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Acid-Base Balance01:25

Acid-Base Balance

330
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...
330
Disorders of Acid-Base Balance01:29

Disorders of Acid-Base Balance

176
The human body maintains a precise pH range of arterial blood between 7.35 and 7.45. Deviations result in either acidosis (pH < 7.35) or alkalosis (pH > 7.45). These conditions are further classified as respiratory or metabolic disorders based on their underlying cause.
Respiratory Acidosis and Alkalosis
Respiratory acidosis occurs due to an increase in the partial pressure of carbon dioxide PCO2 in the blood. It often arises from shallow breathing or impaired gas exchange caused by...
176
Respiratory Regulation of Acid-Base Balance01:18

Respiratory Regulation of Acid-Base Balance

358
Respiratory compensation is a vital physiological process that stabilizes blood plasma pH by regulating the partial pressure of carbon dioxide (PCO2), a key determinant of pH levels. Most carbon dioxide in the blood dissolves and converts into carbonic acid (H2CO3). It dissociates into hydrogen ions (H+) and bicarbonate ions (HCO3⁻). There is also an inverse relationship between PCO2​​ and pH.
When carbon dioxide levels increase in the blood, more H+ and HCO3⁻ are...
358
pH Homeostasis01:31

pH Homeostasis

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Acid-base homeostasis is essential for maintaining normal physiological activities in humans. The pH of various body fluids is strictly regulated because it is critical for the optimal activity of enzymes involved in metabolic reactions. Enzymes are basically proteins, so, any significant change in pH can affect their structure and activity. In humans, pH is regulated using three primary mechanisms— chemical buffer systems, respiratory regulation, and renal regulation.
Respiratory...
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Titration of a Weak Acid with a Strong Base01:30

Titration of a Weak Acid with a Strong Base

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In titrating a weak acid with a strong base, different calculation methods are applied at various stages. Initially, the pH of a weak acid like acetic acid is calculated using its dissociation constant (Ka) and an ICE table. Upon addition of a strong base such as sodium hydroxide, a buffer forms, and its pH is determined using the Henderson-Hasselbalch equation. As more base is added and the titration reaches the halfway point, the pH becomes equal to the pKa of the acid, indicating equal...
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Exploring the Influence of Acid-Base Status on Athletic Performance during Simulated Three-Day 400 m Race.

François Chiron1,2, Mégane Erblang1, Bora Gulören1

  • 1Exercise Biology for Performance and Health Laboratory (LBEPS), Univ Evry, IRBA, University Paris Saclay, 91025 Evry, France.

Nutrients
|July 13, 2024
PubMed
Summary

Highly trained athletes can maintain peak performance over three days. An alkaline diet with bicarbonate-rich water improved 400m race performance by enhancing buffering capacity and lactate clearance.

Keywords:
anaerobic performancehigh-intensity exercisenutritional strategysodium bicarbonate supplementation

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Area of Science:

  • Sports Science
  • Exercise Physiology
  • Nutritional Biochemistry

Background:

  • Elite athletes face challenges maintaining peak performance during multi-day competitions.
  • Metabolic acidosis and neuromuscular fatigue can impair athletic performance.
  • Alkaline diets and bicarbonate supplementation are explored for ergogenic effects.

Purpose of the Study:

  • To assess highly trained athletes' ability to sustain high-level performance across three consecutive 400m races.
  • To investigate the impact of an alkaline diet with bicarbonate-rich water versus placebo on metabolic responses and fatigue markers.
  • To examine the influence of diet and hydration on acid-base balance and performance during intense, repeated exercise.

Main Methods:

  • Twenty-two elite athletes were divided into placebo (PLA) and bicarbonate (BIC) groups, both on an alkalizing diet.
  • Participants completed a simulated 400m race daily for three consecutive days.
  • Performance, acid-base balance (urinary pH, Potential Renal Acid Load - PRAL), blood lactate, and fatigue markers were measured pre- and post-race.

Main Results:

  • The combination of an alkalizing diet and bicarbonate-rich water significantly altered acid-base status (p < 0.05).
  • Athletes in both groups maintained performance across the three races without increased fatigue markers (PLA group).
  • Lactate clearance improved after the third race (p < 0.05), and the BIC group showed enhanced performance in the final race (p < 0.01).

Conclusions:

  • Highly trained athletes can replicate high-level performance over three consecutive days despite significant metabolic disturbances.
  • An alkaline diet coupled with bicarbonate-rich water consumption can enhance buffering capacity and improve performance in repeated 400m races.
  • Ecological nutritional strategies, including diet and hydration, play a crucial role in optimizing athletic performance during demanding competition schedules.