Biochemical Foundations of Human Life Activity - Volkov, N. I., Nesen, E. N. 2000

Biochemical Foundations of Human Life Activity
Water and Mineral Metabolism
Mineral Metabolism During Muscular Activity

Intensive muscular activity causes alterations in the body's mineral balance. High training and competitive loads typical of modern sports disrupt athletes' mineral Homeostasis, which can ultimately limit physical performance.

Shifts in an athlete's mineral balance depend on the specific sport, their skill level, and environmental conditions, and are closely linked to Water METABOLISM. During short-term physical exertion, the levels of certain minerals in the body drop by only 5—7 %, which has no significant impact on Muscle Function—especially since physical activity triggers a redistribution of minerals between actively working Tissues (Muscles) and inactive tissues. Substantial disruptions in Mineral Metabolism occur in endurance athletes. Due to heavy sweating, plasma concentrations of sodium, potassium, and chloride decrease. During anaerobic exercise, athletes lose significant amounts of phosphorus, as much of it cannot be utilized quickly enough for ATP resynthesis and is excreted from the body.

Ambient Temperature significantly affects mineral metabolism. In hot environments, training and competition lead to substantial mineral losses. For instance, during prolonged exertion (up to 3—4 hours), Blood sodium concentration can drop to 112 mmol ∙ l^-1 (compared to a normal level of about 140 mmol ∙ l^-1).

Losses of sodium, potassium, chloride, and other elements must be replenished during and after exercise. If daily fluid losses do not exceed 3 % of body weight, electrolyte deficits can typically be covered by dietary minerals. However, if fluid losses exceed 8 % of body weight per day, specialized supplements and beverages containing these substances should be consumed.

Compensating for Water and Electrolyte losses during prolonged exertion across various sports must be done in a timely manner to prevent a drop in their plasma concentrations.

The primary cause of mineral deficiencies in athletes is inadequate Nutrition. Nevertheless, simply supplementing with minerals against the backdrop of an already balanced diet does not lead to any significant boost in physical performance.

Review Questions

1. What is the Biological Role of water in the body?

2. How is water distributed throughout the body?

3. Name the different states of water in the body and explain their significance.

4. What is meant by water balance, and how is it maintained?

5. What are Hydration and dehydration?

6. How does water metabolism change during muscular activity?

7. How does dehydration affect physical performance?

8. What signals The Need for fluid replenishment, and how can the required amount be determined?

9. What are the mechanisms regulating water metabolism?

10. What is the human requirement for minerals?

11. What body cations and anions, as well as complex compounds containing Trace Elements, do you know?

12. Name the key minerals involved in Muscle contraction, Bone Formation, energy supply, and the functioning of The Nervous system.

13. Which minerals are essential for hematopoiesis (blood formation)?

14. Which minerals are necessary for the synthesis of Hormones and Enzymes?

15. Which minerals exhibit antioxidant activity, and how is it manifested?

16. What changes in mineral balance occur under various types of physical exertion, and how do these changes affect physical performance?