CSN Hydration & Fluid Balance

Question 1

Which electrolyte is lost in the greatest concentration through sweat and must be prioritized in a sports hydration plan?

Accepted Answer

Sodium

Answer

Potassium

Answer

Magnesium

Answer

Calcium

Question 2

A urine specific gravity of 1.020–1.030 in an athlete prior to competition most likely indicates:

Accepted Answer

Mild dehydration

Answer

Optimal hydration

Answer

Severe dehydration

Answer

Overhydration

Question 3

At what level of body weight loss from sweat does aerobic exercise performance begin to measurably decline?

Accepted Answer

2%

Answer

1%

Answer

4%

Answer

6%

Question 4

Which of the following best describes the condition of hyponatremia in athletes?

Accepted Answer

Low blood sodium typically caused by excessive plain water intake during prolonged exercise

Answer

Elevated blood sodium due to excessive salt intake

Answer

Sodium depletion from insufficient dietary salt

Answer

An electrolyte imbalance caused by potassium excess

Question 5

According to ACSM guidelines, how much fluid should an athlete consume in the 2–4 hours before exercise to ensure pre-hydration?

Accepted Answer

5–7 mL per kg of body weight

Answer

2–3 oz per pound of body weight

Answer

500–1,000 mL as a flat dose

Answer

16 oz immediately before activity

Question 6

An athlete's sweat rate is best estimated using which method?

Accepted Answer

Measuring body weight before and after exercise accounting for fluid intake and urine output

Answer

Counting perceived thirst episodes per hour

Answer

Calculating total fluid consumed during exercise divided by exercise time

Answer

Using heart rate variability as a proxy for fluid loss

Question 7

Which urine color on the urine color chart (1–8 scale) is generally considered to indicate adequate hydration for athletes?

Accepted Answer

Colors 1–3 (pale yellow to light yellow)

Answer

Color 1 (nearly clear)

Answer

Colors 4–5 (yellow to dark yellow)

Answer

Colors 6–8 (amber to brown)