CSSD Hydration Strategies 3

Question 1

Which fluid is most effective for rapid rehydration after a 90-minute soccer match where ~2% body weight was lost?

Accepted Answer

Oral rehydration solution (ORS) with sodium and glucose at 150% of losses

Answer

An ORS providing sodium and glucose at 150% of fluid losses accelerates rehydration by retaining more fluid and replacing electrolytes.

Question 2

During a 4-hour ultramarathon, an athlete's serum sodium drops to 128 mEq/L with no symptoms. According to current guidelines, what is the appropriate intervention?

Accepted Answer

Fluid restriction and sodium-rich foods until symptoms resolve or sodium normalizes

Answer

Asymptomatic EAH is managed conservatively with fluid restriction and sodium replacement; IV fluids are reserved for symptomatic cases with altered mental status.

Question 3

Which hormone plays the primary role in regulating water reabsorption in the kidneys during exercise-induced dehydration?

Accepted Answer

Antidiuretic hormone (ADH/vasopressin)

Answer

ADH is released from the posterior pituitary in response to increased plasma osmolality, promoting water reabsorption in the collecting ducts.

Question 4

A CSSD recommends glycerol hyperhydration to a cyclist before a 3-hour road race in the heat. What is the primary physiological rationale?

Accepted Answer

Glycerol acts as an osmotic agent, expanding plasma and total body water

Answer

Glycerol is an osmotically active substance that, when co-ingested with fluid, promotes water retention and expands plasma volume before exercise.

Question 5

How should a CSSD calculate an athlete's individualized fluid intake target during exercise?

Accepted Answer

Based on sweat rate testing: fluid intake ≈ sweat rate − acceptable deficit (no more than 2% BW)

Answer

Individualized fluid targets are based on measured sweat rate, with intake adjusted to prevent losses exceeding 2% body weight while avoiding overdrinking.

(CSSD) Board Certified Specialist in Sports Dietetics Practice Test

(CSSD) Board Certified Specialist in Sports Dietetics Practice Test

CSSD Hydration Strategies 3