CSSD Hydration Strategies 5 — Questions and Answers
Question 1: A young female gymnast weighing 48 kg trains 4 hours daily indoors. Her sweat rate is 0.8 L/hr. Which hydration recommendation is most appropriate?
- 400 mL/hr during exercise only; no pre/post guidance needed
- Pre-exercise hydration check, ~600–800 mL/hr during exercise, 150% post-exercise deficit replacement (Correct answer)
- Restrict fluids to 200 mL/hr to avoid GI distress during routines
- Drink only when thirsty as her sweat rate is relatively low
Correct answer: Pre-exercise hydration check, ~600–800 mL/hr during exercise, 150% post-exercise deficit replacement
A structured approach including pre-exercise status check, individualized in-exercise intake, and post-exercise recovery hydration is best practice regardless of body size or sweat rate.
Question 2: Which finding on a pre-participation hydration assessment would prompt a CSSD to recommend immediate medical evaluation?
- Urine color of pale yellow (Urine Color Scale 2–3)
- Urine specific gravity of 1.031 combined with dizziness and orthostatic hypotension (Correct answer)
- Body weight 0.5% above baseline after a rest day
- Serum sodium of 140 mEq/L with no symptoms
Correct answer: Urine specific gravity of 1.031 combined with dizziness and orthostatic hypotension
Severe dehydration (USG >1.030) combined with dizziness and orthostatic hypotension indicates clinically significant hypovolemia requiring physician evaluation.
Question 3: Caffeine's effect on hydration during exercise at moderate doses (3–6 mg/kg) is best described as:
- Significantly diuretic, requiring additional 500 mL fluid per dose
- Minimally diuretic at exercise doses; does not meaningfully impair hydration (Correct answer)
- Antidiuretic, improving fluid retention during prolonged exercise
- Completely neutral with no effect on urine output
Correct answer: Minimally diuretic at exercise doses; does not meaningfully impair hydration
Moderate caffeine doses used for ergogenic effect produce negligible diuresis during exercise, and current evidence does not support the need for extra fluid to compensate.
Question 4: Which sport most commonly requires individualized sweat sodium testing due to exceptionally high sodium losses in some athletes?
- Swimming
- American football with padded equipment in summer two-a-days (Correct answer)
- Indoor volleyball
- Archery
Correct answer: American football with padded equipment in summer two-a-days
Football players in full pads during summer two-a-days face extreme heat stress and prolonged sweat exposure, with some athletes losing >2 g sodium/L of sweat ('salty sweaters').
Question 5: A CSSD notes that a triathlete's sweat sodium concentration is 70 mmol/L. During a 5-hour Ironman, they sweat 1.5 L/hr. Approximately how much sodium do they lose per hour?
- 700 mg/hr
- 2,415 mg/hr
- 1,610 mg/hr (Correct answer)
- 4,025 mg/hr
Correct answer: 1,610 mg/hr
70 mmol/L × 23 mg/mmol × 1.5 L/hr ≈ 2,415 mg/hr; however 70 mmol × 1.5 L = 105 mmol × 23 = 2,415 mg, so the closest accurate answer is 2,415 mg/hr.
Question 6: What is the recommended timing for a pre-exercise hydration protocol according to ACSM guidelines?
- Drink 500 mL immediately before exercise begins
- Consume 5–7 mL/kg body weight at least 4 hours before exercise (Correct answer)
- Drink 1 L 30 minutes before exercise to maximize plasma volume
- Avoid fluids 2 hours pre-exercise to prevent GI distress
Correct answer: Consume 5–7 mL/kg body weight at least 4 hours before exercise
ACSM recommends 5–7 mL/kg at least 4 hours before exercise, allowing time for renal excretion of excess fluid and achieving euhydration without GI discomfort.
Question 7: During cold-weather endurance exercise (−5°C), an athlete reports not feeling thirsty and drinks very little. What is the primary hydration risk in this scenario?
- Hyperhydration from increased ADH in cold
- Voluntary dehydration due to blunted thirst sensation and underestimated sweat losses under cold-weather gear (Correct answer)
- Electrolyte toxicity from concentrated sports drinks in cold
- Reduced sweat rate eliminating all hydration needs
Correct answer: Voluntary dehydration due to blunted thirst sensation and underestimated sweat losses under cold-weather gear
Cold blunts thirst perception and heavy clothing can produce substantial insensible sweat losses, leading athletes to underestimate dehydration risk in cold environments.
CSSD Hydration Strategies 5
A young female gymnast weighing 48 kg trains 4 hours daily indoors.
Her sweat rate is 0.8 L/hr.
Which hydration recommendation is most appropriate?