CDN Sports Nutrition & Performance 4

Question 1

A 16-year-old adolescent football player asks about creatine supplementation. What is the most appropriate recommendation?

Accepted Answer

Discourage use due to insufficient safety data in adolescents

Answer

Major sports nutrition organizations discourage creatine supplementation in athletes under 18 due to insufficient long-term safety data, and recommend food-first strategies instead.

Question 2

Which carbohydrate type is most recommended for consumption during exercise lasting longer than 2.5 hours to maximize oxidation rates beyond 60g/hr?

Accepted Answer

Multiple transportable carbohydrates (glucose + fructose)

Answer

Multiple transportable carbohydrates using both SGLT1 (glucose) and GLUT5 (fructose) transporters allow oxidation rates of 90g/hr+, exceeding the ~60g/hr ceiling achievable with a single carbohydrate.

Question 3

A sports dietitian is calculating energy expenditure for a competitive rower. Which equation is most appropriate for estimating resting metabolic rate in athletes?

Accepted Answer

Cunningham equation (using lean body mass)

Answer

The Cunningham equation uses lean body mass rather than total weight, making it more accurate for athletes who have higher muscle mass than the general population.

Question 4

A climber training at sea level for a high-altitude expedition asks about beetroot juice. What is the proposed mechanism for its ergogenic benefit?

Accepted Answer

Enhancing nitric oxide production to improve oxygen delivery

Answer

Dietary nitrate in beetroot juice is converted to nitric oxide in the body, which vasodilates blood vessels and improves oxygen delivery efficiency, particularly beneficial at altitude.

Question 5

A sports dietitian is advising on caffeine timing for a 10 AM competition. Based on pharmacokinetics, when should the athlete consume caffeine?

Accepted Answer

9:00 AM (60 minutes before)

Answer

Caffeine reaches peak plasma concentration approximately 60 minutes after ingestion, so consuming it 60 minutes before a 10 AM competition (at 9 AM) is optimal for performance benefits.

(CDN) Certified Dietician Nutritionist Practice Test

(CDN) Certified Dietician Nutritionist Practice Test

CDN Sports Nutrition & Performance 4