Caffeine Intake and Physical Performance Quiz

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What is the recommended maximum daily caffeine intake for teenagers?

500 milligrams
100 milligrams (correct)
200 milligrams
1000 milligrams

How much caffeine in a single dose can be fatal?

10,000 milligrams (correct)
20,000 milligrams
5000 milligrams
1000 milligrams

What is the suggested caffeine intake before exercise according to sports-medicine experts?

25-50 milligrams per kilogram of body weight
2-6 milligrams per kilogram of body weight (correct)
7-10 milligrams per kilogram of body weight
10-20 milligrams per kilogram of body weight

What is the main function of citrulline in the body?

Breaks down into nitric oxide to expand blood vessels (A) Signup and view all the answers

Why is increased blood flow beneficial during exercise?

It speeds up the removal of waste products causing muscle fatigue (D) Signup and view all the answers

What does research say about the effect of citrulline as a performance supplement?

It has a mixed effect and may improve, hinder, or have no effect on performance (B) Signup and view all the answers

What is the effect of arginine supplements on strengthening and muscle-building exercises?

They have little to no effect (D) Signup and view all the answers

What is the recommended maximum daily intake of arginine supplements for safety?

9 grams (C) Signup and view all the answers

How does beet juice potentially improve athletic performance?

By expanding blood vessels (A) Signup and view all the answers

What is one of the benefits of blood vessel expansion caused by nitric oxide from beet juice?

Speeding up the removal of waste products that cause muscle fatigue (C) Signup and view all the answers

What type of exercises have shown improvement with beet juice intake?

Aerobic activities like running and cycling (A) Signup and view all the answers

What can happen when users take more than 9 grams of arginine supplements per day?

GI discomfort and slightly lower blood pressure (B) Signup and view all the answers

What is the main reason why makers of performance supplements usually don’t carry out studies in people to find out if their products work and are safe?

Research often involves small numbers of participants and short durations (D) Signup and view all the answers

Why are antioxidants (like vitamin C and vitamin E) often included in supplements for exercise and athletic performance?

To reduce muscle inflammation, soreness, and fatigue caused by exercise (B) Signup and view all the answers

Why might taking antioxidant supplements hinder the benefits of exercise such as muscle growth and power output?

They interfere with the natural process of free radicals aiding muscle fibers (C) Signup and view all the answers

Why hasn't research on supplement ingredients been conducted on women, middle-aged adults, or teenagers?

Focus on studying young healthy men (A) Signup and view all the answers

How do free radicals formed during exercise affect muscle cells?

They improve muscle growth and energy production (A) Signup and view all the answers

Why do studies on performance supplement ingredients often involve small numbers of people for short durations?

To investigate immediate effects rather than long-term impacts (D) Signup and view all the answers