Sports Nutrition: Carbohydrates, Proteins, and Hydration for Athletes

What is the benefit of high-carbohydrate intake during intensified training?

It can delay or reduce the magnitude of overreaching symptoms like decreased performance, reduced endocrine responsiveness, and disturbed mood.

What is the relationship between exercise intensity and substrate use?

Higher intensity increases carbohydrate use, while lower intensity increases fat use.

What is the dose-response relationship between muscle glycogen and exercise intensity?

High-intensity exercise uses more glycogen, while low-intensity exercise uses less.

Where are carbohydrates stored in the body?

In the liver and the muscles.

What is the primary fuel source for the body during higher-intensity exercise?

Carbohydrates.

What is the daily carbohydrate recommendation for endurance athletes to support training?

7-12 g/kg/day.

What is the carbohydrate recommendation for the 1-4 hours before competition?

1-4 g/kg.

What is the carbohydrate recommendation during events longer than 60 minutes?

30-90 g/hour.

What is the recommended carbohydrate intake for rapid glycogen restoration post-exercise?

1.0-1.2 g/kg/hour for the first 4 hours.

What are the limitations of glucose intake during performance?

Gastrointestinal distress, potential reactive hypoglycemia, and a maximum intestinal absorption rate.

What is the maximum intestinal absorption rate for glucose alone?

1 gram per minute.

What is the maximum intestinal absorption rate for a glucose and fructose combination?

1.5 grams per minute.

What percentage of dehydration is associated with a decrease in endurance performance?

2%.

How does dehydration affect thermoregulation?

It impairs the body's ability to remove heat.

What is the potential sweat loss rate for athletes during strenuous exercise?

Up to 2-3 liters per hour.

What is the recommended daily protein intake for endurance athletes?

1.2 to 1.8 g/kg body weight per day.

Why is it important to consume carbohydrates during endurance events?

To maintain blood glucose levels and maximize performance.

What happens if an athlete consumes more than 1.5 grams of carbohydrates per minute?

There is no additional benefit and it typically results in gastrointestinal issues.

What is the primary goal of drinking fluids throughout the day for an athlete?

To recover from a training session and ensure the athlete starts the next session hydrated.

Why is high-carbohydrate intake important for competition performance?

It maximizes glycogen stores for optimal performance in endurance events.

What are the primary physical characteristics of team sport athletes?

A mixture of high and low intensity activity, changes in pace and direction, specific skill requirements, physical contests, and the use of equipment like balls or pucks.

Which types of team sports typically have the highest energy requirements?

Sports involving continuous motion, high-intensity intervals, and long durations, such as soccer, basketball, ice hockey, and rugby.

What is the recommended daily carbohydrate intake range for team sport athletes?

3-5 or 5-7 g/kg per day, depending on individual needs, position, and intensity.

How does an athlete's position or intensity affect their carbohydrate requirements?

Carbohydrate needs are highly individualized and must be adjusted based on the specific demands of the athlete's position and the intensity of their training or competition.

What defines a 'fast' carbohydrate in the context of sports nutrition?

A carbohydrate that is easily digested, rapidly absorbed, and quickly oxidized for energy.

What defines a 'slow' carbohydrate in the context of sports nutrition?

A carbohydrate that is slowly digested and not as rapidly absorbed or oxidized.

What are the physiological consequences of dehydration on heat regulation?

Dehydration impairs the body's ability to remove heat, increasing the risk of heat illness.

How does dehydration affect cardiovascular function?

It leads to increased cardiovascular strain.

What impact does dehydration have on metabolic and CNS function?

It causes altered metabolic and central nervous system function.

How does dehydration influence glycogen usage?

It leads to increased glycogen use.

What is the effect of dehydration on fluid absorption?

It results in decreased fluid absorption.

What is the recommended daily protein intake for team sport athletes?

1.2-2.0 g/kg/day.

Why might a team sport athlete require protein intake at the higher end of the recommended range?

To support recovery during periods of heavy training or congested match schedules.

How does protein intake compare to sugar or fat regarding sleep quality?

Protein is considered to assist sleep more effectively than sugar or fat.

Which specific type of protein is recommended for sleep and recovery?

Casein.

Why is constant, full-body activity (like treading water) energy-intensive?

It requires sustained, high-level muscular effort to maintain position and perform, significantly increasing total energy expenditure.

What is the primary risk associated with the body's impaired ability to remove heat due to dehydration?

The risk of heat illness.

True or False: All team sport athletes require the same amount of carbohydrates.

False; carbohydrate needs vary widely based on the individual, their specific position, and the intensity of their activity.

What is the main purpose of consuming protein during recovery for team sport athletes?

To support muscle repair and recovery, especially during heavy training or frequent match schedules.

Protein requirements for strength and power athletes

1.6-2.8 g/kg body weight

Carbohydrate requirements for strength and power athletes

5-7+ g/kg body weight

Fat requirements for strength and power athletes

20-35% of total calories

Function of protein in strength and power athletes

Essential for muscle growth and repair, with the higher range needed during caloric deficits or heavy training.

Function of carbohydrates in strength and power athletes

Necessary for fueling anaerobic metabolism.

Function of fats in strength and power athletes

Essential for hormone production and long-term energy, preferably from healthy sources

Recommended daily protein intake for strength athletes

1.6 to 1.7 g/kg b.w./day

Carbohydrate intake for extreme training loads

8-12 g/kg

Post-competition carbohydrate recommendation for glycogen replenishment

1.0-1.2 g/kg of body weight immediately after, ideally within the first 1-2 hours

Post-competition protein recommendation for muscle repair

20-25 g of high-quality protein (containing all 20 amino acids) quickly after exercise

Condition requiring higher carbohydrate intake for glycogen replenishment

Competing again within 8 hours

What is Periodized Nutrition

Manipulation of variables to achieve a specific outcome (planned, progressive, structured)

What does periodized nutrition refer to?

refers to the strategic combined use of exercise training and nutrition, or nutrition only, with the overall aim to obtain adaptations that support exercise performance.

What do the words 'training' and 'periodized' refer to by definition?

a structured and planned process.

How should nutrition be periodized for athletes?

Nutrition should be periodized and adapted to support changing individual goals, training levels, and requirements throughout a season and/or training cycle.

What do periodized nutrition methods include regarding nutrient availability?

These methods include manipulations of nutrient availability before, during, and after training

How can nutritional manipulation prepare organs for competition?

improving stomach comfort by regularly drinking large volumes