Sports Nutrition Discussion Board #3

The video discusses the concept of fasted endurance exercise, highlighting its potential benefits such as increased reliance on fatty acid oxidation and weight loss. However, it also outlines several drawbacks, including reduced motivation, lower calorie burn, and increased stress responses due to elevated AMPK and cortisol levels. The impact on muscle fibers and protein synthesis is examined, noting potential muscle atrophy and reliance on amino acids for energy. The video concludes with considerations for resistance training, emphasizing the challenges of low blood glucose and its effects on type 2X muscle fibers and protein synthesis.

What is one proposed benefit of exercising in a fasted state?

• Increased reliance on carbohydrates

• Enhanced muscle glycogen storage

• Increased reliance on fatty acid oxidation

• Higher blood sugar levels

Why might motivation be a challenge for fasted state exercise?

• It requires eating a large meal beforehand

• It requires specialized equipment

• It involves exercising without eating first

• It is typically done late at night

What is a consequence of increased AMPK activity during fasted exercise?

• Improved skill acquisition

• Increased calorie burn

• Enhanced muscle growth

• Decreased calorie burn

How does cortisol affect the body during fasted state exercise?

• It reduces stress

• It lowers blood glucose levels

• It prevents fat loss

• It enhances fat loss

What is a potential negative effect of high AMPK levels on muscles?

• Increased protein synthesis

• Increased reliance on amino acids for energy

• Enhanced muscle growth

• Decreased protein degradation

What happens to muscle protein synthesis during fasted state exercise?

• It remains unchanged

• It is enhanced

• It is inhibited

• It accelerates

Which muscle fibers are more dependent on glycolysis during resistance training?

• Type 1 muscle fibers

• Type 3 muscle fibers

• Type 2A muscle fibers

• Type 2X muscle fibers

What is the primary energy system used by type 2X muscle fibers?

• Phosphocreatine system

• Fatty acid oxidation

• Lipid metabolism

• Aerobic respiration

How does fasted state exercise affect BCAAs in muscles?

• Decreases their metabolism

• Increases their availability

• Increases their metabolism

• Has no effect

What is a likely outcome of resistance training in a fasted state?

• Improved workout quality

• Enhanced muscle growth

• Increased energy levels

• Stunted muscle protein synthesis