Sports Nutrition Discussion Board 5

The video discusses the role of free radicals in skeletal muscle during rest and exercise, highlighting their importance in endurance training adaptations. It explains how excessive antioxidant supplementation can hinder these adaptations. In contrast, free radicals are not significant stimuli for muscle hypertrophy in strength training, so antioxidant intake does not affect these adaptations.

What are the main sources of free radical generation in skeletal muscles?

• Dietary supplements

• Enzymes in the electron transport chain

• Vitamin C intake

• Muscle contractions

How do free radicals affect endurance training adaptations?

• They cause muscle fatigue

• They reduce oxidative capacity

• They stimulate mitochondrial biogenesis

• They hinder muscle growth

What is the role of PGC 1A in endurance training?

• It decreases oxidative stress

• It is a master regulator of mitochondrial biogenesis

• It inhibits free radical production

• It regulates muscle hypertrophy

Why might excessive antioxidant supplementation be detrimental to endurance training?

• It causes oxidative damage

• It increases free radical production

• It quenches free radicals, reducing necessary adaptations

• It enhances muscle fatigue

Which of the following is NOT a major adaptation in endurance training?

• Increased oxidative capacity

• Fast to slow fiber type shift

• Mitochondrial biogenesis

• Increased muscle hypertrophy

What is the primary stimulus for muscle hypertrophy in strength training?

• Free radicals

• Mechanical load and muscle stretch

• Antioxidant intake

• Endurance exercise

How do antioxidants affect muscle hypertrophy in strength training?

• They significantly enhance muscle growth

• They have little to no effect

• They increase free radical production

• They reduce muscle strength