S1L8 Muscular Adaptations II

Question 1

Does muscle myoglobin increase with endurance exercise?

Answer 1

Not in humans, but may be an increase in mammals.

Question 2

how is muscle glycogen adapted to endurance training?

Answer 2

endurance training causes an increase in glycogen stores

Question 3

How does GLUT 4 expression help this adaptation?

Answer 3

insulin causes increase in GLUT4 translocation into muscle - storing as glycogen. key enzyme = glycogen synthase.
trained individuals have higher concs of GS so higher levels of GLUT4 translocation

Question 4

How does fat oxidation adapt to endurance training?

Answer 4

fat oxidation increases - IMTG and IMCL storage and utilisation increases

Question 5

how are oxidative enzymes adapted to endurance training?

Answer 5

endurance training increases oxidative enzyme activity.
* increased SDH activity
* increase CS activity
* SDH dictates level of changes in other oxidative enzymes

Question 6

How can fuel use adapt to endurance training?

Answer 6

• can shift fat max to a higher relative intensity
• can shift from CHO to fat oxidation at higher intensities - able to use fat at higher rates of intensity.