University:
McMaster University
Course:
NHW 100 | Nutrition Fundamentals
Academic year:

2021
Views:

309

Pages:

1
Author:

Sabrina S.

Module 3 Questions What do we do with lactate? We want lactate to end up in the blood & to be transported to the liver where it is first converted to pyruvate, then to glucose (gluconeogenesis) Typically that glucose will be put back into the blood and transported back to the working muscle where it can be used again. To make ATP, How many Acetyl-CoA will be produced when glycolysis uses 5 glucose under low intensity conditions? 10 Acetyl-CoA will be produced. What are the products of glycolysis? ATP, NADH, pyruvate Which of the following molecules are products of the Krebs cycle? FADH2, NADH, ATP Substrate Utilization Muscle fiber types, orderly recruitment and substrate utilization When you have more mitochondria you are better able to to use fat as an energy source "you can also convert more pyruvate/lactate to Acetyl-CoA which is key as to why lactate threshold increases w/ fitness. Mitochondria house oxidative enzymes (they use o2) to make ATP from Acetyl-CoA more mitochondria more oxidative enzymes The substrate for glycolysis is glucose (CHO) and its product is pyruvate/Lactate The more glycolytic enzymes found in muscle causes.... A higher use of carbohydrate A higher production of pyruvate or lactate Endurance fitness gives us more mitochondria which substrate is a committed distance runner able to use more of? FAT If you train for power (olympic lifts sprints), you will have lots of glycolytic enzymes and less mitochondria what substrate will you be better suited to use? CARBOHYDRATE Why do you think we use CHO as our main substrate choice during high intensity exercise? Which fiber type is recruited every time regardless of muscular contraction intensity? Type I fiber Muscle fiber type Characteristics Type I/Slow oxidative (RED) Oxidative capacity: HIGH Glycolytic capacity: Low Type IIa/Fast oxidative (RED) Oxidative capacity: HIGH Glycolytic capacity: HIGH Type IIx/Fast glycolytic (white) Oxidative capacity: Low Glycolytic capacity: HIGH Principle of Orderly Recruitment The idea that you recruit different amounts of the fiber type depending on the intensity of the contraction less weight more fibers recruited more weight less fibers recruited