Physiology of Exercise. Two worksheets. One about bioenergetics and the other about substrate. Total of 21 Exercises
Physiology of Exercise
POGIL
Chapter 2: Bioenergetics
Objectives: to develop an understanding of the three (3) bioenergetics pathways
Background Information:
- Anaerobic metabolism: ATP formation in the absence of oxygen. ATP-PCr & Glycolysis are anaerobic.
- Phosphagen System: ATP replenishment through phosphocreatine
- Glycolytic System: ATP production through the breakdown of glucose
- Aerobic Metabolism: ATP formation with the presence of oxygen
- Oxidative Phosphorylation: ATP formation in the mitochondria
Figure: Energy Contribution from different ATP production systems
- Briefly explain what this graph is representing.
- Given the figure above, describe the % energy source for each period:
- Short sprint lasting 10 seconds
- 400 M sprint lasting 60 seconds
- Jog lasting 4 minutes
- What is a sport that would primarily rely on each. . .
- ATP-PCr
- Glycolysis
- Oxidative Phosphorylation
| Characteristic | Type I | Type IIa | Type IIx |
| Speed of contraction | Slow | Fast | Fast |
| Fatigue Resistance | High | Intermediate | Low |
| Endurance | High | Intermediate | Low |
| Force Production | Low | Intermediate | High |
| Power Output | Low | Intermediate | High |
| Mitochondrial size/density | High | Intermediate | Low |
| Capillary Density | High | High | Low |
| Glycogen Content | Low | Moderate | High |
| ATPase Activity | Low | High | High |
- Looking at the table above, which muscle fiber is the most equipped to produce energy for muscular contraction via aerobic means? Why?
- Looking at the table above, which muscle fiber is most equipped to produce the fastest movements and power possible? Why?
- In terms of bioenergetics, what is the benefit of a muscle fiber having a higher mitochondrial size and/or density?
- In terms of bioenergetics, what is the benefit of a muscle fiber having a higher glycogen content?
- “Creatine” (creatine phosphate) supplementation is fairly common and is typically beneficial for some athletic performances. In your own words, what could the physiologic reasoning for this?
