Bioenergetics of Resistance Training Flashcards
Bioenergetics
Flow of energy in biological systems
Exergonic Reactions
Energy releasing reactions; generally catabolic
Endergonic Reactions
Energy requiring reactions; generally anabolic
Hydrolysis
The breakdown of 1 ATP to yield energy; requires water
What does ATPase do?
Catalyzes the hydrolysis of ATP
What does myosin ATPase do?
Catalyzes ATP hydrolysis for cross-bridge recycling in the muscle
What are the 3 basic energy systems and where do they primarily take place?
- Phosphagen System (sarcoplasm of cell) 2. Glycolytic System (sarcoplasm of cell) 3. Oxidative System (mitochondria of cell)
Of the 3 macronutrients, which one is the only one that can be metabolized for energy without oxygen?
Carbohydrates
What metabolic reaction occurs in the phosphagen system?
ADP + CP (creatine phosphate) –> ATP and creatine
What type of activity does the phosphagen system provide energy for?
High intensity, short-duration exercise; is also highly active at the start of all exercise regardless of intensity
True or False: Type 2 (fast twitch) muscle fibers contain higher concentrations of CP than Type 1 (slow twitch)?
True
What reaction occurs in glycolysis?
Glucose –> pyruvate + ATP
What happens to pyruvate in anaerobic (fast) glycolysis?
It is converted into lactate (ATP re-synthesis occurs at a faster rate but is limited in duration due to H+ production and decrease in pH)
What happens during aerobic (slow) glycolysis?
Pyruvate is shuttled into the mitochondria to undergo the Krebs Cycle (ATP re-synthesis occurs at a slower rate due to the numerous reactions but can occur for longer duration)
