Lab 2 Questions Flashcards
- Why is force different at lower velocities compared to higher velocities
As force increases, velocity decreases, with a graph you would see velocity increasing and force decreasing, and vice versa
-on a graph when velocity is high, force would be low
When velocity is low, force is high
lower velocity allows for more cross bridge formation and more force development
Higher velocity means less time for cross bridges to form and therefore lowering force production
- Kathy trains legs using high speed sprints at low resistance. Anne trains but does sprints using a high resistance at a lower speed. Where on a force- velocity graph would you see most improvement for each? Who would have the greatest increase in power?
Kathy would see an average decrease in force over time as fatigue sets in, but velocity would stay the same as she is training for long duration races
-increase velocity rather than power
Anne would be at max force and velocity earlier, but would fatigue faster.
Anne would have greatest increase in power while Kathy would have the greatest increase in
- What contributes more to the reduced power output in older people. Reduced strength or reduced velocity?
Reduced strength would have the greater impact on older peoples reduced power output
-due to the disuse of body that comes with not as much movement with age, and shrinking of muscles with age
- What implications does reduced strength have for an exercise program designed for older people? What exercises might be prescribed?
Could help reduce the loss by doing weight lifting, resistance training, etc to increase muscle mass and strength
- A) which enzyme/ protein in your muscle fibers is important for determining speed of contraction
Myosin ATPase
- B) How might the amount of myosin ATPase differ between an elite cross country skier and an elite hockey player?
Hockey players would have more ATPase enzyme and type 2 fibers which would cause a greater contraction speed
-very explosive and fast paced, short shifts
Cross country skiers would have less ATPase activity and more slow twitch muscle fibers as they perform long and full body contractions repetitively which would need a more aerobic muscle fibers
- If someone has access to an isokinetic dynamometer to control the velocity of contractions during strength training, which type of training would you recommend for the greatest gains in muscle hypertrophy?
Recommend eccentric fast because the greater force production during eccentric causes more muscle damage which creates more hypertrophy. With more muscle damage, there is more repair happening via satellite cells, causing the cells to grow in size
