Lab 1 Questions Flashcards
- How to calculate fatigue index?
(Mean torque 1-3 contractions) - (mean torque 48-50 contraction) X 100 / mean torque 1-3 contractions
- How to calculate predicted fiber type?
Fatigue index-5.2 / 0.9
- Muscle sample 1 has high fibers that contain high ATPase activity and high mitochondrial concentration, who would this come from?
Would be a genetically gifted sprinter because they would have fast twitch muscle fibers, which would have the high ATPase activity and high mitochondrial concentration. Even though sprinters don’t usually have a high mitochondrial index (good fatigue ability), he has been training intense aerobic endurance training which would cause the increase
- Muscle sample 2 has fibers that contain low ATPase activity and moderate mitochondrial concentration, who would this come from?
Would come from the not a good sprinter but has moderate endurance capacity because they have low ATPase activity which means not fast twitch but would mean it takes them a while to fatigue/ drop in performance
- Rank the 3 major fiber types in regards to: Rate of Relaxation
Highest Rate: Type 2x
Medium rate: 2a
Lowest rate: Type 1
- Rank the 3 major fiber types in regards to: Sarcoplasmic Reticulum ATPase
Highest: 2x
Medium: 2a
Lowest: Type 1
- Rank the 3 major fiber types in regards to: Amount of lactic acid produced during exercise
Most: 2x
Medium: 2a
Least: Type 1
- Rank the 3 major fiber types in regards to: Amount of Mitochondria
Most: Type 1
Medium: type 2a
Least: 2x
- Rank the 3 major fiber types in regards to: ability to increase in size with strength training
Highest ability: 2x
Medium: 2a
Least: type 1
- Rank the 3 major fiber types in regards to: colour, from most red to white
Most red: 1a (myoglobin)
Medium: 2x
Least: 2a
- How would muscle fibers type composition of the legs change:
A) If you undertook a program of long-distance running
The fibers could go from type 2x fibers to 2a fibers to move to more oxidative properties to allow for less fatigue and more oxygen to be carried as more mitochondria would be recruited by switching to 2a
- How would muscle fibers type composition of the legs change:
B) If your legs were immobilized and put in a cast for 5 weeks
All muscle fibers would become unused, but there would be more fast twitch because there is no endurance needed
-more needed for short, explosive movements like getting up onto a bed
-endurance would be highly decreased since they are not in use
- How would muscle fibers type composition of the legs change:
C) If you were an astronaut involved in a month long stay at the ISS
Less slow twitch/ 1a fibers could change to fast/ 2a fibers
-without gravity, fibers would decrease in size due to not using them
-slow twitch are affected more as they are more involved in posture and balance, which aren’t needed in space
-same as walking and standing, would switch to type 2 fibers because of this
- How would muscle fibers type composition of the legs change:
D) if you had a disease which restricted your level of physical activity
Less slow twitch fibers would be being used as the body is not fatiguing and using its aerobic capacity, so they would change to fast twitch
-fibers would also shrink in size
-loss of muscle strength and coordination
