Lab 4 Questions Flashcards
- Why would one person have a greater force output than another for an electrical stimulus delivered to a muscle?
Because it is based off their twitchy property ties, one person could have more fast twitch meaning they could produce a greater force output when a stimulus is delivered
-more muscle mass causes someone to be stronger, also a cause
- What enzymes in the muscle influence time to peak tension and relaxation time in response to a single electrical stimulus?
ATPase enzymes would influence time to peak tension and relaxation time
-as more myosin ATPase decreases time to peak tension
-and a higher SR ATPase influences reaction time causing it to be shorter
- Within a single muscle fiber, what causes summation when action potentials are delivered to the muscle fibre membrane at higher and higher frequencies?
Summation is caused by a contraction of the muscle without time to relax
-calcium can’t be pumped out fast enough and is getting released from the SR at a continuous rate
- What causes tetanus once a very high frequency of stim is reached?
Excess calcium release from the SR which binds to Troponin before the muscle can completely relax
-if all the sites are occupied/ fully saturated with Troponin, this is Tetanus
- A) How does a single session of box jumping affect the twitch contractile properties of the legs measured two minutes later:
(Torque development, peak force, rate of relaxation)
Would decrease the twitch contractile properties due to fatigue of continuous use of the fibers causing them to lower in maximum force and velocity
-rate of relaxation would also decrease
- B) What is the fatigue of continuous use of the fibers called?
Neural adaptation
-due to post activation hypertentiation
- What effect does 30 seconds of static stretching have on muscle twitch properties? What happens if the 30 second stretch is repeated several times?
It would decrease the twitch torque and force development because of fatigue and activation of the GTO, and would not reduce any further if the stretch was repeated several times
