Module 12 - Biarticular Muscles & Muscle Force Measurement Flashcards
1
Q
What is the coactivation of the RF and Ham known as?
A
- Lombard’s paradox
2
Q
What is Lombard’s Paradox? why does this happen?
A
- Coactivation of the RF and Ham
- They are antagonists
- Only one ‘anatomic’ function involved
3
Q
How does one stand from a seated position?
A
- Net moment has to be extensor moment at both hip and knee
- Rectus Femoris moment needs to be greater than Hamstring at the knee joint
4
Q
What is a biarticular muscle?
A
- Crosses 2 joints instead of one
5
Q
What did the study of frog hopping illustrate?
A
- Role of biarticular muscles role may be different than traditionally assumed
6
Q
Describe what the study of frog hopping found regarding the biarticular muscle ST
A
- ST undergoes shortening and then lengthing (single movemnt)
- ST not shortening during entire action
- ST actively stretched during movement
- Even though ST active, it is not actively flexing knee during motion
7
Q
What does the monoarticular vastus lateralis and intermedius affect?
A
- Hip and Ankle moment
8
Q
How does the vasti muscles (monoarticular knee extensors) generate an extensor moment at the hip joint?
A
- Through the ST muscles
9
Q
What can a dorsiflexion moment generated by the TA lead to in the Gas?
A
- Knee flexor moment through Gas
10
Q
What different techniques have been used to directly measure MTU force in humans?
A
- Buckle transducer
- Fiber Optic Probe
- Muscle stimulation during a surgical procedure
11
Q
What are the limitations of the techniques used to directly measure MTU force in humans?
A
- Invasive
