Neuromuscular Physiology III

Question 1

Strength:

Answer 1

Maximum force or tension generated by single muscle group or related muscle groups

Question 2

What methods can strength be measured through?

Answer 2

• Tensiometry
• Dynamometry
• Strength Assessments (1RM)
• Isokinetic strength

Question 3

Strength measurement - Tensiometry

Answer 3

measures muscle force in a static (isometric) muscle action

Question 4

Strength measurement - Dynamometry

Answer 4

static strength measurement based on compression

Question 5

Strength measurement - Strength assessments (1RM)

Answer 5

Maximum amount of weight lifted 1 time using proper form during standard weight-lifting exercise

Question 6

Strength measurement - isokinetic strength

Answer 6

maintaining a constant velocity of contraction, measuring the maximum force through ROM

Question 7

2 ways CNS modifies force production

Answer 7

• recruitment
• rate coding

Question 8

Excitation-contraction coupling steps

Answer 8

1. ACh released from axon terminal binds to receptors on the sarcolemma
2. an AP is generated and travels down the T tubule
3. Ca2+ is released from the SR in response to the change in voltage
4. Ca2+ binds troponin; Cross-bridges form between actin and myosin
5. AChterase removes ACh from the synaptic cleft
6. Ca2+ is transported back into the SR
7. Tropomyosin binds active sites on actin causing the cross-bridge to detach

Question 9

Cross-bridge cycling steps - simple

Answer 9

1. Myosin cross-bridge attaches
2. Power stroke
3. As new ATP attaches to the myosin head, the cross-bridge detaches
4. As ATP is split into ADP and the Pi the myosin head is repositioned
   REPEAT

Question 10

exercise fatigue definition

Answer 10

exercise-induced decrease un maximum force- and/or max power-generating capacity