Lab exam 2 Flashcards
muscular strength
the largest force produced by a single muscle or group of muscles during a contraction
muscular endurance
the ability to produce force from repeated muscle contractions
how many repetitions are done prior to moving onto the next load in a 1-RM testing
2 reps
what is the relationship between load and velocity
negative logarithmic correlation where as the load increases velocity decreases
what is the relationship between load, velocity and power
it had a positive parabolic relationship where load increased and velocity decreased and load increased when power slowly increased
how does the ultrasound produce images
through high frequency ultrasonic waves
in what plane is the muscle morphology performed in
the longitudinal plan (the long axis of the muscle
in what plane is the echo intensity assessment perfomed in
the transverse plane (perpendivular to the long axis of the muscle)
- muslces, subcutaneous fat, bone, and nerves are all visible
what does darker colors on ulatrasounds mean
it has low echo intensity
- due to uniform structures or thicker thicknesses
what is pennation for in muscles
- it can allow for more force production
- and can pack more muscle fibers into a single muscle
what is isokinetic muscle action
type of dynamic muscle action at a constance velocity
- no gain or loss of momentum throughout the truly isokinetic movement
how does an isokinetic device control the angular velocity of the exercise
allows for musculature to elicit maximal tension for each angle within the ovement range
what is a slow isokinetic velocituy
60 degrees/s
what is a medium isokinetic velocity
180 degrees/s
what is a fast isokinetic velocity
300degrees/s
what is knee extension
the strength of the quadriceps muscle group
what is knee flexion
the strength of the hamstring muscle group
bilateral strength
comparison of strength between two limbs (right and left)
percent deficit
(higher peak torque - lower peak torque)/higher peak torque
between the right and left side
what does strength imbalances mean
can iincrease risk of muscle strain
what is a significant bilateral stregnth difference
10-15% difference
what is a good way to assess ACL injury and hamstring starin
the hamstring and quadriceps ratio
ipsilateral strength
comparison of strength between opposing or reciprocal muscles in the same limb
conventioal ratio for ipsilateral strength
comparison of concentric flexion (hamstrings) to concentral extension (quadriceps)
