Muscle Energy/Articulatory Principles

Question 1

what is muscle energy

Answer 1

patients muscles are actively used on request, from a precisely controlled position, in a specific direction, against a distinctly executed physician counterforce

ACTIVE and DIRECT

Question 2

eccentric contraction

Answer 2

muscle tension allows origin and insertion to separate

LENGTHENS the muscle

Question 3

concentric contraction

Answer 3

shortens the muscle

Question 4

isotonic contraction

Answer 4

concentric OR eccentric contraction against a steady but yielding counterforce, allowing a constant tone (constant weight)

Question 5

isokinetic contraction

Answer 5

concentric contraction in which the joint motion is at a constant rate/speed (weight can vary)

EX: keeping the same RPMs on a bike while changing resistance

Question 6

isolytic contraction

Answer 6

eccentric contraction in which the muscle’s concentric contraction is OVERPOWERED by a stronger counterforce leading to a lengthening of a muscle

Question 7

isomeric contraction

Answer 7

distance between the origin and the insertion of the muscles is maintained at a constant length (neither eccentric or concentric)

EX: wall sits

Question 8

post-isometric relaxation

Answer 8

MOST COMMON MUSCLE ENERGY

goal: muscle relaxation
physiology: right after an isometric contraction, the neuromuscular apparatus is in REFRACTORY state, so passive stretching can be done without encountering a strong myotactic reflex opposition
force of contraction: sustained gentle pressure (10-20 lbs)