Muscular Force Flashcards
Force
An influence applied by one object to another, which results in the acceleration or deceleration of the second object
Length- Tension Relationship
The resting length of a muscle & the tension the muscle can produce at this resting length
Actin
The thin, stringlike, myofilament that acts along with myosin to produce muscular contraction
Myosin
The thick myofilament that acts along with actin to produce muscular contraction
Sarcomere
The structural unit of a myofibril composed of actin & myosin filaments between two Z- lines
Muscle Balance
When all muscles surrounding a joint have optimal length- tension relationships, allowing the joint to rest in a neutral position
Altered Length- Tension Relationship
When a muscle’s resting length is too short or too long, reducing the amount of force it can produce
Reciprocal Inhibition
When an agonist receives signal to contract, its functional antagonist also receives an inhibitory signal allowing it to lengthen
Muscle Imbalance
When muscles on each sides of a joint have altered length- tension relationships
Neutral Position
The optimal resting position of a joint that allows it to function efficiently through its entire normal range of motion
Stretch- Shortening Cycle
Loading of a muscle eccentrically to prepare it for a rapid concentric contraction
Series Elastic Component
Springlike non-contractile component of muscle & tendon that stores elastic energy
Amortization Phase
The transition from eccentric loading to concentric unloading during the stretch- shortening cycle
Stretch Reflex
Neurological signal from the muscle spindle that causes a muscle to contract to prevent excessive lengthening
Integrated Performance Paradigm
To move with efficiency, forces must be dampened (eccentrically), stabilized (isometrically), & then accelerated (concentrically)
