Chapter 2- BIOMECHANICS OF RESISTANCE EXERCISE Flashcards
Which of the following is the definition of power? A. Mass x accerleration B. Force x distance C. Force x velocity D. Torque x time
C. FOrce x velocity
To compare performances of OLY weight lifters of different body weights, the classic formula divides the load lifted by the athletes? A. Body weight B. Body weight squared C. Lean body weight D. Body weight to the two-thirds power
D. Body weight to the two-thirds power
During a free weight exercise, muscle force varies with which of the following?
Perpendicular distance from the weight to the body joint
Movement acceleration
A vertical jump involves knee, hip, and shoulder movement primarily in which of the following anatomical plane? A. Sagittal B. Perpendicular C. Frontal D. Transverse
A.Sagittal
An athlete is performing a concentric isokinetic elbow flex ion and extension exercise. Which of the following types of levers occur at the elbow during this exercise? I.first class II. Second class III. Third class
First and third class
____ focuses on the mechanisms through which the musculoskeletal components interact to create movement.
Biomechanics
The muscle most directly involved in bringing about a movement is called the prime mover or _____
A. Antagonist
B. Agonist
B.Agonist
The muscle that can slow down or stop the movement is called the___
A. Agonist
B. Antagonist
B.Antagonist
During throwing, the triceps act as an ____, extending the elbow to accelerate the ball. As the elbow reaches full extension, the biceps acts as an ____ to slow down elbow extension and bring it to a stop.
A. Antagonist, agonist
B. Agonist, antagonist
B. Agonist, antagonist
A muscle called a ____ when it assist indirectly in a movement
Synergistic
A lever for which the muscle force and resistive force act on opposite sides of the fulcrum
FIrst class lever
The pivot point of a lever
Fulcrum
A rigid or semirigid body that, when subjected to a force whose line of action does not pass through its pivot point
Lever
The ratio of the moment arm through which an applied force acts to that through which a resistive force acts
Mechanical advantage
The perpendicular distance from the line of action of the force to the fulcrum.
Moment arm
Force generated by biochemical activity, or Te stretching of no contractile tissue, that tends to draw the opposite ends of a muscle towards each other
Muscle force
Force generated by a source external to the body that acts contrary to muscle force
Resistive force
A lever for which the muscle force and resistive force act on the same side of the fulcrum, with the muscle force acting through a moment arm longer than that through which the resistive force acts
Second class lever
A lever for which the muscle force and resistive force act on the same side of the fulcrum
Third class lever
The degree to which a force tends to rotate an object about a specific fulcrum
Torque
Most of the skeletal muscles operate at a considerable mechanical ______ due to the lever arrangement within the body and relative to the external forces the body resist.
Disadvantage