Basic Biomechanics Terms and Definitions.pdf - Basic Biomechanics Terms and Definitions Absolute in biomechanics the term absolute commonly means the

# Basic Biomechanics Terms and Definitions.pdf - Basic...

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Basic Biomechanics: Terms and Definitions Absolute: in biomechanics, the term absolute commonly means the total amount regardless of bodyweight. Acceleration: acceleration examines the rate of change of velocity with respect to time, and is typically reported in meters per second per second (meters per second squared). Active: in biomechanics, active muscle forces are generated by muscle contractions, namely the sarcomeres. CMJ: CMJ stands for countermovement jump and is a common test used in research to measure jumping ability. It begins in the standing position with hands on the hip and involves a rapid countermovement until the knees reach 90- degree angle, whereby the movement is explosively reversed. COM: COM stands for center of mass and is the unique point where the weighted relative position of the distributed mass sums to zero. Another way of thinking of it is as a point in space determined by a distribution of mass, whereby a uniform force acting on that mass would act as if the distribution were located at just that point. Sometimes the term center of gravity (COG) is used in place of COM. Compliance: the opposite of stiffness is compliance. The more compliant the object, the easier it is to deform. Concentric: concentric muscle actions occur when muscles shorten under tension. Displacement: displacement is a change in position of a body. It can be translational, rotational, or a combination of both. Eccentric: eccentric muscle actions occur when muscles lengthen under tension (technically it’s not a contraction). EMG: EMG stands for electromyography and is a technique for recording and analyzing the electrical activity produced by skeletal muscles. Force: force equals mass times acceleration and is a vector quantity, meaning that it’s displayed in a particular direction. Force is usually measured in Newtons. Force-Velocity Curve: you can plot the force-velocity curve on a graph by plotting force on the y-axis and velocity on the x-axis. In strength & conditioning, the goal

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is to shift the curve upward and to the right so that the athlete can exhibit more force and power at every possible load. Heavy strength training tends to shift the
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