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BSL PRO Lesson H17 - Biopac

BSL PRO Lesson H17 - Biopac

BSL PRO Lesson H17 -

Updated 01-07-11 BSL PRO Lesson H17: Biomechanics (Goniometry & EMG) Overview Goniometers are devices capable of transforming angular position into a proportional electrical signal. They incorporate gauge elements that measure bending strain along or around a particular axis. The bending strain is proportional to the sum total angular shift along the axis. Because the bending force is extremely small, the output signal is uniquely a proportional function of the angular shift. The twin-axis goniometers used in this study are dual output devices that can simultaneously measure angular rotation about two orthogonal planes. A goniometer for humans is used to determine the position of a moveable joint and the available range and quality of motion at the joint. Goniometry is useful in assessing abnormalities in joint movement associated with disease, developing treatment strategies and goals, and evaluating progress toward those goals. The combination of goniometry and electromyography (EMG) is prevalent in strength and conditioning studies. Strength can be defined as the ability of a muscle to produce or resist a physical force. Force generated during muscle contraction can be static (force producing no movement), as in isometric contraction, or dynamic (force producing movement), as in isotonic contraction. Dynamic contractions occur when there is visible joint movement and may be classified as either concentric or eccentric muscle contraction. Concentric contraction occurs if the resistance is less than the force produced by the muscle group. This type of contraction allows the muscle to shorten as it exerts tension (e.g. slowly raising a dumbbell). Eccentric contraction occurs when the muscle produces a braking force to decelerate rapidly moving body segments or to resist gravity. The lowering of a dumbbell is an example of an eccentric contraction. www.biopac.com Page 1 of 7

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