Publicação: Electromyographic behaviour of the gastrocnemius muscle during knee extension and flexion performed on the leg press
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The gastrocnemius was analysed in 10 male volunteers during knee flexion and extension with the foot in normal, plantar flexion and dorsal flexion positions. Hewlett-Packard surface electrodes, an electromyographic signal amplifier, a computer equipped with an AID conversion plaque (Model CAD 10/26), a software specially designed to record and analyse the signals, a horizontal leg press, and electrogoniometers were used. The gastrocnemius muscle showed strong potentials at the end of knee extension and beginning of knee flexion. The muscle presented a similar activity both in the zipper and lower platforms. As to bilateral action, the right gastrocnemius presented stronger potentials on the upper platforms, whereas the potentials were bilaterally similar on the lower platforms. As for foot position, the gastrocnemius presented strong potentials when the foot was in plantar flexion. The remaining positions had no effect on the work of the muscle.
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computer program, controlled study, electromyography, foot, gastrocnemius muscle, goniometry, human, human experiment, knee function, male, muscle contraction, muscle exercise, muscle hypertrophy, muscle potential, normal human, Adult, Electromyography, Functional Laterality, Humans, Isometric Contraction, Knee, Male, Muscle, Skeletal, Reference Values, Weight-Bearing
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Inglês
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Electromyography and Clinical Neurophysiology, v. 39, n. 6, p. 367-377, 1999.
