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KMID : 1195020180140020045
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Archives of Orthopedic and Sports Physical Therapy
2018 Volume.14 No. 2 p.45 ~ p.53
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Effects of Muscle Activity and Muscle Strength According to Verbal Command Volume in Isokinetic and Isometric Exercise of Quadriceps
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Lee Hyoung-Soo
Kim Yoon-Hwan
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Abstract
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Purpose: The purpose of this study was to investigate the effects of muscle activity and muscle strength according to verbal command volume during isokinetic and isometric quadricep exercises.
Methods: To measure muscle activity and muscle strength, surface electrodes were attached to the participants, as they sat on a Biodex chair. The isometric exercise was performed three times, with maximum exercise at 30° bending angle, based on a maximum extension state of the knee at 0°. The average holding time was unified to three seconds. In addition, the isokinetic exercise was performed three times, at 60°/sec. The verbal command ranged between 0∽60 dB and 0∽75 dB. Muscle activity was measured using surface electromyography (4D-MT, Relive, Gimhae, Korea). The Biodex System 4 was used to measure the isometric and isokinetic strength of the nodal line, and 4D-MT was used tomeasure muscle activity.
Results: There were significant improvements in the maximal and relative muscle strengths, when the 0∽ 60 dB and 0∽75 dB verbal commands were applied with isokinetic extension/flexion (p<.05). The isokinetic exercise (0∽75 dB) group showed a significant difference in the vastus medialis oblique muscle activity change (p<.05), while the isometric exercise (0∽75 dB) group showed a significant difference in the rectus femoris muscle activity change (p<.05).
Conclusions: Our results reveal that verbal commands effectively improve muscle activity and muscle strength during isokinetic and isometric quadricep exercises.
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KEYWORD
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Verbal command, Quadriceps muscle, Isokinetic exercise, Isometric exercise, Muscle strength, Muscle activity
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