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KMID : 1142420180160020229
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PNF and Movement
2018 Volume.16 No. 2 p.229 ~ p.238
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Immediate Effects of Various Contract?Relax Techniques on the Peck Force and Range of Motion of Knee Extension -A Pilot Study-
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Shin Seung-Sub
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Abstract
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Purpose: This study aimed to compare the immediate effects of various contract?relax (CR) techniques on the peck force and passive range of motion (ROM) of knee extension.
Methods: This study recruited 17 adult males and females who obtained below 90° in straight leg raising. The subjects randomly performed one of three different CR techniques (direct CR, indirect CR, and modified CR) on the right knee extension four times per day for three days. The subjects’ peck force during each CR and their passive knee extension on the hip at a 90° flexed position before and after each CR were measured.
Results: The peck force was significantly higher in the direct and modified CR than in the indirect CR. The ROM in the passive knee extension significantly increased after direct and indirect CR. Comparing between each CR, the passive knee extension range was significantly more improved in the direct and indirect CR than in the modified CR.
Conclusion: Direct and indirect CR are more effective than modified CR in the ROM of passive knee extension. The study results suggest that the modified CR did not have the same effect on the ROM of the knee extension as the direct and indirect CR and that further research is needed to recruit more subjects and to determine the effects on different muscles after modified CR.
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KEYWORD
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Direct contract-relax, Indirect contract-relax, Modified contract-relax, Range of motion, Straight leg raising
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