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KMID : 0857020040190010217
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Kosin Medical Journal
2004 Volume.19 No. 1 p.217 ~ p.220
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The Effect on H-Reflex by TENS Site and Experimental Bias of H-Reflex Study
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Jeong Ho-Joong
Kim Ghi-Chan
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Abstract
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Background: This study was designed to research the influence of H-reflex according to applying site of TENS and experimental bias.
Materials and Methods: The H-reflexes were recorded in 40 normal healthy subjects by a standardized method of Braddom and Johnson. Two examiners measured H-reflex of each same subject. After TENS of 100Hz was applied for 15 minutes, and H-reflex were measured before and immediately after stimulation of TENS at popliteal fossa. H-reflex was measured to reveal change of each examiner bias by same time and method in next day. 30 healthy subject were measured before and after stimulate of TENS by same standardized method to investigate change of H-reflex according to applying site of TENS. Statistical analysis was done with paired t-test and student t-test of SPSS for window(version 10.0).
Result: 1) H-latency showed no inter-examiner bias, but H-amplitude showed intra-examiner bias on repeated test. These results suggest that H-latency can be used as a experimental value, but not H-amplitude. 2) H-latency after TENS therapy on popliteal fossa, soleus muscle, and lumbar area increased can be used as a useful experimental value, but the value of H-amplitude is questionable. 2. The effects of H-reflex on TENS therapy, prolonged H-latency after TENS therapy regardless of stimulus site, may be due to the effect of conduction block on nerve system.
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KEYWORD
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H-reflex, TENS, Experimental Bias
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