Background and purpose: Magnetic fields have been widely used in diagnosis and treatment of diseases. The purpose of this study is to investigate the effects of magnets on nerve conduction studies (NCS) in human. Methods: After excluding subjects with peripheral neuropathy or diabetic neuropathy, 12 normal subjects were recruited (mean age is 30.0 ± 5.2 years old; 5 are female and 7 are male). Two magnets were individually placed on the left distal wrist crease and on the forearm 5 cm distal to the elbow crease, where the median nerve goes underneath. NCS was performed before and 15 minutes during application, and 10 minutes after removal of magnets. The NCS's include motor nerve conduction study (MNCS), sensory nerve conduction study (SNCS) and F-wave study of the median nerve. Results: The motor nerve conduction velocity (MNCV) and sensory nerve conduction velocity (SNCV) became slower. Distal latency and F-latency were prolonged and F-persistence showed a significant decrease during application of magnets. The effects persisted even 10 minutes after removal of magnets. The amplitudes of compound muscle action potential (CMAP) and sensory nerve action potential (SNAP) showed a trend of decrease but not significant statistically. The area of CMAP was also significantly decreased during application of magnets. Conclusions: We conclude that magnets have significant effects on NCS's in human.
|Translated title of the contribution||The Effects of Magnets on Nerve Conduction Studies in Human|
|Original language||Chinese (Traditional)|
|Number of pages||6|
|Publication status||Published - 2001|