Concentric needle jitter on voluntary activated frontalis in 20 healthy subjects |
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| Authors: | João A. Kouyoumdjian MD PhD Erik V. Stålberg MD PhD |
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| Affiliation: | 1. Faculdade de Medicina de S?o José do Rio Preto (FAMERP), Department of Neurological Sciences, , 15025‐020 S?o José do Rio Preto, S?o Paulo, Brazil;2. Department of Clinical Neurophysiology, University Hospital, Institute of Neuroscience Uppsala University, , Uppsala, Sweden |
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| Abstract: | Introduction: Normative data for jitter parameters using a disposable concentric needle have been described in a few studies. Methods: Jitter, expressed as the mean consecutive difference (MCD), was measured in the frontalis muscle in 20 subjects by voluntary contraction. Results: Mean MCD for individual studies (20, Gaussian), all potentials (400, non‐Gaussian), and 18th highest value (20, Gaussian) were 19.9 ± 2.9 μs, 19.9 ± 6.6 μs, and 26.9 ± 4.4 μs, respectively. Conclusion: The suggested upper normal limit for mean MCD is 26 μs and for outliers is 36 μs. Muscle Nerve 47:440‐442, 2013 |
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| Keywords: | concentric needle electrode frontalis jitter single‐fiber electromyography voluntary jitter |
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