Repeatability of electromyography normalization of the neck and shoulder muscles in symptomatic office workers |
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Authors: | Montakarn Chaikumarn Nuttika Nakphet Prawit Janwantanakul |
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Institution: | 1. Faculty of Allied Health Sciences, Chulalongkorn University, Thailand;2. Faculty of Physical Therapy, Rangsit University, Thailand |
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Abstract: | Purpose. The purpose of the study was to examine the repeatability of electromyography (EMG) normalization in office workers with neck and shoulder symptoms. Methods. Fifteen female office workers with neck/shoulder symptoms were recruited to participate in two separate days of testing. Maximum voluntary isometric contraction (MVIC) was used for the normalization of EMG data on the following muscles: cervical erector spinae, upper trapezius, lower trapezius and anterior deltoid. Repeatability was calculated using the intra-class correlation (ICC), relative standard error of measurement (%SEM) and relative coefficient of variation (%CV). Results. Peak root mean square (rms) and median frequency (MF) showed good to high repeatability in the UT, AD and CES (ICC?=?0.87–0.95, %SEM=?2.65–9.48, %CV=?0.2–5.9). The repeatability of peak rms was good (ICC?=?0.87, %SEM?=?12.56, %CV?=?3.3) and the MF of the LT was fair (ICC?=?0.76, %SEM?=?5.71, %CV?=?2.9). Conclusion. Peak rms and MF from the MVIC normalization method can be measured with sufficient repeatability in symptomatic office workers. |
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Keywords: | electromyography repeatability symptomatic office workers normalization |
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