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| | Electromyographic activity of the ECU muscle changes with exposure to repetitive ulnar deviation |
 | | With little known about the changes of muscle physiology due to repetitive work during an eight-hour workday, our objective was to quantify changes in muscle activity due to this type of work. |
 | | Electromyographic (EMG) activity of the extensor carpi ulnaris muscle (ECU) was recorded during voluntary isometric contractions (20% and 60% MVC) eight times throughout the work and control days at 0, 2, 4.25, 6.75, 8, 9, 10, and 11 hours. |
 | | Initial median frequency of the EMG signal showed no change between the control and workdays (p = 0.51); however, the decline of the median frequency with respect to time over the course of each isometric contraction was steeper during workdays compared to control days (p = 0.003). |
| www.hsph.harvard.edu /ergonomics/hobs/electromyographic.htm (266 words) |
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