Effects of postural and visual stressors on myofascial trigger point development and motor unit rotation during computer work Jeffrey A. Hoyle, William.

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Effects of postural and visual stressors on myofascial trigger point development and motor unit rotation during computer work Jeffrey A. Hoyle, William S. Marras, James E. Sheedy, Dennis E. Hart Journal of Electromyography and Kinesiology Volume 21, Issue 1, Pages 41-48 (February 2011) DOI: 10.1016/j.jelekin.2010.04.006 Copyright © 2010 Terms and Conditions

Fig. 1 Depiction of three experimental conditions (from left to right, VL/PL, VH/PL, VL/PH). Journal of Electromyography and Kinesiology 2011 21, 41-48DOI: (10.1016/j.jelekin.2010.04.006) Copyright © 2010 Terms and Conditions

Fig. 2 Placement of surface electrode array (14 channels) over trapezius muscle. Channel 7 records EMG data directly over the trigger point location, as determined by myofascial specialist. Journal of Electromyography and Kinesiology 2011 21, 41-48DOI: (10.1016/j.jelekin.2010.04.006) Copyright © 2010 Terms and Conditions

Fig. 3 EMG analysis and FFT processing illustration to calculate the running means of the median frequencies. FFT=Fast Fourier Transform. Journal of Electromyography and Kinesiology 2011 21, 41-48DOI: (10.1016/j.jelekin.2010.04.006) Copyright © 2010 Terms and Conditions

Fig. 4 Average median frequency cycles (across all spatial locations combined) as a function of condition. Whiskers=1 standard deviation. Results showed that all three conditions were significantly different from one another. Journal of Electromyography and Kinesiology 2011 21, 41-48DOI: (10.1016/j.jelekin.2010.04.006) Copyright © 2010 Terms and Conditions

Fig. 5 Average median frequency cycles (across all subjects) as a function of muscle spatial location (relative to MTrP). Location highlighted in red represents the MTrP location. Green (lighter) locations represent locations that are significantly different from MTrP location (p<0.05). Grey discs indicate electrode placement while the dotted lines represent muscle striation lines. Journal of Electromyography and Kinesiology 2011 21, 41-48DOI: (10.1016/j.jelekin.2010.04.006) Copyright © 2010 Terms and Conditions

Fig. 6 Mean VAS scores for neck/backache (post–pre) as a function of condition. Whiskers=1 standard deviation. Results showed that VL/PL and VL/PH conditions were significantly different; however, VH/PL condition was not significantly different from the other two conditions. Journal of Electromyography and Kinesiology 2011 21, 41-48DOI: (10.1016/j.jelekin.2010.04.006) Copyright © 2010 Terms and Conditions