Precision based guidelines for sub-maximal normalisation task selection for trunk extensor EMG
© 2017 The Authors Aim The object of this study was to quantify the contribution of sub-maximal normalisation to the overall variance of exposure parameters describing erector spinae (ES) activity, and to provide guidelines for task selection which minimize methodological variance. Methods ES EMG wa...
| Main Authors: | , , , |
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| Format: | Journal Article |
| Published: |
Elsevier Science Ltd
2017
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| Online Access: | http://hdl.handle.net/20.500.11937/69168 |
| _version_ | 1848761986034171904 |
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| author | Jackson, J. Mathiassen, Svend Callaghan, J. Dempsey, P. |
| author_facet | Jackson, J. Mathiassen, Svend Callaghan, J. Dempsey, P. |
| author_sort | Jackson, J. |
| building | Curtin Institutional Repository |
| collection | Online Access |
| description | © 2017 The Authors Aim The object of this study was to quantify the contribution of sub-maximal normalisation to the overall variance of exposure parameters describing erector spinae (ES) activity, and to provide guidelines for task selection which minimize methodological variance. Methods ES EMG was measured from three locations (T9, L1 and L5 levels) on fifteen men performing a manual materials handling task in the laboratory on three separate days. Four repeats of each of eleven sub-maximal normalisation tasks (eight static, three dynamic) were collected, work data were normalised to each task and repeat, and exposure parameters calculated. The unique contribution of normalisation to the overall variance was determined for each task and exposure parameter using variance component analyses. Normalisation tasks were scored according to their relative contributions to the overall variance and coefficients of variation. Results A prone task, similar to the Biering-Sørensen test posture, was the most repeatable for all electrode locations and across all exposure parameters. Thoracic level normalisation typically showed poorer repeatability than lumbar normalisation. Discussion To maximize measurement precision, we recommend that future ES EMG studies employing sub-maximal normalisation utilise said prone task. An alternate normalisation task specific to thoracic level ES muscles may be warranted. |
| first_indexed | 2025-11-14T10:40:23Z |
| format | Journal Article |
| id | curtin-20.500.11937-69168 |
| institution | Curtin University Malaysia |
| institution_category | Local University |
| last_indexed | 2025-11-14T10:40:23Z |
| publishDate | 2017 |
| publisher | Elsevier Science Ltd |
| recordtype | eprints |
| repository_type | Digital Repository |
| spelling | curtin-20.500.11937-691682018-06-29T12:36:00Z Precision based guidelines for sub-maximal normalisation task selection for trunk extensor EMG Jackson, J. Mathiassen, Svend Callaghan, J. Dempsey, P. © 2017 The Authors Aim The object of this study was to quantify the contribution of sub-maximal normalisation to the overall variance of exposure parameters describing erector spinae (ES) activity, and to provide guidelines for task selection which minimize methodological variance. Methods ES EMG was measured from three locations (T9, L1 and L5 levels) on fifteen men performing a manual materials handling task in the laboratory on three separate days. Four repeats of each of eleven sub-maximal normalisation tasks (eight static, three dynamic) were collected, work data were normalised to each task and repeat, and exposure parameters calculated. The unique contribution of normalisation to the overall variance was determined for each task and exposure parameter using variance component analyses. Normalisation tasks were scored according to their relative contributions to the overall variance and coefficients of variation. Results A prone task, similar to the Biering-Sørensen test posture, was the most repeatable for all electrode locations and across all exposure parameters. Thoracic level normalisation typically showed poorer repeatability than lumbar normalisation. Discussion To maximize measurement precision, we recommend that future ES EMG studies employing sub-maximal normalisation utilise said prone task. An alternate normalisation task specific to thoracic level ES muscles may be warranted. 2017 Journal Article http://hdl.handle.net/20.500.11937/69168 10.1016/j.jelekin.2017.07.001 Elsevier Science Ltd restricted |
| spellingShingle | Jackson, J. Mathiassen, Svend Callaghan, J. Dempsey, P. Precision based guidelines for sub-maximal normalisation task selection for trunk extensor EMG |
| title | Precision based guidelines for sub-maximal normalisation task selection for trunk extensor EMG |
| title_full | Precision based guidelines for sub-maximal normalisation task selection for trunk extensor EMG |
| title_fullStr | Precision based guidelines for sub-maximal normalisation task selection for trunk extensor EMG |
| title_full_unstemmed | Precision based guidelines for sub-maximal normalisation task selection for trunk extensor EMG |
| title_short | Precision based guidelines for sub-maximal normalisation task selection for trunk extensor EMG |
| title_sort | precision based guidelines for sub-maximal normalisation task selection for trunk extensor emg |
| url | http://hdl.handle.net/20.500.11937/69168 |