An Enhanced Planar Linked Segment Model for Predicting Lumbar Spine Loads during Symmetric Lifting Tasks
The present technical note aimed at enriching the planar linked segment model originally proposed by Chaffin with the prediction of the moment arm and of the orientation of the line of action of the back extensor muscles during symmetric lifting tasks. The prediction equations proposed by van Dieen...
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| Format: | Article |
| Language: | English |
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MDPI AG
2020-09-01
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| Series: | Applied Sciences |
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| Online Access: | https://www.mdpi.com/2076-3417/10/19/6700 |
| _version_ | 1797552635695333376 |
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| author | Pietro Picerno |
| author_facet | Pietro Picerno |
| author_sort | Pietro Picerno |
| collection | DOAJ |
| description | The present technical note aimed at enriching the planar linked segment model originally proposed by Chaffin with the prediction of the moment arm and of the orientation of the line of action of the back extensor muscles during symmetric lifting tasks. The prediction equations proposed by van Dieen and de Looze for their single equivalent muscle model were used for such a purpose. Their prediction was based on the thorax-to-pelvis flexion angle as computed from 3D video-based motion capture. In order to make these prediction equations compliant with a two-dimensional analysis, the planar angle formed by the segment joining L5/S1 to the shoulder with the longitudinal axis of the pelvis was introduced. This newly computed planar trunk flexion angle was used to feed van Dieen and de Looze’s equations, comparing the results with the original model. A full-body Plug-in-Gait model relative to 10 subjects performing manual lifting activities using a stoop and a squat technique was used for model validation. A strong association was found between the proposed planar trunk flexion angle and that used by van Dieen and de Looze (r = 0.970). A strong association and a high level of agreement were found between the back extensor muscle moment arm (r = 0.965; bias < 0.001 m; upper limit of agreement (LOA) = 0.002 m; lower LOA < 0.001 m) and the orientation of the line of action (r = 0.970; bias = 2.8°; upper LOA = 5.3°; lower LOA = 0.2°) as computed using the two methods. For both the considered variables, the prediction error fell within the model sensitivity. |
| first_indexed | 2024-03-10T16:03:52Z |
| format | Article |
| id | doaj.art-95ed5f4c29db40f2b5f1ce3a8e3eb5b2 |
| institution | Directory Open Access Journal |
| issn | 2076-3417 |
| language | English |
| last_indexed | 2024-03-10T16:03:52Z |
| publishDate | 2020-09-01 |
| publisher | MDPI AG |
| record_format | Article |
| series | Applied Sciences |
| spelling | doaj.art-95ed5f4c29db40f2b5f1ce3a8e3eb5b22023-11-20T15:04:21ZengMDPI AGApplied Sciences2076-34172020-09-011019670010.3390/app10196700An Enhanced Planar Linked Segment Model for Predicting Lumbar Spine Loads during Symmetric Lifting TasksPietro Picerno0SMART Engineering Solutions & Technologies (SMARTEST) Research Center, Università Telematica “eCampus”, Via Isimbardi, 10, 22060 Novedrate, ItalyThe present technical note aimed at enriching the planar linked segment model originally proposed by Chaffin with the prediction of the moment arm and of the orientation of the line of action of the back extensor muscles during symmetric lifting tasks. The prediction equations proposed by van Dieen and de Looze for their single equivalent muscle model were used for such a purpose. Their prediction was based on the thorax-to-pelvis flexion angle as computed from 3D video-based motion capture. In order to make these prediction equations compliant with a two-dimensional analysis, the planar angle formed by the segment joining L5/S1 to the shoulder with the longitudinal axis of the pelvis was introduced. This newly computed planar trunk flexion angle was used to feed van Dieen and de Looze’s equations, comparing the results with the original model. A full-body Plug-in-Gait model relative to 10 subjects performing manual lifting activities using a stoop and a squat technique was used for model validation. A strong association was found between the proposed planar trunk flexion angle and that used by van Dieen and de Looze (r = 0.970). A strong association and a high level of agreement were found between the back extensor muscle moment arm (r = 0.965; bias < 0.001 m; upper limit of agreement (LOA) = 0.002 m; lower LOA < 0.001 m) and the orientation of the line of action (r = 0.970; bias = 2.8°; upper LOA = 5.3°; lower LOA = 0.2°) as computed using the two methods. For both the considered variables, the prediction error fell within the model sensitivity.https://www.mdpi.com/2076-3417/10/19/6700single equivalent muscle modelmanual liftinglumbar spinecompression forceshear forceergonomics |
| spellingShingle | Pietro Picerno An Enhanced Planar Linked Segment Model for Predicting Lumbar Spine Loads during Symmetric Lifting Tasks Applied Sciences single equivalent muscle model manual lifting lumbar spine compression force shear force ergonomics |
| title | An Enhanced Planar Linked Segment Model for Predicting Lumbar Spine Loads during Symmetric Lifting Tasks |
| title_full | An Enhanced Planar Linked Segment Model for Predicting Lumbar Spine Loads during Symmetric Lifting Tasks |
| title_fullStr | An Enhanced Planar Linked Segment Model for Predicting Lumbar Spine Loads during Symmetric Lifting Tasks |
| title_full_unstemmed | An Enhanced Planar Linked Segment Model for Predicting Lumbar Spine Loads during Symmetric Lifting Tasks |
| title_short | An Enhanced Planar Linked Segment Model for Predicting Lumbar Spine Loads during Symmetric Lifting Tasks |
| title_sort | enhanced planar linked segment model for predicting lumbar spine loads during symmetric lifting tasks |
| topic | single equivalent muscle model manual lifting lumbar spine compression force shear force ergonomics |
| url | https://www.mdpi.com/2076-3417/10/19/6700 |
| work_keys_str_mv | AT pietropicerno anenhancedplanarlinkedsegmentmodelforpredictinglumbarspineloadsduringsymmetricliftingtasks AT pietropicerno enhancedplanarlinkedsegmentmodelforpredictinglumbarspineloadsduringsymmetricliftingtasks |