Temporal relationships of load and lumbar spine kinematics during lifting

MacKinnon, Scott; Li, Jian-Chuan

doi:10.1016/s0169-8141(97)00089-9

Cited by 2 publications

(2 citation statements)

References 15 publications

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“…Or in the case of Chowdhury et al (2018) it could due to studying multiple lumbar segments (L2/L3, L3/L4, L5/S1). While the studies reporting no-significant results used relatively light load conditions (<16 kg), with the exception of MacKinnon and Li (1998) with a maximal load of 66% of bodyweight but a sample size of five males. The small range in peak flexion from lighter to heavier load conditions may be due to participants trying to maintain an upright position of the torso in order to get lower in the squat position to transfer the heavy loads closer to the body’s midline.…”

Section: Discussionmentioning

confidence: 99%

“…Some studies reporting a significant decrease in angle with an increase in load ( Scholz et al, 1995 ; Mirka and Baker, 1996 ; Melino et al, 2014 ; West et al, 2018 ); others report a significant increase in angle with an increase in load ( Van Der et al, 2000 ; Song and Qu, 2014a ; Song and Qu, 2014b ; Elsayed et al, 2015 ). This could be because studies into kinematic changes for manual handling tasks used discrete features [e.g., peak, minimum, mean, range of motion (ROM)] ( Allread et al, 1996 ; MacKinnon and Li, 1998 ; Gatton and Pearcy, 1999 ; Davis and Marras, 2000 ; Zhang et al, 2003 ; Song and Qu, 2014a ; Song and Qu, 2014b ; West et al, 2018 ) and/or time periods (e.g., start, middle, end) ( Scholz et al, 1995 ; Allen et al, 2012 ; Song and Qu, 2014a ; Song and Qu, 2014b ; Melino et al, 2014 ; Antwi-Afari et al, 2018 ; West et al, 2018 ) to explore the relationship between increased load and spine kinematics. The most commonly used discrete features were peak, mean and ROM and the variables analysed were trunk/lumbar angle, angular velocity and acceleration.…”

Section: Introductionmentioning

confidence: 99%

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The highs and lows of lifting loads: SPM analysis of multi-segmental spine angles in healthy adults during manual handling with increased load

Proud,

Garofolini,

Mudie

et al. 2024

Front. Bioeng. Biotechnol.

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Introduction: Manual handling personnel and those performing manual handling tasks in non-traditional manual handling industries continue to suffer debilitating and costly workplace injuries. Smart assistive devices are one solution to reducing musculoskeletal back injuries. Devices that provide targeted assistance need to be able to predict when and where to provide augmentation via predictive algorithms trained on functional datasets. The aim of this study was to describe how an increase in load impacts spine kinematics during a ground-to-platform manual handling task. Methods: Twenty-nine participants performed ground-to-platform lifts for six standardised loading conditions (50%, 60%, 70%, 80%, 90%, and 100% of maximum lift capacity). Six thoracic and lumbar spine segments were measured using inertial measurement units that were processed using an attitude-heading-reference filter and normalised to the duration of the lift. The lift was divided into four phases weight-acceptance, standing, lift-to-height and place-on-platform. Statistical significance of sagittal angles from the six spine segments were identified through statistical parametric mapping one-way analysis of variance with repeated measures and post hoc paired t-tests.Results: Two regions of interest were identified during a period of peak flexion and a period of peak extension. There was a significant increase in spine range of motion and peak extension angle for all spine segments when the load conditions were increased (p < 0.001). There was a decrease in spine angles (more flexion) during the weight acceptance to standing phase at the upper thoracic to upper lumbar spine segments for some condition comparisons. A significant increase in spine angles (more extension) during the place-on-platform phase was seen in all spine segments when comparing heavy loads (>80% maximum lift capacity, inclusive) to light loads (<80% maximum lift capacity) (p < 0.001).Discussion: The 50%–70% maximum lift capacity conditions being significantly different from heavier load conditions is representative that the kinematics of a lift do change consistently when a participant’s load is increased. The understanding of how changes in loading are reflected in spine angles could inform the design of targeted assistance devices that can predict where and when in a task assistance may be needed, possibly reducing instances of back injuries in manual handling personnel.

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Section: Discussionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

The highs and lows of lifting loads: SPM analysis of multi-segmental spine angles in healthy adults during manual handling with increased load

Proud,

Garofolini,

Mudie

et al. 2024

Front. Bioeng. Biotechnol.

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Predicting the lumbosacral joint centre location from palpable anatomical landmarks

Murphy

Bull

McGregor

2011

Proc Inst Mech Eng H

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The kinematics of the lumbar spine have previously been described by considering the bearing of the pelvis and lower back. However earlier studies have not described an intersegmental angle measured about a single point; which is necessary for investigation into movement, posture and balance, and lower back pain and injury. This study used computed tomography (CT) scans of 16 pelves to determine the location of palpable bony landmarks, and the junction of the fifth lumbar and first sacral vertebrae within a pelvis axis system. Data were used to derive equations which express the three-dimensional location of the lumbosacral joint centre as an offset from palpable surface landmarks. The magnitude of X, Y, Z offsets was controlled using individual pelvic geometry, and robustness and repeatability of the method was assessed. Regression equations provided the location of the lumbosacral junction to within 8.2mm (+/- 3.4mm) of its true coordinate. Leave-one-out analyses calculated equation coefficients using 15 of the original pelves, with the 16th acting as a control; average errors increased by 6.7 per cent (+/- 0.1 percent). To the authors' knowledge the current method is the most accurate non-invasive means of locating the lumbosacral junction and may be useful for constructing biomechanical models.

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Temporal relationships of load and lumbar spine kinematics during lifting

Cited by 2 publications

References 15 publications

The highs and lows of lifting loads: SPM analysis of multi-segmental spine angles in healthy adults during manual handling with increased load

The highs and lows of lifting loads: SPM analysis of multi-segmental spine angles in healthy adults during manual handling with increased load

Predicting the lumbosacral joint centre location from palpable anatomical landmarks

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