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Ann Baker

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Publications by Ann Baker (bibliography)

1995

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Kelaher, Dan, Mirka, Gary, Baker, Ann, Harrison, Angela and Davis, Joe (1995): Selective Activation of the External Obliques during Twisting. In: Proceedings of the Human Factors and Ergonomics Society 39th Annual Meeting 1995. pp. 610-614.

“This study investigated selective activation of different regions of the external obliques. Six subjects performed sub-maximal isometric axial twisting”

1994

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Mirka, Gary A. and Baker, Ann (1994): An Investigation of the Variability in Human Performance during Manual Material Handling Activities. In: Proceedings of the Human Factors and Ergonomics Society 38th Annual Meeting 1994. pp. 578-582.

“The goal of this study was to quantify the variability of the three-dimensional kinematic and kinetic parameters describing the motion of the torso during the performance of sagittally symmetric lifting tasks. Subjects performed eight repetitions of simple lifting tasks described by three levels of coupling (poor, fair and good) and seven levels of load (4.5, 9, 13.5, 18, 22.5, 27 and 31.5 kg). The three-dimensional, time dependent position, velocity and acceleration of the lumbar spine were monitored using the Lumbar Motion Monitor. These measures were then input into a dynamic biomechanical model which calculated torque about the L5/S1 joint in the sagittal plane. The results of the kinematic analysis showed significant variability in the magnitude of the peak velocity and acceleration in the sagittal plane and also showed significant motion in the transverse and coronal planes. The kinetic analysis showed an increase in the variability of the peak dynamic torque with greater levels of load but no coupling effect.”

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Mirka, Gary, Baker, Ann, Harrison, Angela, Kelaher, Dan and Davis, Joseph (1994): A Study of the Interaction between Load and Coupling during Lifting. In: Proceedings of the Human Factors and Ergonomics Society 38th Annual Meeting 1994. pp. 644-648.

“The National Institute for Occupational Safety and Health (NIOSH) has increased the applicability of its lifting equation to a wider range of jobs by relaxing some of the simplifying assumptions of the original equation. Specifically, NIOSH has added an asymmetry factor and a coupling factor in the revised lifting equation. Two of the remaining simplifications, however, are that (1) interactions between terms are not considered and (2) the biomechanical analysis still utilizes a static modelling approach in its calculations. The purpose of the present research was to investigate the interaction between coupling and load magnitude under dynamic lifting conditions. Subjects lifted a box under various combinations of coupling and load. The dependent variables in this study were the peak external moment about the lumbosacral joint (as calculated by a dynamic biomechanical model) and the peak vertical ground reaction forces. The results show that at low levels of load there was little difference in peak torque across the different coupling conditions. However, when loads greater than 13.5 kg were combined with poor coupling, there was a fundamental change in the dynamics of the lifting motion. The results of this study indicate that the role of coupling under dynamic lifting conditions has both a perceptual and biomechanical effect which should be considered when designing manual materials handling tasks.”

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