Publication statistics

Pub. period:1976-2010
Pub. count:8
Number of co-authors:13


Number of publications with 3 favourite co-authors:

Gary Don Langolf:
George B. Page:
James A. Foulke:



Productive colleagues

Don B. Chaffin's 3 most productive colleagues in number of publications:

Marc L. Resnick:14
Maury A. Nussbaum:7
Matthew P. Reed:5

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Don B. Chaffin


Publications by Don B. Chaffin (bibliography)

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Jones, Monica L. H., Reed, Matthew P. and Chaffin, Don B. (2010): The Effect of Bracing Availability on Force-Exertion Capability in One-Hand Isometric Pulling Tasks. In: Proceedings of the Human Factors and Ergonomics Society 54th Annual Meeting 2010. pp. 1169-1173.

In activities of daily living and industrial tasks people encounter obstructions in their environment that kinematically limit the postures that they can achieve. These obstructions can also provide an opportunity for additional support such as bracing with the hand, thigh or other body part. The reaction forces acting at hand or body coupling, which are in addition to those acting at the feet and task hand, may support some percentage of body weight, allow modification to postural behavior strategies, or provide the ability to generate oppositional forces relative to the task force. The effects of kinematic constraints and associated bracing opportunities on isometric hand force were quantified in a motion-capture study of 25 men and women with a range of body size. The objective of this work was to quantify the effect of bracing availability on force-exertion capability. Analyses of one-hand maximal pulling tasks demonstrated that the additional force reaction surfaces enable participants to exert more force at the task hand, by 31% on average, but these values were greatly affected by the location and utility of the constraint and the specified force direction.

© All rights reserved Jones et al. and/or HFES

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Nussbaum, Maury A., Chaffin, Don B. and Page, George B. (1995): A Biomechanical Investigation of the Asymmetric Multiplier in the Revised NIOSH Lifting Equation. In: Proceedings of the Human Factors and Ergonomics Society 39th Annual Meeting 1995. pp. 709-713.

There is growing evidence, from epidemiological and biomechanical sources, that lifting performed in asymmetric postures is a risk factor for the development of a musculoskeletal injury. In the recent update of the NIOSH Lifting Guide, a linear Asymmetric Multiplier was added to account for this type of risk. The present study addresses the form of this Multiplier through analysis of several asymmetric lifting tasks. Both spinal loading and a derived metric of muscle injury risk were calculated as a function of asymmetry angle. The results suggest that there is a non-linear increase in injury risk with respect to asymmetry. Only moderate increases in risk were predicted for asymmetry of 0{deg}-30{deg}, and sharply increasing risk as asymmetry reaches 90{deg}, implying that ergonomic intervention should be concentrated on tasks with the highest asymmetries.

© All rights reserved Nussbaum et al. and/or Human Factors Society

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Chaffin, Don B., Woolley, Charles B., Buhr, Trina and Verbrugge, Lois (1994): Age Effects in Biomechanical Modeling of Static Lifting Strengths. In: Proceedings of the Human Factors and Ergonomics Society 38th Annual Meeting 1994. pp. 658-661.

There is growing awareness that age results in reduced strengths in the population, and that significant decreases start in the 5th decade. The magnitude of the decrease in strength depends on the specific muscle function being tested. Because of differential effects it is not clear how various decreases could alter whole-body strength performance. This paper describes how specific strength decreases measured in an older population of men and women could affect their whole-body exertion capabilities in selected scenarios. A computerized strength prediction program is used to both predict the whole-body strength changes with age, and to study how older populations can alter their postures to achieve maximum exertion capability. The results indicate that different muscle group strengths decline by 5% to 70% with age, depending on which muscle group is tested. These changes have profound effects on whole-body exertion capabilities, which also are shown to depend on specific postures used to perform the exertions.

© All rights reserved Chaffin et al. and/or Human Factors Society

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Kerk, Carter J. and Chaffin, Don B. (1993): Evaluation of Limiting Strength Constraints in a Comprehensive Biomechanical Model. In: Proceedings of the Human Factors and Ergonomics Society 37th Annual Meeting 1993. pp. 739-743.

The strength constraints in a two-dimensional static human force exertion capability model (HFEC) have been evaluated using eight male and female subjects of varying anthropometry and strength capability. The model comprehensively estimates feasible exertion capability under symmetric conditions using a set of fifteen linear constraint equations from three constraint classes: strength, stability, and coefficient of friction (COF). This evaluation examines the nature of the limiting strength constraints. The computer model aided in designing tasks (combining posture with force exertion direction) that isolated upper extremity strength constraints and hip/torso strength constraints from stability and COF constraints. Subject performances of maximum exertions were recorded using force platforms and a multi-axis load cell to record external reaction forces at the hands and feet. Body posture was recorded with a 2D motion analysis system. The observed hand force exertions were compared to the exertions predicted by the model. The identity of the limiting constraints was well predicted by the model. The location of the constraints was logical and predictable. The results are discussed in the context of other modeling approaches as well as implications for future research. The HFEC approach shows excellent potential as an ergonomic engineering tool for teaching, evaluation, and design.

© All rights reserved Kerk and Chaffin and/or Human Factors Society

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Thompson, Deborah D. and Chaffin, Don B. (1993): Can Biomechanically Determined Stress be Perceived?. In: Proceedings of the Human Factors and Ergonomics Society 37th Annual Meeting 1993. pp. 789-792.

Back and overexertion injuries are a costly and debilitating problem in industry. It has been suggested that the best protective action in the prevention of back injuries is to rely on a person's perception of the risks, and allow them to operate within them. However, this assumes that a person is aware of the sensory information from the body concerning unsafe levels of stress, particularly in the back. Unfortunately, there is some question as to whether this assumption is valid. The purpose of this study was to determine how well physical stress resulting from performing occasional lifting exertions could be perceived. This required an evaluation to determine how perception (psychophysical approach) relates to physical tolerances (biomechanical approach). The results showed that back stress resulting from occasional lifting exertions is not well perceived in general. The fact that the stress was not well perceived by some may indicate why low back injuries are so pervasive in the population, and why engineering and ergonomic changes are needed to reduce the exposure to conditions that would overstress the back.

© All rights reserved Thompson and Chaffin and/or Human Factors Society

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Resnick, Marc L. and Chaffin, Don B. (1992): Some Ergonomic Considerations in the Design of Material Handling Devices. In: Proceedings of the Human Factors Society 36th Annual Meeting 1992. pp. 644-648.

Material handling devices (MHD's) are being proliferated in factory workplaces to prevent workers from being injured due to the lifting of heavy loads. These devices require exertions which have not been adequately studied from an ergonomic perspective. Jobs with MHDs often require complex 3-dimensional movements and loaded axial rotation. One type of MHD, an articulated arm, was used to investigate the effects of inertial load, arm joint friction, and positioning accuracy requirements. The kinematic variables of peak push and pull hand forces, velocities, and accelerations were measured or computed in both a task that allowed sagittally symmetric postures as well as one in which loaded axial torso rotation was required. Greater inertial loads increased the peak push and pull hand forces in all cases by an average

© All rights reserved Resnick and Chaffin and/or Human Factors Society

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Resnick, Marc L., Chaffin, Don B. and Erig, Muzaffer (1991): Biomechanical Analysis of Horizontal Movement Strategies in the Sagittal Plane. In: Proceedings of the Human Factors Society 35th Annual Meeting 1991. pp. 785-789.


© All rights reserved Resnick et al. and/or Human Factors Society

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Langolf, Gary Don, Chaffin, Don B. and Foulke, James A. (1976): An Investigation of Fitts' Law Using a Wide Range of Movement Amplitudes. In Journal of Motor Behavior, 8 pp. 113-128.

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