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Bradley C. Nindl

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Publications by Bradley C. Nindl (bibliography)

1995

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Sharp, Marilyn A., Rice, Valerie J., Nindl, Bradley C. and Mello, Robert P. (1995): Maximum Acceptable Load for Lifting and Carrying in Two-Person Teams. In: Proceedings of the Human Factors and Ergonomics Society 39th Annual Meeting 1995. pp. 640-644.

“The purpose of this study was to determine and verify the maximum acceptable load for lifting and carrying (MAL-L&C) in single- and mixed-gender two-person teams. Participants lifted and carried a box 7.2 meters and placed it on a 132 cm high shelf, at rates of 1 x/min and 4 x/min. All male teams lifted and carried significantly (p<.05) more weight than all female teams or mixed-gender teams, and mixed-gender teams carried more than all female teams (p>.05). Our findings demonstrate that 1) individuals working alone or in teams can accurately estimate their ability to lift and carry loads for an hour, and that 2) when working in pairs, team MAL-L&C are approximately equal to the sum of their individual MAL-L&C. Percentile norms for MAL-L&CS are provided for male, female, and mixed gender teams.”

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Rice, Valerie J., Sharp, Marilyn A., Nindl, Bradley C. and Bills, Randall K. (1995): Prediction of Two-Person Team Lifting Capacity. In: Proceedings of the Human Factors and Ergonomics Society 39th Annual Meeting 1995. pp. 645-649.

“Predictive models for team lifting capacity are important for task and equipment design, as well as worker selection and placement. The purpose of this study was to develop a prediction equation for single gender and mixed gender two-person team lifting from the floor to knuckle height. Men (n=23) and women (n=17) were combined into teams of two men (n=26), two women (n=24), and one man with one woman (n=25). Independent variables included incremental dynamic lift, 38 cm upright pull, dead lift, fat free mass, and body mass. A least squares linear regression was used. In addition, an equation was developed from deadlift strengths only. The lightest individual deadlift and the sum of the individual deadlifts were the best predictors of team lifting capacity (R{squared} = 0.90, SEE = 16). The results indicate that two-person team lifts to knuckle height are determined by the weaker team member.”

1992

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Rice, Valerie J., Sharp, Marilyn A., Williamson, Tania L. and Nindl, Bradley C. (1992): Effects of Gender, Lift Height, Direction, and Load on the Ability to Estimate Weight. In: Proceedings of the Human Factors Society 36th Annual Meeting 1992. pp. 669-673.

“The study evaluated the effects of gender, lift height, direction (lift/lower), and load on the ability to correctly estimate weight handled. Seven women and six men lifted and lowered boxes to and from knuckle, waist, and shoulder heights. Subjects were asked to estimate weights corresponding to 50, 40, 30, and 20% of gender specific lifting strength to 152 cm. The difference between the actual and estimated weight (DIFF) was 100% greater for men than for women (F = 6.27, p = 0.03). When the percent difference was analyzed, there was no significant gender effect. The least accurate estimates occurred when lowering a weight from knuckle height (p < 0.05). The majority of subjects underestimated the weight and men underestimated more frequently than women (Chi{squared} = 12.57, p = 0.0004). Subjects over-estimated the weight more often at higher weights. The results suggest that both men and women tend to underestimate weight, especially when lowering from knuckle height, possibly putting them at risk for injury.”

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