Hand-rung forces after a ladder climbing perturbation.

Journal of Biomechanics
Erika M PlinerKurt E Beschorner

Abstract

The hands are believed to be important for arresting falls from ladders. Yet, there is a paucity of kinetic data for the hand-handhold interface during recovery from a ladder climbing perturbation. This study quantified the hand-rung forces utilized after ladder climbing perturbations and the factors (upper body strength, fall severity, reestablished foot placement) contributing to hand-rung force. A ladder rung was released under the foot of the participants to simulate a climbing misstep perturbation. Hand-rung forces after the perturbation were quantified from load cells connected to two ladder rungs. Mean peak hand-rung force magnitudes were found to range between 46% and 84% of the climber's body weight. These magnitudes approached and, in some cases, exceeded individuals' grasping capacity. Individual upper body strength was not found to consistently contribute to hand-rung force, but increased hand-rung force was clearly linked with greater fall severity after an ascending perturbation. Individuals that reestablished foot placement after an ascending perturbation utilized lower hand-rung forces. Therefore, this study suggests hand-rung force to be dependent on circumstances of the falling event (fall severity, reestablis...Continue Reading

References

Oct 24, 2001·Journal of Biomechanics·R Cham, M S Redfern
Oct 28, 2008·Applied Ergonomics·Donald O DusenberrySteven J Dellorusso
Jun 24, 2011·Journal of Biomechanics·Feng Yang, Yi-Chung Pai
Oct 4, 2015·Journal of Biomechanics·Alyssa J SchnorenbergKurt E Beschorner
Nov 22, 2017·Human Factors·Kurt E BeschornerNa Jin Seo
Nov 16, 2018·Gait & Posture·Erika M PlinerKurt E Beschorner
Nov 30, 2019·Journal of Biomechanics·Ellen R MartinKurt E Beschorner

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Citations

Jun 22, 2021·Applied Ergonomics·Elizabeth A Rapp van RodenRobert T Bove

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