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Effects of gloves and pulling task on achievable downward pull forces on a rung
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3 2018
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Source: Hum Factors. 60(2):191-200
[PDF-424.46 KB]
Details:
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Alternative Title:Hum Factors
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Personal Author:
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Description:Objective:
This study examined the impacts of pulling task (breakaway and pull-down tasks at different postures), glove use, and their interaction on achievable downward pull forces from a ladder rung.
Background:
Posture, glove use and the type of pulling task are known to impact the achievable forces. However, a gap in the literature exists regarding how these factors affect achievable downward pulling forces, which are relevant to recovery from a perturbation during ladder climbing.
Methods:
Forty subjects completed four downward pulling tasks (breakaway force; pull force at maximum height, shoulder height and a middle height), using three glove conditions with varying coefficient of friction (COF) levels (cotton glove, low COF; bare hand, moderate COF; and latex-coated glove, high COF) with their dominant and non-dominant hand. The outcome variable was the maximum force normalized to body weight.
Results:
The highest forces were observed for highest hand postures (breakaway and maximum height). Increased COF led to higher forces and had a larger effect on breakaway force than the other tasks. The dominant hand was associated with higher forces than the non-dominant hand. Male subjects generated greater forces than female subjects, particularly for higher hand positions.
Conclusion:
This study suggests that higher hand position on the ladder, while avoiding low-friction gloves, may be effective for improving recovery from ladder perturbations.
Application:
This study may guide preferred climbing strategies (particularly those that lead to a higher hand position) for improving recovery from a perturbation during ladder climbing.
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Source:
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Pubmed ID:29161154
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Pubmed Central ID:PMC8829586
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Funding:
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Volume:60
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Issue:2
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