Effects of gloves and pulling task on achievable downward pull forces on a rung
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Effects of gloves and pulling task on achievable downward pull forces on a rung

Filetype[PDF-424.46 KB]

  • English

  • Details:

    • Alternative Title:
      Hum Factors
    • Description:

      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.


      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.


      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.


      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.


      This study suggests that higher hand position on the ladder, while avoiding low-friction gloves, may be effective for improving recovery from ladder perturbations.


      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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