Measuring and Modeling Support Forces of People to Assist in the Development of the ASPECT Manikin Weighting

Bush, Tamara Reid; Gregg, Sarah J.; Hubbard, Robert P.

doi:10.4271/1999-01-0961

Cited by 5 publications

(2 citation statements)

References 2 publications

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“…The ischial tubercle is relatively thick with an area of 25 cm 2 under the pelvis, and there are fewer blood vessels and nerves distributed here. It can bear more pressure than the surrounding muscles to reduce nerve compression in other areas, avoiding muscle fatigue, cramping, and leg pain (Bush et al 1999).…”

Section: Hip Areamentioning

confidence: 99%

Ergonomics of a Chinese folk bamboo lounge chair

Cheng

Tor

et al. 2020

BioRes

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Bamboo is an environmentally friendly sustainable resource and is commonly used in furniture production in China. Limited research has been conducted in the field of ergonomics of bamboo furniture, which can greatly affect the seating experience. This study provides a qualitative and quantitative analysis of the main effects of seat surface curve, bending deflection of bamboo strips of seat, functions, and usability in a bamboo lounge chair provided in Zhejiang Province. The shape of the seat surface curve of the bamboo lounge chair included the seat-back angle of 134°, and the slope of the bamboo lounge chair seat was 16°. The deflection of bamboo strips of seat under vertical loading force of 336 N was 30.7 mm. In addition, the angles, deflection characteristic, and functions of the bamboo lounge chair were all human-centered design and suitable for human comfort, which can reduce maximum pressure and maintain normal lumbar spine curve in adult.

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Section: Hip Areamentioning

confidence: 99%

Ergonomics of a Chinese folk bamboo lounge chair

Cheng

Tor

et al. 2020

BioRes

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“…The current research adopted a similar principle to document the complex contours of the lumbar region as part of a simplified curve. Lastly, several researchers have developed various types of spinal models [14,16,[29][30][31] where the ribcage and pelvis were considered to act as two rigid bodies attached at either end of the lumbar spine. The research presented here also applies these assumptions.…”

Section: Background Researchmentioning

confidence: 99%

A Methodology for Quantifying Seated Lumbar Curvatures

Leitkam

Bush

2011

Journal of Biomechanical Engineering

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To understand the role seating plays in the support of posture and spinal articulation, it is necessary to study the interface between a human and the seat. However, a method to quantify lumbar curvature in commercially available unmodified seats does not currently exist. This work sought to determine if the lumbar curvature for normal ranges of seated posture could be documented by using body landmarks located on the anterior portion of the body. The development of such a methodology will allow researchers to evaluate spinal articulation of a seated subject while in standard, commercially available seats and chairs. Anterior measurements of boney landmarks were used to quantify the relative positions of the ribcage and pelvis while simultaneous posterior measurements were made of lumbar curvature. The relationship between the anterior and the posterior measures was compared. The predictive capacity of this approach was evaluated by determining linear and second-order regressions for each of the four postures across all subjects and conducting a leave-one-out cross validation. The relationships between the anterior and posterior measures were approximated by linear and second-order polynomial regressions (r(2 ) = 0.829, 0.935 respectively) across all postures. The quantitative analysis showed that openness had a significant relationship with lumbar curvature, and a first-order regression was superior to a second-order regression. Average standard errors in the prediction were 5.9° for the maximum kyphotic posture, 9.9° for the comfortable posture, 12.8° for the straight and tall, and 22.2° for the maximum lordotic posture. These results show predictions of lumbar curvature are possible in seated postures by using a motion capture system and anterior measures. This method of lumbar curvature prediction shows potential for use in the assessment of seated spinal curvatures and the corresponding design of seating to accommodate those curvatures; however, additional inputs will be necessary to better predict the postures as lordosis is increased.

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