Posture effect on seating interface biomechanics: Comparison between two seating cushions

Koo, Terry K.; Mak, Arthur F. T.; Lee, Y.L.

doi:10.1016/s0003-9993(96)90218-x

Cited by 88 publications

(60 citation statements)

References 4 publications

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“…During sitting, the upper body weight is transferred mainly to the ischial tuberosities 30) . The interfacial pressure on the gluteal area and lower back is dependent on sitting posture 31,32) and body positioning 31) . The decreased activity of the muscles that are involved in positioning has been shown to increase the load on the bones and ligaments 33) .…”

Section: Discussionmentioning

confidence: 99%

Changes in Craniocervical and Trunk Flexion Angles and Gluteal Pressure during VDT Work with Continuous Cross‐legged Sitting

Lee

Park

Yoo

2011

Journal of Occupational Health

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The gluteal pressures of ten VDT workers, who were recruited from laboratories, were measured using a Teckscan system and videotaped using a single video camera to capture the craniocervical and trunk flexion angles during VDT work at 30 s, 10, 20 and 30 min. Results: The craniocervical angle was significantly increased at 10 and 20 min compared with the initial angle (p<0.05). The trunk flexion angle was significantly decreased at 30 s, 10, 20 and 30 min (p<0.05). The gluteal pressure of the crossed-leg side significantly increased at 30 s, 10 and 20 min (p<0.05). The gluteal pressure of the uncrossedleg side significantly decreased at 30 s (p<0.05). Conclusion: We found that cross-legged sitting during VDT work may exert disadvantageous postural effects resulting from craniocervical and trunk flexion angles and gluteal pressure. Therefore, this posture could not be recommended during long-term VDT work. (J Occup Health 2011; 53: 350-355)

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Section: Discussionmentioning

confidence: 99%

Changes in Craniocervical and Trunk Flexion Angles and Gluteal Pressure during VDT Work with Continuous Cross‐legged Sitting

Lee

Park

Yoo

2011

Journal of Occupational Health

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“…No matter how small the amplitude of peak pressure under such seating positions, staying static for such long time periods is dangerous. In this study, subjects' own pressure profiles under different seating positions were used as references when the time spent in different pressure positions was calculated, because factors such as cushion type [29] and body build [30] could contribute to determining seating pressure profiles. The pressure-mapping procedure revealed that pressure distribution under different seating positions varied greatly between subjects.…”

Section: Discussionmentioning

confidence: 99%

Usage of tilt-in-space, recline, and elevation seating functions in natural environment of wheelchair users

Ding

Leister²,

Cooper³

et al. 2008

JRRD

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Abstract-This study examined the usage of powered seating functions, including tilt-in-space, backrest recline, and seat elevation, among a group of wheelchair users during their typical daily activities. Twelve individuals who used a power wheelchair with seating functions participated in the study. They drove their own wheelchair and used the seating functions as needed in their community environment for about 2 weeks while the seating function usage was recorded with a portable device. We found that subjects occupied their wheelchair for 11.8 +/-3.4 hours a day (all data shown as mean +/-standard deviation). While occupying their wheelchairs, they accessed tilt-in-space, backrest recline, and seat elevation 19 +/-14 times a day for 64.1% +/-36.8%, 12 +/-8 times for 76.0% +/-29.8%, and 4 +/-4 times for 22.5% +/-34.9%, respectively. Subjects chose to stay in tilted and reclined positions in their wheelchair for 39.3% +/-36.5% of their time each day. They spent little time in a fully upright position. Subjects changed their seating positions every 53.6 +/-47.0 minutes. Time spent in positions of different seating pressures varied among subjects. The information collected could enhance clinical practice of wheelchair provision, resulting in better compliance with clinical instructions and appropriate use of seating functions among wheelchair users.

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“…Impairment of postural control has been associated with a greater anterior displacement of the trunk during static balance and scapular protraction during dynamic situations. 5 Koo et al 6 have demonstrated that patients with paraplegia tend to move their pelvis backward and incline their trunk forward, thus adopting a relaxed posture when sitting on foam seat, whereas wheelchair air seat (Roho cushion) seems to help in maintaining a correct posture. However, Aissaoui et al 7 noted that generic contoured foam promoted greater stability during a reaching task than flat foam and Roho cushion.…”

Section: Introductionmentioning

confidence: 99%

Evaluation of the influence of different types of seats on postural control in individuals with paraplegia

et al. 2010

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Study design: Cross-sectional study. Objectives: To assess the importance of proprioceptive and vision information on different types of wheelchair seats with regard to postural control in paraplegic individuals during static posture. Setting: Centre of Rehabilitation at the University Hospital/FMRP-USP and Rehabilitation Outpatient Clinic at University Hospital/UNICAMP, Brazil. Methods: This study involved 11 individuals with paraplegia. All individuals were submitted to an evaluation of static balance with their eyes open and closed in three different types of seats: wheelchair seat, foam seat and gel seat. Balance evaluation was performed by using the Polhemus system, in which body displacements and anteroposterior and mediolateral speeds were assessed in a static seated position in the different types of seats. Data were analyzed using analysis of variance. The differences were considered at Po0.05. Results: No statistical differences were found between the three types of seats in terms of displacements and anteroposterior and mediolateral speeds, or between seats with individuals keeping their eyes open or closed (P40.05). However, it was observed that body displacements were more prominent toward an anteroposterior than a mediolateral direction. Conclusion: This study suggests that individuals with paraplegia tend to exhibit a more anteroposterior body displacement than a mediolateral one, with no significant differences between the types of seats in both situations of eyes open and closed.

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Posture effect on seating interface biomechanics: Comparison between two seating cushions

Cited by 88 publications

References 4 publications

Changes in Craniocervical and Trunk Flexion Angles and Gluteal Pressure during VDT Work with Continuous Cross‐legged Sitting

Changes in Craniocervical and Trunk Flexion Angles and Gluteal Pressure during VDT Work with Continuous Cross‐legged Sitting

Usage of tilt-in-space, recline, and elevation seating functions in natural environment of wheelchair users

Evaluation of the influence of different types of seats on postural control in individuals with paraplegia

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