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Background: In vehicles there is often limited space for seats. This might mean that reclining the back rest reduces the legroom. The second row in a cargo van has this problem and in this limited space an upright seat and a reclined seat with less legroom was developed and tested.
Objective: The research question of this study is: METHODS:Twenty participants are asked to sit 45 minutes in the upright seat with 8 cm more legroom and 45 minutes in the reclined seat. Ten participants started in the upright seat and ten in the reclined. Participants had to complete a comfort and discomfort questionnaire every 15 minutes and a qualitative interview was conducted after experiencing both seats.
Results: For comfort no statistically significant differences were found between both seats. For discomfort statistically significant differences were found where discomfort was lower in the reclined seat. Half of the participants preferred the upright and half the reclined seat. The interviews showed that the reclined position was more related to relaxation.
Conclusions: This study indicates that a more reclined back rest results in less discomfort, but that does not lead to a clear preference of participants. The reclined position is associated with relaxing, and this study indicates that for the relaxing state the more reclined seat is preferred. For more active situations the upright posture seems better.
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http://dx.doi.org/10.3233/WOR-230643 | DOI Listing |
Traffic Inj Prev
September 2025
Department of Biomedical Engineering, Medical College of Wisconsin, Milwaukee, Wisconsin.
Objective: Assessment of submarining occurrence in PMHS (Post-Mortem Human Subject) testing can be challenging, particularly for obese PMHS. This study investigates varied kinetic and kinematic response parameters as potential indicators of submarining. Data from 36 whole-body PMHS frontal sled tests conducted under varying boundary conditions were analyzed, incorporating three spring-controlled seat configurations, two extreme anthropometric profiles, two crash pulses, and two seatback angles.
View Article and Find Full Text PDFErgonomics
September 2025
Groupe Stellantis, Vélizy-Villacoublay, France.
This study investigated the effects of non-driving related tasks (NDRTs) and seat back angles (SBAs) on preferred seat parameters and seating discomfort in highly automated vehicles. Using a static, reconfigurable experimental seat, 32 participants self-selected preferred seat parameters for four tasks with varying vision demands (relaxing, looking forward, working on a laptop, watching a tablet video) at three SBAs: 20°, 40° and 60°. Results show that SBA influenced all self-selected seat parameters, while task only affected those related to the headrest.
View Article and Find Full Text PDFWork
August 2025
Marwadi University Research Center, Faculty of Management Studies, Marwadi University, Rajkot, India.
BackgroundWhole-body vibration (WBV) poses significant health risks, including musculoskeletal disorders and discomfort, especially for individuals exposed to prolonged vibrations, such as drivers and industrial operators. This study evaluates the effects of vibration transmissibility on varying human masses, seat materials, backrest angles, and acceleration levels, aiming to inform the design of ergonomic seating systems that enhance safety and comfort in vibration-prone environments.ObjectiveTo assess the impact of vibrations on human subjects with varying masses representative of the 50 and 95 percentile Indian male population in a seated posture.
View Article and Find Full Text PDFAnn Biomed Eng
August 2025
Medical College of Wisconsin, 5000 West National Ave, Research 151, Zablocki VA Medical Center, Milwaukee, WI, 53295, USA.
Purpose: This study estimates the tolerance of the female pelvis iliac wing under lap belt loading in frontal impacts. With future autonomous vehicles relying on seatbelts as the primary restraint, understanding pelvic injury biomechanics is crucial. The goal was to investigate pelvis fracture patterns resulting from seat belt loading among female specimens in MCW series and develop injury risk curves (IRCs) for iliac bone fracture.
View Article and Find Full Text PDFProsthet Orthot Int
August 2025
Department of Physical Therapy, Faculty of Rehabilitation, Kawasaki University of Medical Welfare, Kurashiki, Japan.
Background: Tilt-in-space and reclining functions are commonly used to improve comfort in ergonomic seating. However, fluctuations in shear (parallel) forces on the buttocks during postural changes may cause discomfort, yet this relationship is not well understood.
Objectives: To examine how combined use of tilt-in-space and reclining functions affects fluctuations in parallel forces on the buttocks, and how these fluctuations relate to subjective discomfort.