Technical note: spine loading in automotive seating.

For car manufacturers, seat comfort is becoming more important in distinguishing themselves from their competitors. Therefore, many studies on participative seat comfort are carried out. In this paper, an objective assessment approach is reported which evaluates the concept of "optimal load distribution", based on the identification of a close relationship between the pressure on the seat and the discomfort felt by the person sitting. An in vivo measurement of the pressure in the spinal disc, which is an indicator of the load in the spine, was performed. For this research, a pressure sensor was implanted with a canula in the middle of the disc intervertebralis of a participant. The local pressure on the disc was established for the participant in an automobile seat set in various seat positions. The results indicate that in the seat position with the pressure distribution corresponding to the most comfortable posture the pressure in the intervertebral disc is lowest. The pressure in this position is 0.5 bar, while in the upright seated position the pressure is 1.6 bar.

[1]  Heiner Bubb,et al.  Objectifying the Comfort of Car Seats , 2006 .

[2]  Heiner Bubb,et al.  Emocard – An Approach to Bring More Emotion in the Comfort Concept , 2008 .

[3]  Manohar M. Panjabi,et al.  Clinical Biomechanics of the Spine , 1978 .

[4]  J. Hartung.  Objektivierung des statischen Sitzkomforts auf Fahrzeugsitzen durch die Kontaktkräfte zwischen Mensch und Sitz , 2006 .

[5]  Peter Vink,et al.  The effect of a participative product design process on user performance , 2007 .

[6]  Kurt Tittel,et al.  Beschreibende und funktionelle Anatomie des Menschen , 1981 .

[7]  L. Claes,et al.  New in vivo measurements of pressures in the intervertebral disc in daily life. , 1999, Spine.

[8]  Raphael Zenk.  Objektivierung des Sitzkomforts und seine automatische Anpassung , 2008 .

[9]  A. Nachemson.  The Load on Lumbar Disks in Different Positions of the Body , 1966, Clinical orthopaedics and related research.

[10]  C. Mergl.  Entwicklung eines Verfahrens zur Optimierung des Sitzkomforts auf Automobilsitzen , 2006 .

[11]  Heiner Bubb,et al.  Objectifying the Comfort of Car Seats: SAE Technical Paper 2006-01-1299 , 2006 .

[12]  John Crawford Adams,et al.  Rumpf und Wirbelsäule , 1982 .

[13]  Colin G. Drury,et al.  Identifying Factors of Comfort and Discomfort in Sitting , 1996, Hum. Factors.

[14]  Seiji Noriyasu,et al.  The function of the psoas major muscle: passive kinetics and morphological studies using donated cadavers , 2002, Journal of orthopaedic science : official journal of the Japanese Orthopaedic Association.

[15]  Martin Helander.  Forget about ergonomics in chair design? Focus on aesthetics and comfort! , 2003, Ergonomics.

[16]  M. de Looze,et al.  Please Scroll down for Article Ergonomics Sitting Comfort and Discomfort and the Relationships with Objective Measures Sitting Comfort and Discomfort and the Relationships with Objective Measures , 2022 .

[17]  N Bogduk,et al.  Anatomy and biomechanics of psoas major. , 1992, Clinical biomechanics.