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Abstract
The effect of backrest inclination, lumbar support and thoracic support on the intraabdominal pressure (IAP) while lifting a Wight of 12 kg has been investigated. It was found that the lowest values of IAP were obtained when: (i) the lumbar support was positioned +4cm forward, the thoracic support inclined to +10° and the backrest inclination was 110°; (ii) same as (i) except that the backrest was inclined to 100°; (iii) the lumbar support was positioned +1 cm forward, the thoracic support inclined to +10° and the backrest inclined to 110°; (iv) same as (iii) except that the backrest was inclined to 100°; (v) the lumbar support and thoracic support were both increased; and (vi) the backrest inclination, the lumbar support and the thoracic were increased together or separately.