Makhsous Mohsen, Rowles Diane M, Rymer William Z, Bankard James, Nam Ellis K, Chen David, Lin Fang
Department of Physical Therapy and Human Movement Sciences, Northwestern University, Chicago, IL 60611, USA.
Arch Phys Med Rehabil. 2007 Jul;88(7):862-70. doi: 10.1016/j.apmr.2007.03.017.
To investigate the relieving effect on interface pressure of an alternate sitting protocol involving a sitting posture that reduces ischial support.
Repeated measures in 2 protocols on 3 groups of subjects.
Laboratory.
Twenty able-bodied persons, 20 persons with paraplegia, and 20 persons with tetraplegia.
Two 1-hour protocols were used: alternate and normal plus pushup. In the alternate protocol, sitting posture was alternated every 10 minutes between normal (sitting upright with ischial support) and with partially removed ischial support (WO-BPS) postures; in the normal plus pushup protocol, sitting was in normal posture with pushups (lifting the subject off the seat) performed every 20 minutes.
Interface pressure on seat and backrest.
In WO-BPS posture, the concentrated interface pressure observed around the ischia in normal posture was significantly repositioned to the thighs. By cyclically repositioning the interface pressure, the alternate protocol was superior to the normal plus pushup protocol in terms of a significantly lower average interface pressure over the buttocks.
A sitting protocol periodically reducing the ischial support helps lower the sitting load on the buttocks, especially the area close to ischial tuberosities.
研究一种交替坐姿方案对界面压力的缓解作用，该方案涉及一种减少坐骨支撑的坐姿。
对三组受试者在两种方案中进行重复测量。
实验室。
20名身体健全者、20名截瘫患者和20名四肢瘫患者。
采用两种1小时的方案：交替方案和正常加俯卧撑方案。在交替方案中，坐姿每10分钟在正常坐姿（坐骨支撑时坐直）和部分去除坐骨支撑（WO-BPS）的姿势之间交替；在正常加俯卧撑方案中，以正常姿势就坐，每20分钟进行一次俯卧撑（将受试者抬离座位）。
座椅和靠背上的界面压力。
在WO-BPS姿势下，正常姿势时在坐骨周围观察到的集中界面压力显著重新分布到大腿。通过周期性地重新分布界面压力，交替方案在臀部平均界面压力显著更低方面优于正常加俯卧撑方案。
一种定期减少坐骨支撑的坐姿方案有助于降低臀部的坐姿负荷，尤其是靠近坐骨结节的区域。
