Kingma Idsart, van Dieën Jaap H
Research Institute Move, Faculty of Human Movement Sciences, VU University, Van der Boechorststraat 9, 1081 BT Amsterdam, The Netherlands.
Appl Ergon. 2009 Mar;40(2):199-205. doi: 10.1016/j.apergo.2008.04.004. Epub 2008 May 27.
Seated computer work results in prolonged static loading, which has been associated with the development of musculoskeletal disorders. A popular alternative to sitting on an office chair while performing computer work is to sit on an exercise ball. Sitting on an exercise ball might affect static and dynamic aspects of working posture. We monitored posture, muscle activation and spinal shrinkage in 10 females performing a 1-h typing task, while sitting on an office chair with armrests and while sitting on an exercise ball. Sitting on an exercise ball resulted in 33% more trunk motion and in 66% more variation in lumbar EMG. Both of these findings can be considered to be an advantage for the exercise ball. However, the fifth percentile and average lumbar EMG were also higher when sitting on an exercise ball, with 38% and 78%, respectively. In addition, more spinal shrinkage occurred when sitting on an exercise ball than when sitting on an office chair. Arm flexion was reduced, but trapezius activation was unaffected when sitting on an exercise ball. It is concluded that the advantages with respect to physical loading of sitting on an exercise ball may not outweigh the disadvantages.
坐着进行电脑工作会导致长时间的静态负荷，这与肌肉骨骼疾病的发生有关。在进行电脑工作时，一种流行的替代坐在办公椅上的方式是坐在健身球上。坐在健身球上可能会影响工作姿势的静态和动态方面。我们监测了10名女性在进行1小时打字任务时的姿势、肌肉激活和脊柱收缩情况，她们分别坐在有扶手的办公椅上和坐在健身球上。坐在健身球上时，躯干运动增加了33%，腰部肌电图的变化增加了66%。这两个发现都可以被认为是健身球的优势。然而，坐在健身球上时，第5百分位数和平均腰部肌电图也更高，分别高出38%和78%。此外，坐在健身球上比坐在办公椅上时脊柱收缩更多。坐在健身球上时手臂弯曲减少，但斜方肌激活不受影响。结论是，坐在健身球上在身体负荷方面的优势可能并不大于劣势。
