Hamaoui Alain, Hassaïne Myriam, Zanone Pier-Giorgio
Laboratory of Posture and Movement Physiology, University Champollion, Albi, France; PRISSMH, University of Toulouse, University Paul Sabatier, Toulouse, France.
PRISSMH, University of Toulouse, University Paul Sabatier, Toulouse, France.
PLoS One. 2015 Jan 14;10(1):e0116353. doi: 10.1371/journal.pone.0116353. eCollection 2015.
The objective of this study was to explore the effect of a forward sloping seat on posture and muscular activity of the trunk and lower limbs. To this aim, twelve asymptomatic participants were tested in six conditions varying seat slope (0°, 15° forward) and height (high, medium, low). Angular position of head, trunk and pelvis was assessed with an inertial orientation system, and muscular activity of 11 superficial postural muscles located in the trunk and lower limbs was estimated using normalized EMG. Results showed that a forward sloping seat, compared to a flat seat, induced a greater activity of the soleus (p<0.01), vastus lateralis (p<0.05) and vastus medialis (p<0.05), as well a lower hip flexion (p<0.01). In contrast, no significant variation of head, trunk and pelvis angular position was observed according to seat slope. It was concluded that forward sloping seats increase the load sustained by the lower limbs, without a systematic improvement of body posture.
本研究的目的是探讨前倾座椅对躯干和下肢姿势及肌肉活动的影响。为此，对12名无症状参与者在六种条件下进行了测试，这些条件包括座椅倾斜度（0°、向前15°）和高度（高、中、低）的变化。使用惯性定向系统评估头部、躯干和骨盆的角位置，并使用标准化肌电图估计位于躯干和下肢的11块表层姿势肌肉的肌肉活动。结果表明，与平座椅相比，前倾座椅会引起比目鱼肌更大的活动（p<0.01）、股外侧肌（p<0.05）和股内侧肌（p<0.05），以及更低的髋关节屈曲（p<0.01）。相比之下，未观察到根据座椅倾斜度头部、躯干和骨盆角位置有显著变化。得出的结论是，前倾座椅会增加下肢承受的负荷，而不会系统地改善身体姿势。
