The sit-to-stand transfer can be separated into a postural phase (trunk flexion) and a focal phase (whole-body extension). The aim of this study was to analyze the as yet little known whole-body muscular activity characterizing each phase of this task and its variations with backrest inclination and execution speed. Fifteen muscles of the trunk and lower limbs of 10 participants were investigated using surface EMG. Results showed that backrest-induced modifications were mostly confined to the postural phase: reclining the backrest increased its duration and the activity level of the sternocleidomastoideus, the rectus and obliquus externus abdominis, and the semitendinosus. Speed-induced variations were also predominant during the postural phase, which was shortened with an increased activity of most muscles at maximal speed.

从坐到站的转移可以分为姿势阶段（躯干屈曲）和聚焦阶段（全身伸展）。这项研究的目的是分析尚未完成的表征该任务各个阶段的全身肌肉活动及其随靠背倾斜度和执行速度的变化。使用表面肌电图检查了10名参与者的躯干和下肢的15条肌肉。结果表明，靠背引起的改变主要局限于姿势阶段：靠背增加了其持续时间，增加了胸锁骨，腹直肌和腹外斜肌以及半腱肌的活动水平。在姿势阶段，速度引起的变化也是主要的，随着最大速度下大多数肌肉活动的增加，这种变化被缩短了。