The features of muscle activity during chair standing and sitting motion in submerged condition

This study aimed to measure muscle activity and motion kinematics during chair-based exercises under submerged and non-submerged conditions. Twelve healthy men performed chair-based standing and sitting movements. Surface electrodes were attached at the tibialis anterior, gastrocnemius, rectus femoris, biceps femoris, rectus abdominis, and erector spinae. The ankle, knee, and hip joint angles and forward inclination angle of the trunk segment in the sagittal plane were calculated. The mean muscle activities during both movements in the submerged condition for the entire motion were lower than those in the non-submerged condition except in the tibialis anterior and biceps femoris during the sitting movement (in the standing exercise, rectus femoris: 14.1% and 5.2%; and erector spinae: 18.3% and 13.6% in non-submerged and submerged conditions, respectively; and in the sitting exercise, rectus femoris: 12.1% and 4.5% and erector spinae: 12.9% and 9.9% in the non-submerged and submerged con...

本研究旨在测定水下与非水下工况下，椅上训练动作过程中的肌肉活动与运动学参数。招募12名健康男性完成基于座椅的站起与坐下动作。将表面电极（surface electrode）贴附于胫骨前肌（tibialis anterior）、腓肠肌（gastrocnemius）、股直肌（rectus femoris）、股二头肌（biceps femoris）、腹直肌（rectus abdominis）及竖脊肌（erector spinae）。计算矢状面（sagittal plane）内踝、膝、髋关节的角度，以及躯干节段的前倾角。除坐下动作阶段的胫骨前肌与股二头肌外，水下工况下两种动作全程的平均肌肉活动均低于非水下工况；其中站起动作：非水下与水下环境下股直肌分别为14.1%与5.2%，竖脊肌分别为18.3%与13.6%；坐下动作：非水下与水下环境下股直肌分别为12.1%与4.5%，竖脊肌分别为12.9%与9.9%，原文后续内容未完整给出。