Keio University Shonan Fujisawa Campus, 5322 Endo, Fijisawa-city, Kanagawa 252-8520, Japan.
J Electromyogr Kinesiol. 2009 Dec;19(6):1064-70. doi: 10.1016/j.jelekin.2008.11.001. Epub 2008 Dec 18.
The present study used synchronized motion analysis to investigate the activity of hip and trunk muscles during deep-water running (DWR) relative to land walking (LW) and water walking (WW). Nine healthy men performed each exercise at self-determined slow, moderate, and fast paces, and surface electromyography was used to investigate activity of the adductor longus, gluteus maxima, gluteus medius, rectus abdominis, oblique externus abdominis, and erector spinae. The following kinematic parameters were calculated: the duration of one cycle, range of motion (ROM) of the hip joint, and absolute angles of the pelvis and trunk with respect to the vertical axis in the sagittal plane. The percentages of maximal voluntary contraction (%MVC) of each muscle were higher during DWR than during LW and WW. The %MVC of the erector spinae during WW increased concomitant with the pace increment. The hip joint ROMs were larger in DWR than in LW and WW. Forward inclinations of the trunk were apparent for DWR and fast-paced WW. The pelvis was inclined forward in DWR and WW. In conclusion, the higher-level activities during DWR are affected by greater hip joint motion and body inclinations with an unstable floating situation.
本研究采用同步运动分析，研究了深水区跑步（DWR）与陆地行走（LW）和水中行走（WW）相比时髋关节和躯干肌肉的活动情况。9 名健康男性以自我决定的慢、中、快三种速度进行每种运动，表面肌电图用于研究内收肌长、臀大肌、臀中肌、腹直肌、腹外斜肌和竖脊肌的活动情况。计算了以下运动学参数：一个周期的持续时间、髋关节的运动范围（ROM）以及骨盆和躯干相对于矢状面垂直轴的绝对角度。与 LW 和 WW 相比，DWR 时各肌肉的最大随意收缩百分比（%MVC）更高。WW 时的竖脊肌%MVC 随步速增加而增加。DWR 时髋关节 ROM 大于 LW 和 WW。DWR 和快速 WW 时躯干前倾。DWR 和 WW 时骨盆前倾。总之，DWR 时更高水平的活动受到更大的髋关节运动和身体倾斜以及不稳定的漂浮状态的影响。
