Kolářová Barbora, Krobot Alois, Polehlová Kamila, Hluštík Petr, Richards Jim D
Department of Physiotherapy, Faculty of Health Sciences, Palacky University Olomouc, Czech Republic; Department of Rehabilitation, University Hospital Olomouc, Czech Republic
Department of Physiotherapy, Faculty of Health Sciences, Palacky University Olomouc, Czech Republic; Department of Rehabilitation, University Hospital Olomouc, Czech Republic.
Percept Mot Skills. 2016 Apr;122(2):411-31. doi: 10.1177/0031512516640377.
The objective of this study was to evaluate the effect of gait imagery tasks on lower limb muscle activity with respect to body posture. The sitting and standing position and lower limb muscle activity were evaluated in 27 healthy female students (24.4 ± 1.3 years, 167.2 ± 5.2 cm, 60.10 ± 6.4 kg). Surface electromyography was assessed during rest and in three different experimental conditions using mental imagery. These included a rhythmic gait, rhythmic gait simultaneously with observation of a model, and rhythmic gait after performing rhythmic gait. The normalized root mean square EMG values with respect to corresponding rest position were compared using non-parametric statistics. Standing gait imagery tasks had facilitatory effect on proximal lower limb muscle activity. However, electromyography activity of distal leg muscles decreased for all gait imagery tasks in the sitting position, when the proprioceptive feedback was less appropriate. For subsequent gait motor imagery tasks, the muscle activity decreased, probably as result of habituation. In conclusion, the effect of motor imagery on muscle activity appears to depend on relative strength of facilitatory and inhibitory inputs.
本研究的目的是评估步态想象任务对与身体姿势相关的下肢肌肉活动的影响。对27名健康女学生（24.4±1.3岁，167.2±5.2厘米，60.10±6.4千克）的坐姿、站姿及下肢肌肉活动进行了评估。在休息状态及三种不同的使用心理意象的实验条件下评估表面肌电图。这三种条件包括有节奏的步态、与观察模特同步的有节奏的步态以及在执行有节奏的步态后进行的有节奏的步态。使用非参数统计比较相对于相应休息位置的标准化均方根肌电图值。站立步态想象任务对下肢近端肌肉活动有促进作用。然而，当本体感觉反馈不太合适时，在坐姿下所有步态想象任务的小腿远端肌肉的肌电图活动均降低。对于后续的步态运动想象任务，肌肉活动降低，可能是习惯化的结果。总之，运动想象对肌肉活动的影响似乎取决于促进性和抑制性输入的相对强度。
