Sakulsriprasert Prasert, Eak-udchariya Penpailin, Jalayondeja Wattana
J Med Assoc Thai. 2015 Jun;98 Suppl 5:S125-30.
This study aimed to investigate the electromyography (EMG) activity amongfive abdominal and back muscles at six starting positions in untrained individuals.
Twenty-five healthy individuals aged 20.9 +/- 3.9 years, who were inexperienced with lumbar stabilization exercise, were recruited. They were asked to perform maximum voluntary isometric contraction (MVIC), and then six starting positions in random order EMG data ofeach starting position were normalized as a percentage of MVIC. Friedman two-way analysis of variance (ANOVA) and Wilcoxon signed-ranks tests were used for data analysis.
Significant differences in EMG activity of five abdominal and back muscles were found in all six starting positions (p<0.001). The highest EMG activity ofthe transversus abdominis/internal abdominal oblique (TrA/IO) was found in crook lying, with right leg lifted (CLR), and of multifidus (MF) in four-point kneeling with straight right leg lifted horizontally (4p-SRL).
The results suggested that CLR and sitting on a gym ball (SG) were able tofacilitate TrA/IO activity with minimal activity from the rectus abdominis (RA), while CL, 4p-SRL, andSG were able tofacilitate MF activity with minimal activity from erector spinae (ES).
本研究旨在调查未经训练的个体在六个起始姿势下腹部和背部五块肌肉的肌电图（EMG）活动情况。
招募了25名年龄在20.9±3.9岁之间、未进行过腰椎稳定训练的健康个体。要求他们进行最大自主等长收缩（MVIC），然后以随机顺序进行六个起始姿势的动作。每个起始姿势的EMG数据均以MVIC的百分比进行标准化。采用Friedman双向方差分析（ANOVA）和Wilcoxon符号秩检验进行数据分析。
在所有六个起始姿势下，腹部和背部五块肌肉的EMG活动均存在显著差异（p<0.001）。腹横肌/腹内斜肌（TrA/IO）的EMG活动在右侧腿抬起的屈膝卧位（CLR）时最高，多裂肌（MF）的EMG活动在右腿水平伸直抬起的四点跪位（4p-SRL）时最高。
结果表明，CLR和坐在健身球上（SG）能够促进TrA/IO活动，同时腹直肌（RA）的活动最小，而CL、4p-SRL和SG能够促进MF活动，同时竖脊肌（ES）活动最小。
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