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  • 期刊

Effects of Active Hip and Ankle Positioning on the Vastus Medialis Oblique: The Vastus Lateralis Electromyographic Ratio during Straight-Leg-Raising in Healthy Adults

無阻力直膝擡腿運動之髖關節與踝關節擺位的變化對股內斜肌與股外肌之肌電活動比例的影響

摘要


背景與目的:根據已被提出的選擇性作用理論,經由運動可選擇性強化股內斜肌;然而,此一理論仍有爭議性。本研究的目的即在探討做直膝抬腿運動時,髖關節與膝關節擺位的不同,能否選擇性強化股內斜肌。方法:十八位健康的受測者於平躺的姿勢下,執行無阻力直膝抬腿舉高30度的運動,同時搭配六種不同的髖關節(正中、外旋)與踝關節(背屈、自然、蹠屈)的擺位組合,並以表面電極記錄股內斜肌與股外肌的肌電活動。計算出非標準化與標準化之股內斜肌:股外肌的肌電活動比例,以執行統計分析。另外,亦將個別分析股內斜肌與股外肌之非標準化與標準化的肌電活動,以瞭解個別肌肉在不同擺位組合間之肌電活動變化。結果:不論是非標準化或標準化的肌電活動分析,皆呈現相同結果。踝關節蹠屈擺位之股內斜肌與股外肌的肌電活動比例值,比自然擺位之比例值大,有顯著差異;蹠屈擺位可能減少股外肌的肌電活動,但不會改變股內斜肌的肌電活動。踝關節之背屈擺位與自然擺位或跋屈擺位問,皆無顯著的差異。髖關節之正中與外旋兩擺位間,亦無顯著差異;髖關節與踝關節兩者之擺位,對股內斜肌與股外肌的肌電活動比例無交互作用的影響。結論:以踝關節蹠屈擺位執行無阻力直膝抬腿運動可能減少股外肌的肌電活動,但無選擇性強化股內斜肌的效果,導致股內斜肌:股外肌的肌電活動比例之增加。

並列摘要


Background and Purpose: The selective action theory has been proposed to selectively strengthen the vastus medialis oblique (VMO) muscle via exercise. However, disagreement exists as to whether the VMO muscle can be selectively activated. The purpose of this study was to determine whether different hip and ankle positions while performing a straight leg raising (SLR) exercise could selectively activate the VMO muscle, leading to a greater activity ratio of the VMO and the vastus lateralis (VL). Methods: Eighteen healthy subjects participated in this study. Electromyographic (EMG) activity of the VMO and the VL muscles were recorded using surface electrodes while performing a 30- degree, non-resisted SLR exercise in supine with six combinations of different hip (neutral position and external rotation) and ankle (relaxed resting position, dorsiflexion, and plantar flexion) positions. Non-normalized and normalized averaged integrated EMG (IEMG) ratios of the VMO to VL muscles were calculated for statistical analysis (two-way repeated-measures ANOVA). The averaged IEMG data of the VMO and VL muscles (non-normalized or normalized) was analyzed to compare the changes of each muscle activity across exercises. Results: Both non-normalized and normalized IEMG data showed the same results. The VMO:VL IEMG ratio observed in the position of ankle plantar flexion was significantly greater than that in the relaxed resting position. With the addition of ankle plantar flexion, the VL muscle activity might be reduced while the VMO muscle activity remained unchanged as compared to that in the relaxed resting position. No significant differences were found in the VMO:VL IEMG ratio between ankle dorsiflexion and the other two ankle positions or between the two hip positions. There was no interaction effect on the VMO:VL IEMG ratio between the hip and ankle positions. Conclusion: The results indicated that the use of ankle plantar flexion during a non-resisted SLR exercise in supine might reduce the VL muscle activity instead of selectively activating the VMO muscle, resulting in a greater VMO: VL activity ratio.

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