Sternlicht Eric, Rugg Stuart, Fujii Larissa L, Tomomitsu Keri F, Seki Matt M
Department of Kinesiology, Occidental College, Los Angeles, California 90041, USA.
J Strength Cond Res. 2007 May;21(2):506-9. doi: 10.1519/R-20436.1.
The purpose of this study was to compare abdominal muscle activity while performing a crunch on a stability ball with a traditional crunch. Forty-one healthy adults (23 men and 18 women) participated in the study. The subjects performed the crunch with the ball in 2 positions, 1 with the ball at the level of the inferior angles of the scapula (SB-high) and 1 with the ball at the level of the lower lumbar region of the back (SB-low). Surface electromyography was recorded from the upper and lower portions of the rectus abdominis and the external oblique during each repetition. Electromyography values were analyzed using repeated measures analyses of variance and pair-wise comparisons. Muscle activity for the upper and lower portions of the rectus abdominis and external oblique for a traditional crunch was significantly lower than for the crunch performed in the SB-low position but significantly greater than the SB-high position. Our data also showed that, on average, the abdominal muscle activity doubled when the stability ball was moved from the upper to the lower back position. These results support previous findings that a stability ball is not only effective for training the abdominal musculature, but, with the correct placement, it can also significantly increase muscle activity when compared with a traditional crunch. In addition, our results suggest that ball placement is critical for matching the appropriate overload to the condition level of the user.
本研究的目的是比较在稳定球上进行卷腹动作与传统卷腹动作时腹部肌肉的活动情况。41名健康成年人（23名男性和18名女性）参与了该研究。受试者在稳定球上进行卷腹动作时处于2个位置，1个位置是球位于肩胛下角水平（高球位），另1个位置是球位于下背部腰椎区域水平（低球位）。在每次重复动作时，记录腹直肌上下部分和腹外斜肌的表面肌电图。使用重复测量方差分析和两两比较来分析肌电图值。传统卷腹动作时腹直肌上下部分和腹外斜肌的肌肉活动明显低于低球位卷腹动作，但明显高于高球位卷腹动作。我们的数据还表明，平均而言，当稳定球从背部上方位置移动到下方位置时，腹部肌肉活动增加了一倍。这些结果支持了先前的研究结果，即稳定球不仅对训练腹部肌肉组织有效，而且与传统卷腹动作相比，在正确放置的情况下，它还能显著增加肌肉活动。此外，我们的结果表明，球的放置对于根据使用者的身体状况匹配适当的负荷至关重要。
