Select Physical Therapy, Clarksville, TN, USA.
J Sport Rehabil. 2011 Nov;20(4):428-41. doi: 10.1123/jsr.20.4.428.
The Star Excursion Balance Test (SEBT) is often used to train and assess dynamic balance and neuromuscular control. Few studies have examined hip- and thigh-muscle activation during the SEBT.
To quantify hip- and thigh-muscle activity during the SEBT.
Repeated measures.
Laboratory.
22 healthy individuals, 11 men and 11 women.
EMG measurements were taken as participants completed 3 trials of the anterior (A), medial (M), and posteromedial (PM) reach directions of the SEBT.
Mean EMG data (% maximal voluntary isometric contraction) from the gluteus medius (Gmed), gluteus maximus (Gmax), and vastus medialis (VM) were measured during the eccentric phase of each SEBT reach direction. Test-retest reliability of EMG data across the 3 trials in each direction was calculated. EMG data from each muscle were compared across the 3 reach directions.
Test-retest reliability ranged from ICC3,1 values of .91 to .99. A 2-way repeated-measure ANOVA revealed a significant interaction between muscle activation and reach direction. One-way ANOVAs showed no difference in GMed activity between the A and M directions. GMed activity in the A and M directions was greater than in the PM direction. There was no difference in GMax and VM activity across the 3 directions.
GMed was recruited most effectively when reaching was performed in the A and M directions. The A, M, and PM directions elicited similar patterns of muscle recruitment for the GMax and VM. During all 3 SEBT directions, VM activation exceeded the 40-60% threshold suggested for strengthening effects. GMed activity also exceeded the threshold in the M direction. GMax activation, however, was below the 40% threshold for all 3 reach directions, suggesting that performing dynamic lower extremity reaching in the A, M, and PM directions may not elicit strengthening effects for the GMax.
星状伸展平衡测试（SEBT）常用于训练和评估动态平衡和神经肌肉控制。很少有研究检查过 SEBT 过程中的髋关节和大腿肌肉激活情况。
定量分析 SEBT 过程中的髋关节和大腿肌肉活动。
重复测量。
实验室。
22 名健康个体，11 名男性和 11 名女性。
参与者完成 SEBT 的前向（A）、内侧（M）和后内侧（PM）伸展方向的 3 次试验时，进行肌电图测量。
在每个 SEBT 伸展方向的离心阶段，测量臀中肌（Gmed）、臀大肌（Gmax）和股内侧肌（VM）的平均肌电图数据（%最大等长收缩）。计算每个方向 3 次试验的肌电图数据的测试-重测信度。比较 3 个伸展方向的每个肌肉的肌电图数据。
测试-重测信度的 ICC3,1 值范围为.91 至.99。2 因素重复测量方差分析显示肌肉激活和伸展方向之间存在显著交互作用。单因素方差分析显示 GMed 在 A 和 M 方向的活动无差异。A 和 M 方向的 GMed 活动大于 PM 方向。GMax 和 VM 在 3 个方向的活动无差异。
在 A 和 M 方向进行伸展时，GMed 的募集效果最佳。对于 GMax 和 VM，A、M 和 PM 方向引发了相似的肌肉募集模式。在所有 3 个 SEBT 方向中，VM 激活超过了 40-60%的强化效果阈值。在 M 方向，GMed 活动也超过了阈值。然而，对于所有 3 个伸展方向，GMax 的激活均低于 40%的阈值，这表明在 A、M 和 PM 方向进行动态下肢伸展可能不会对 GMax 产生强化效果。
