Dept of Kinesiology, University of Toledo, Toledo, OH.
J Sport Rehabil. 2013 Nov;22(4):239-47. doi: 10.1123/jsr.22.4.239. Epub 2013 Apr 18.
Components of gluteal neuromuscular function, such as strength and corticospinal excitability, could potentially influence alterations in lower extremity biomechanics during jump landing.
To determine the relationship between gluteal muscle strength, gluteal corticospinal excitability, and jump-landing biomechanics in healthy women.
University laboratory.
Descriptive laboratory study.
37 healthy women (21.08 ± 2.15 y, 164.8 ± 5.9 cm, 65.4 ± 12.0 kg).
Bilateral gluteal strength was assessed through maximal voluntary isometric contractions (MVIC) using an isokinetic dynamometer. Strength was tested in the open chain in prone and side-lying positions for the gluteus maximus and gluteus medius muscles, respectively. Transcranial magnetic stimulation was used to elicit measures of corticospinal excitability. Participants then performed 3 trials of jump landing from a 30-cm box to a distance of 50% of their height, with an immediate rebound to a maximal vertical jump. Each jump-landing trial was video recorded (2-D) and later scored for errors.
MVICs normalized to body mass were used to assess strength in the gluteal muscles of the dominant and nondominant limbs. Corticospinal excitability was assessed by means of active motor threshold (AMT) and motor-evoked potentials (MEP) elicited at 120% of AMT. The Landing Error Scoring System (LESS) was used to evaluate jump-landing biomechanics.
A moderate, positive correlation was found between dominant gluteus maximus MEP and LESS scores (r = .562, P = .029). No other significant correlations were observed for MVIC, AMT, or MEP for the gluteus maximus and gluteus medius, regardless of limb.
The findings suggest a moderate relationship between dominant gluteus maximus corticospinal excitability and a clinical measure of jump-landing biomechanics. Further research is required to substantiate the findings and expand our understanding of the central nervous system's role in athletic movement.
臀肌的神经肌肉功能的组成部分，如力量和皮质脊髓兴奋性，可能会影响跳跃落地时下肢生物力学的改变。
确定健康女性臀肌力量、臀肌皮质脊髓兴奋性与跳跃落地生物力学之间的关系。
大学实验室。
描述性实验室研究。
37 名健康女性（21.08 ± 2.15 岁，164.8 ± 5.9cm，65.4 ± 12.0kg）。
使用等速测力计评估双侧臀肌最大自主等长收缩（MVIC）的力量。臀大肌和臀中肌的力量分别在俯卧和侧卧位的开链中进行测试。使用经颅磁刺激来引出皮质脊髓兴奋性的测量值。然后，参与者从 30cm 的盒子上进行 3 次跳跃落地试验，距离为其身高的 50%，然后立即反弹至最大垂直跳跃。每个跳跃落地试验都进行了（2-D）视频记录，并在以后根据错误进行评分。
使用优势和非优势肢体的臀肌体质量标准化的 MVIC 来评估力量。通过 120%主动运动阈值（AMT）的主动运动阈值（AMT）和运动诱发电位（MEP）评估皮质脊髓兴奋性。使用着陆错误评分系统（LESS）评估跳跃落地生物力学。
发现优势臀大肌 MEP 与 LESS 评分呈中度正相关（r =.562，P =.029）。对于臀大肌和臀中肌的 MVIC、AMT 或 MEP，无论肢体如何，均未观察到其他显著相关性。
这些发现表明，优势臀大肌皮质脊髓兴奋性与跳跃落地生物力学的临床测量之间存在中度关系。需要进一步的研究来证实这些发现，并扩大我们对中枢神经系统在运动中的作用的理解。
