Trunk Dynamics Are Impaired in Ballet Dancers with Back Pain but Improve with Imagery
Trunk Dynamics Are Impaired in Ballet Dancers with Back Pain but Improve with Imagery
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DOI：
10.1249/mss.0000000000000594
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发表时间：
2015-08-01
期刊：
影响因子：
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通讯作者：
Hodges, Paul W.
中科院分区：
文献类型：
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作者：
Gildea, Jan E.;Van den Hoorn, Wolbert;Hodges, Paul W.
目的躯干控制在芭蕾舞中至关重要，对于有腰痛 (LBP) 病史的舞者来说，躯干控制可能会因运动控制的相关变化而受到影响。本研究旨在比较有腰痛病史和无腰痛病史的专业芭蕾舞演员的躯干机械特性。作为次要目标，我们评估了要求舞者使用运动想象以“流畅”的方式做出反应是否可以改变躯干的机械特性，以及这对于两组来说是否都是可能的。方法对于有（n = 22）和没有（n = 8）有腰痛病史的专业芭蕾舞演员，通过线性二阶系统根据对扰动的躯干运动来估计躯干的刚度和阻尼机械特性。二阶模型充分描述了躯干响应扰动的运动。在有或没有运动想象的情况下进行试验，以对扰动做出流畅的反应。结果有 LBP 病史的舞者在标准条件下比没有 LBP 的舞者具有更低的阻尼 (P = 0.002)，但在“流体”条件下具有更大的阻尼 (P < 0.001)，其值与没有 LBP 的舞者相似 (P = 0.226)。没有 LBP 的舞者的阻尼在不同条件下是相似的 (P > 0.99)。有腰痛病史的舞者和没有腰痛病史的舞者之间的刚度没有差异（P = 0.252），但在流体条件下比标准条件下的刚度要小（P < 0.001）。结论虽然有腰痛病史的舞者的躯干阻尼比没有腰痛病史的舞者要小，但他们有能力通过增加运动想象的阻尼来调节躯干的机械特性，以匹配无痛舞者的机械特性。这些观察结果对于腰痛复发和康复具有潜在的相关性。
PurposeTrunk control is essential in ballet and may be compromised in dancers with a history of low back pain (LBP) by associated changes in motor control. This study aimed to compare trunk mechanical properties between professional ballet dancers with and without a history of LBP. As a secondary aim, we assessed whether asking dancers to use motor imagery to respond in a "fluid" manner could change the mechanical properties of the trunk and whether this was possible for both groups.MethodsTrunk mechanical properties of stiffness and damping were estimated with a linear second-order system, from trunk movement in response to perturbations, in professional ballet dancers with (n = 22) and without (n = 8) a history of LBP. The second-order model adequately described trunk movement in response to the perturbations. Trials were performed with and without motor imagery to respond in a fluid manner to the perturbation.ResultsDancers with a history of LBP had lower damping than dancers without LBP during the standard condition (P = 0.002) but had greater damping during the "fluid" condition (P < 0.001), with values similar to dancers without LBP (P = 0.226). Damping in the dancers without LBP was similar between the conditions (P > 0.99). Stiffness was not different between the dancers with and those without a history of LBP (P = 0.252) but was less during the fluid condition than the standard condition (P < 0.001).ConclusionAlthough dancers with a history of LBP have less trunk damping than those without LBP, they have the capacity to modulate the trunk's mechanical properties to match that of pain-free dancers by increasing damping with motor imagery. These observations have potential relevance for LBP recurrence and rehabilitation.