Falkerslev S, Baagø C, Alkjær T, Remvig L, Halkjær-Kristensen J, Larsen P K, Juul-Kristensen B, Simonsen E B
Department of Neuroscience & Pharmacology, University of Copenhagen, Blegdamsvej 3, 2200 Copenhagen N, Denmark.
Clin Biomech (Bristol). 2013 Mar;28(3):318-24. doi: 10.1016/j.clinbiomech.2013.01.006. Epub 2013 Feb 1.
The purpose of the study was to investigate if differences of the head and trunk stability and stabilization strategies exist between subjects classified with Generalized Joint Hypermobility and healthy controls during gait. It was hypothesized that joint hypermobility could lead to decreased head and trunk stability and a head stabilization strategy similar to what have been observed in individuals with decreased locomotor performance.
A comparative study design was used wherein 19 hypermobile children were compared to 19 control children, and 18 hypermobile adults were compared to 18 control adults. The subjects were tested during normal walking and walking on a line. Kinematics of head, shoulder, spine and pelvis rotations were measured by five digital video cameras in order to assess the segmental stability (angular dispersion) and stabilization strategies (anchoring index) in two rotational components: roll and yaw.
Hypermobile children and adults showed decreased lateral trunk stability in both walking conditions. In hypermobile children, it was accompanied with decreased head stability as the head was stabilized by the inferior segment when walking on a line. Several additional differences were observed in stability and stabilization strategies for both children and adults.
Stability of the trunk was decreased in hypermobile children and adults. This may be a consequence of decreased stability of the head. Hypermobile children showed a different mode of head stabilization during more demanding locomotor conditions indicating delayed locomotor development. The findings reflect that Generalized Joint Hypermobility probably include motor control deficits.
本研究的目的是调查在步态过程中，被归类为全身关节过度活动综合征的受试者与健康对照组之间，头部和躯干稳定性及稳定策略是否存在差异。研究假设关节过度活动可能导致头部和躯干稳定性下降，以及一种类似于在运动能力下降个体中观察到的头部稳定策略。
采用比较研究设计，将19名关节过度活动的儿童与19名对照儿童进行比较，将18名关节过度活动的成年人与18名对照成年人进行比较。在正常行走和沿直线行走时对受试者进行测试。使用五台数字摄像机测量头部、肩部、脊柱和骨盆旋转的运动学，以评估两个旋转分量（横滚和偏航）中的节段稳定性（角离散度）和稳定策略（锚定指数）。
关节过度活动的儿童和成年人在两种行走条件下均表现出侧方躯干稳定性下降。在关节过度活动的儿童中，当沿直线行走时，由于头部由下方节段稳定，这伴随着头部稳定性下降。在儿童和成年人的稳定性及稳定策略方面还观察到了其他一些差异。
关节过度活动的儿童和成年人的躯干稳定性下降。这可能是头部稳定性下降的结果。关节过度活动的儿童在更具挑战性的运动条件下表现出不同的头部稳定模式，表明运动发育延迟。研究结果反映出全身关节过度活动综合征可能包括运动控制缺陷。
