Cheron G, Bengoetxea A, Bouillot E, Lacquaniti F, Dan B
Laboratory of Movement Biomechanics, ISEPK, Université Libre de Bruxelles, Avenue P. Héger, CP168, Brussels B-1050, Belgium.
Neurosci Lett. 2001 Aug 3;308(2):123-7. doi: 10.1016/s0304-3940(01)01925-5.
We analysed the co-ordination of the elevation angles of the thigh (alpha(t)), shank (alpha(s)) and foot (alpha(f)) during walking in 19 adults and 21 children (aged 11--144 months), including the very first unsupported steps in four. Cross-correlation functions (CCF) maturation of pairs of elevation angles was quantified by a global error parameter (Et((CCF))) reflecting the difference between particular CCF value of toddlers and mean adult value (Ea((CCF))). During the very first step, Et((CCF)) could be five times higher than Ea((CCF)). With walking experience, Et((CCF)) for both alpha(t)-alpha(s) and alpha(s)-alpha(f) pairs evolved following a biexponential profile, with a fast time constant below 6 months. Adult-like CCF parameters were reached earlier for alpha(s)-alpha(f) than alpha(t)-alpha(s), indicating disto-proximal maturation of the temporal co-ordination of the lower limb segments in human locomotion.
我们分析了19名成年人和21名儿童（年龄在11至144个月之间）行走过程中大腿（α(t)）、小腿（α(s)）和足部（α(f)）仰角的协调性，其中包括4名儿童的首次独立行走步骤。通过一个全局误差参数（Et((CCF))）对仰角对的互相关函数（CCF）成熟度进行量化，该参数反映了幼儿特定CCF值与成年人平均值（Ea((CCF))）之间的差异。在第一步中，Et((CCF))可能比Ea((CCF))高五倍。随着行走经验的积累，α(t)-α(s)和α(s)-α(f)对的Et((CCF))均呈双指数曲线变化，快速时间常数低于6个月。α(s)-α(f)比α(t)-α(s)更早达到类似成年人的CCF参数，这表明人类运动中下肢节段时间协调性的成熟是从远端到近端的。
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