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首页> 外文期刊>Journal of applied statistics >Temporal dynamics of inter-limb coordination in ice climbing revealed through change-point analysis of the geodesic mean of circular data
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Temporal dynamics of inter-limb coordination in ice climbing revealed through change-point analysis of the geodesic mean of circular data

机译：通过对圆形数据测地线均值的变化点分析揭示了攀冰中肢间协调的时间动态

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摘要

This study examined the temporal dynamics of the inter-limb angles of skilled and less skilled ice climbers to determine how they explored ice fall properties to adapt their coordination patterns during performance. We observed two circular time series corresponding to the upper- and lower-limbs of seven expert and eight inexperienced ice climbers. We analyzed these data through a multiple change-point analysis of the geodesic (or Frechet) mean on the circle. Guided by the nature of the geodesic mean obtained by an optimization procedure, we extended the filtered derivative method, known to be computationally very cheap and fast, to circular data. Local estimation of the variability was assessed through the number of change-points computed via the filtered derivatives with p-value method for the time series and integrated squared error (ISE). Results of this change-point analysis did not reveal significant differences of the number of change-points between groups but indicated higher ISE that supported the existence of plateaux for beginners. These results emphasized higher local variability of limb angles for experts than for beginners suggesting greater dependence on the properties of the performance environment and adaptive behaviors in the former. Conversely, the lower local variance of limb angles assessed in beginners may reflect their independence of the environmental constraints, as they focused mainly on controlling body equilibrium.
机译：这项研究检查了熟练和不太熟练的攀冰者的下肢间角的时间动态，以确定他们如何探索降冰性质以适应表演过程中的协调方式。我们观察到两个循环时间序列，分别对应于七个专家和八个没有经验的攀冰者的上肢和下肢。我们通过对圆上的测地线（或Frechet）平均值进行多变化点分析来分析这些数据。遵循通过优化过程获得的测地线平均值的性质，我们将滤波后的导数方法（据计算在计算上非常便宜且快速）扩展到了循环数据。通过对时间序列和积分平方误差（ISE）使用p值方法通过滤波后的导数计算出的变化点数来评估变化的局部估计。此变化点分析的结果并未显示组之间变化点数量的显着差异，但表明较高的ISE支持初学者的高原反应。这些结果表明，与初学者相比，专家的肢体角度具有更高的局部可变性，表明前者对表演环境和适应行为的依赖性更大。相反，初学者评估的较低的肢体角局部方差可能反映了他们对环境约束的独立性，因为他们主要侧重于控制身体平衡。

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  • 来源
    《Journal of applied statistics》 |2013年第12期|2317-2331|共15页
  • 作者

    Ludovic Seifert; Jean-Francois Coeurjolly; Romain Herault; Leo Wattebled; Keith Davids;

  • 作者单位

    Faculty of Sports Sciences, Centre d'Etude des Transformations des Activites Physiques et Sportives (CETAPS) - EA 3832, University of Rouen, Mont-Saint-Aignan, France;

    Laboratory Jean Kuntzmann - UMR CNRS 5224, Grenoble University, Grenoble, France;

    Laboratoire d'Informatique, de Traitement de l'Information et des Systemes (LIT1S) - EA 4108, National Institute of Applied Sciences (INSA), Rouen, France;

    Faculty of Sports Sciences, Centre d'Etude des Transformations des Activites Physiques et Sportives (CETAPS) - EA 3832, University of Rouen, Mont-Saint-Aignan, France;

    School of Human Movement Studies, Queensland University of Technology, Brisbane, Australia;

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  • 正文语种 eng
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  • 关键词

    variability analysis; inter-limb coordination; climbing; change-point analysis; geodesic mean; circular data;

    机译：变异性分析;肢间协调;攀登;变更点分析;测地线平均值循环数据;

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