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BMSAP

, Volume 29, Issue 3–4, pp 140–149 | Cite as

The new Coimbra method for recording entheseal changes and the effect of age-at-death

  • C. Y. HendersonEmail author
  • V. Mariotti
  • F. Santos
  • S. Villotte
  • C. A. Wilczak
Article / Article

Abstract

Entheseal changes have been widely used in anthropology to study activity patterns, but there is an increasing awareness that ageing is associated with these changes. The aim of this study was to test each feature of the new Coimbra method for its variability, side asymmetry and its relationship with age. In addition to this, an overall relationship with age was tested for a larger sample. Males 16 and over from the Coimbra skeletal collection of historically identified individuals were recorded using the new method (N = 260). To reduce the impact of occupation, side variability in asymmetry and age were only tested in the labourers (N = 51). All occupation groups were included to test the overall relationship with age using a random forest test. The results show that scores lack variability for many of the features and entheses. Where there is side asymmetry this is typically in favour of higher scores in the right side, excepting the biceps brachii insertion. Most of the features scored show a relationship with ageing, but this is not uniform for all features or entheses. Some features are associated with an increase in age (bone formation and erosions), while others generally occur in younger individuals (fine porosity and textural change). Logistic regression showed that ageing explains at most 44% of the variability. This alongside the side asymmetry may indicate that biomechanics has an explanatory role.

Keywords

Asymmetry Activity-patterns Ageing Degeneration 

La nouvelle méthode Coimbra : changement au niveau des enthèses et influence de l’âge au décès

Résumé

Les changements au niveau des enthèses ont été largement utilisés en anthropologie biologique pour discuter des patterns d’activités, malgré les études de plus en plus fréquentes associant ces changements principalement au vieillissement. L’objectif de cette étude est d’illustrer, pour chacune des modifications enregistrées avec la nouvelle méthode de Coimbra, la distribution générale des scores, l’asymétrie et leur relation à l’âge. Une étude plus globale sur l’effet du vieillissement a également été menée. L’analyse porte sur un échantillon de squelettes de sujets masculins décédés à 16 ans ou plus issus de la collection de squelettes identifiés de Coimbra (n = 260). Pour réduire l’influence de l’activité physique, seuls les sujets avec la profession de « trabalhador » (travailleur) ont été utilisés dans les tests sur l’asymétrie et l’âge (n = 51). Pour l’étude globale sur l’effet du vieillissement, toutes les professions ont été incluses dans une analyse utilisant les forêts aléatoires. Les résultats montrent que la variabilité des scores est faible pour la plupart des changements et des enthèses. Il existe une asymétrie assez claire avec des scores plus élevés du côté droit, sauf pour l’insertion du biceps brachii. La plupart des changements enregistrés présentent une corrélation positive avec l’âge au décès, sans toutefois être systématiques pour tous les changements ou toutes les enthèses considérées. Certains changements sont plus fréquents chez les sujets âgés (formation osseuse, érosion), alors que d’autres se retrouvent plus souvent chez les jeunes sujets (porosité fine et changement mineur de surface). Une régression logistique montre que le vieillissement explique au mieux 44 % de la variabilité perçue. Cela, ainsi que l’asymétrie directionnelle observée, pourrait indiquer que les phénomènes biomécaniques jouent un rôle dans l’apparition de ces changements.

Mots clés

Asymétrie Pattern d’activités Vieillissement Dégénération 

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Copyright information

© Société d'anthropologie de Paris et Lavoisier 2017

Authors and Affiliations

  • C. Y. Henderson
    • 1
    Email author
  • V. Mariotti
    • 2
    • 3
  • F. Santos
    • 4
  • S. Villotte
    • 4
  • C. A. Wilczak
    • 5
  1. 1.CIAS – Research Centre for Anthropology and Health, Department of Life SciencesUniversity of Coimbra, Calçada Martim de Freitas, Edíficio de São BentoCoimbraPortugal
  2. 2.Laboratorio di Bioarcheologia ed Osteologia Forense – Antropologia, Dipartimento di Scienze BiologicheGeologiche e Ambientali-Alma Mater Studiorum Università di BolognaBolognaItalia
  3. 3.ADÉS, UMR 7268 CNRS/Aix-Marseille université/EFSAix-Marseille universitéMarseille cedex 15France
  4. 4.CNRS, UMR 5199 PACEA, bâtiment B8, allée Geoffroy-Saint-Hilaireuniversité de BordeauxPessac cedexFrance
  5. 5.Department of AnthropologySan Francisco State UniversitySan FranciscoUSA

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