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Article Dans Une Revue Scientific Reports Année : 2020

Late subadult ontogeny and adult aging of the human thorax reveals divergent growth trajectories between sexes

Daniel García-Martínez
  • Fonction : Auteur
Markus Bastir
  • Fonction : Auteur
Chiara Villa
  • Fonction : Auteur
Francisco García-Río
  • Fonction : Auteur
Isabel Torres-Sánchez
  • Fonction : Auteur
Wolfgang Recheis
  • Fonction : Auteur
Alon Barash
  • Fonction : Auteur
Roman Hossein Khonsari
  • Fonction : Auteur
Paul O’higgins
  • Fonction : Auteur
Marc Meyer
  • Fonction : Auteur

Résumé

Sexual dimorphism is an important feature of adult thorax morphology, but when and how sex-related differences in the ribcage arise during ontogeny is poorly known. Previous research proposed that sex-related size differences in the nasal region arise during puberty. Therefore, we explore whether ribcage sexual dimorphism also arises at that time and whether this sexual dimorphism is maintained until old age. We measured 526 (semi)landmarks on 80 CT-based human ribcage reconstructions, on individuals ranging from 7 to 65 year-old. The 3D coordinates were submitted to the Procrustes superimposition and analyzed. Our results show that the trajectories of thorax size and shape between sexes diverge at around 12 years of age, and continue slightly diverging until old age. The differential ontogenetic trends cause adult male ribcages to become deeper, shorter, and wider than female. Our results are consistent with the evidence from the cranial respiratory system, with the development of sexual dimorphism probably related to changes in body composition during puberty combined with changes in the reproductive system. Over the last few decades, sexual dimorphism has been identified as an important factor underlaying the variation in form and function of the respiratory apparatus. Soft and hard tissues of the craniofacial respiratory system, the nasal cavity 1-10 , and the postcranial respiratory system, the ribcage 12-26 have all been studied. At the beginning of the XXI century, authors reported significant sexual dimorphism in the sagittal plane of the human skull for a European sample of around 100 individuals, with males having a relatively larger naso-pharyngeal space than females, because of a larger piriform aperture, larger choanae and a more posteriorly inclined occipital clivus 2. Other authors subsequently assessed sex-related differences in the nasal cavity of five different populations from different geographical regions, including cold-adapted populations 4. Interestingly, they found that the sex-specific differences previously observed in the nasal cavity, such as the taller and larger piriform aperture and choanae observed in males compared to females 2 , were common (shared) features observed among human populations 4. These differences were interpreted by the authors as an adaptation to greater oxygen open
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Dates et versions

hal-02985629 , version 1 (16-11-2020)

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Daniel García-Martínez, Markus Bastir, Chiara Villa, Francisco García-Río, Isabel Torres-Sánchez, et al.. Late subadult ontogeny and adult aging of the human thorax reveals divergent growth trajectories between sexes. Scientific Reports, 2020, 10 (1), ⟨10.1038/s41598-020-67664-5⟩. ⟨hal-02985629⟩
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