Enamel multidien biological timing and body size variability among individuals of Chinese Han and Tibetan origins

Hakan Karaaslan, Jeffrey Seckinger, Amel Almabrok, Bin Hu, Hui Dong, Dengsheng Xia, Tsering Dekyi, Russell T. Hogg, Jian Zhou, Timothy G. Bromage

Research output: Contribution to journalArticlepeer-review


Aims: To measure the number of days of enamel formation between periodic striae of Retzius growth lines, the Retzius periodicity (RP), and to compare this multi-day, or multidien rhythm, to body height and weight among people from Beijing, China and Lhasa, Tibet/China. Subjects and methods: Subjects requiring dental extractions from clinics in Beijing, China (N = 338) and Lhasa, Tibet/China (N = 227) provided a tooth and body size information. Multiple observers examined histological sections of the teeth and recorded RP. RP values were statistically compared to body height and weight. Results: In Beijing and Lhasa samples, respectively, average height was 166.38 and 165.70 cm, average weight was 59.53 and 66.53 kg, and average RP was 7.47 and 7.69 d. Statistically significant differences were found between Beijing and Lhasa weight and RP means. Correlations for height and weight against RP were significant, but only comparatively strong for height. Conclusions: Supporting the negative correlation presented in previous studies, RP is negatively associated with height and weight among a large intraspecific sample of people from Beijing and Lhasa. RP represents a metabolic-mediated multidien biological timing mechanism responsible for the rate of cell proliferation and maintenance of the body.

Original languageEnglish (US)
Pages (from-to)1-7
Number of pages7
JournalAnnals of Human Biology
Issue number1
StatePublished - 2020


  • Enamel
  • multidien rhythm
  • striae of Retzius periodicity
  • Body Weight
  • Body Size
  • Humans
  • Middle Aged
  • Periodicity
  • Male
  • Tibet
  • Beijing
  • Young Adult
  • Aged, 80 and over
  • Adult
  • Female
  • Aged
  • Dental Enamel/growth & development

ASJC Scopus subject areas

  • Public Health, Environmental and Occupational Health
  • Genetics
  • Aging
  • Physiology
  • Epidemiology


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