Biorhythms, deciduous enamel thickness, and primary bone growth in modern human children: a test of the Havers-Halberg Oscillation hypothesis

Mahoney, Patrick, Miszkiewicz, Justyna J., Pitfield, Rosie, Schlecht, Stephen H., Deter, Chris, Guatelli-Steinberg, Debbie (2016) Biorhythms, deciduous enamel thickness, and primary bone growth in modern human children: a test of the Havers-Halberg Oscillation hypothesis. Journal of Anatomy, 228 (6). pp. 919-928. ISSN 0021-8782. E-ISSN 1469-7580. (doi:10.1111/joa.12450) (Access to this publication is currently restricted. You may be able to access a copy if URLs are provided)

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Abstract

Across mammalian species, the periodicity with which enamel layers form (Retzius periodicity) in permanent teeth corresponds with average body mass and the pace of life history. According to the Havers-Halberg Oscillation hypothesis (HHO), Retzius periodicity (RP) is a manifestation of a biorhythm that is also expressed in lamellar bone. Potentially, these links provide a basis for investigating aspects of a species’ biology from fossilized teeth. Here, we tested intra-specific predictions of this hypothesis on skeletal samples of human juveniles. We measured daily enamel growth increments to calculate RP in deciduous molars (n=25). Correlations were sought between RP, molar average and relative enamel thickness (AET, RET), and the average amount of primary bone growth (n=7) in humeri of age-matched juveniles. Results show a previously un-described relationship between RP and enamel thickness. Reduced major axis regression reveals RP is significantly and positively correlated with AET and RET, and scales isometrically. The direction of the correlation was opposite to HHO predictions as currently understood for human adults. Juveniles with higher RPs and thicker enamel had increased primary bone formation, which suggests a coordinating biorhythm. However, the direction of the correspondence was again, opposite to predictions. Next, we compared RP from deciduous molars to new data for permanent molars, and to previously published values. The lowermost RP of four and five days in deciduous enamel extends below the lowermost RP of six days in permanent enamel. A lowered range of RP values in deciduous enamel implies that the underlying biorhythm might change with age. Our results develop the intra-specific HHO hypothesis.

Item Type: Article
DOI/Identification number: 10.1111/joa.12450
Uncontrolled keywords: Retzius lines, primary osteons, microstructure, enamel thickness
Subjects: H Social Sciences
Divisions: Faculties > Social Sciences > School of Anthropology and Conservation
Faculties > Social Sciences > School of Anthropology and Conservation > Biological Anthropology
Depositing User: Patrick Mahoney
Date Deposited: 07 Jan 2016 13:39 UTC
Last Modified: 29 May 2019 16:50 UTC
Resource URI: https://kar.kent.ac.uk/id/eprint/53588 (The current URI for this page, for reference purposes)
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