Climatic influences on human body size and proportions: Ecological adaptations and secular trends

Peter T. Katzmarzyk*, William R. Leonard

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

230 Scopus citations

Abstract

This study reevaluates the long-standing observation that human morphology varies with climate. Data on body mass, the body mass index [BMI; mass (kg)/stature (m)2], the surface area/body mass ratio, and relative sitting height (RSH; sitting height/stature) were obtained for 223 male samples and 195 female samples derived from studies published since D.F. Roberts' landmark paper 'Body weight, race, and climate' in 1953 (Am. J. Phys. Anthropol. 11:533-558). Current analyses indicate that body mass varies inversely with mean annual temperature in males (r = -0.27, P < 0.001) and females (r = -0.28, P < 0.001), as does the BMI (males: r = -0.22, P = 0.001; females: r = -0.30, P < 0.001): The surface area/body mass ratio is positively correlated with temperature in both sexes (males: r = 0.29, P < 0.001; females: r = 0.34, P < 0.001), whereas the relationship between RSH and temperature is negative (males: r = -0.37, P < 0.001; females: r = - 0.46, P < 0.001). These results are consistent with previous work showing that humans follow the ecological rules of Bergmann and Allen. However, the slope of the best-fit regressions between measures of body mass (i.e., mass, BMI, and surface area/mass) and temperature are more modest than those presented by Roberts. These differences appear to be attributable to secular trends in mass, particularly among tropical populations. Body mass and the BMI have increased over the last 40 years, whereas the surface area/body mass ratio has decreased. These findings indicate that, although climatic factors continue to be significant correlates of world-wide variation in human body size and morphology, differential changes in nutrition among tropical, developing world populations have moderated their influence.

Original languageEnglish (US)
Pages (from-to)483-503
Number of pages21
JournalAmerican Journal of Physical Anthropology
Volume106
Issue number4
DOIs
StatePublished - Aug 1 1998

Keywords

  • Adaptation
  • Ecological rules
  • Evolution
  • Morphology
  • Surface area
  • Thermoregulation

ASJC Scopus subject areas

  • Anatomy
  • Anthropology

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