The effect of bi-iliac breadth on core body temperature

IF 3.1 1区 地球科学 Q1 ANTHROPOLOGY Journal of Human Evolution Pub Date : 2024-09-02 DOI:10.1016/j.jhevol.2024.103580
Jennifer Eyre , Scott A. Williams , Mark Grabowski , Sandra Winters , Herman Pontzer
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Abstract

Thermoregulation is argued to be an important factor influencing body breadth in hominins based on the relationship of surface area to body mass first proposed by Bergmann. Selection for a narrow thorax, and thus a narrow pelvis, increases body surface area relative to body mass, which could be beneficial in hot climates if it leads to a decrease in core body temperature. However, the relationship between pelvic breadth and thermoregulation in humans has not been established. Although previous work has shown that bi-iliac breadth is significantly positively associated with latitude in humans, we lack an understanding of whether this association is due to climate-related selection, neutral evolutionary processes, or other selective pressures. A missing piece of the puzzle is whether body breadth at the iliac blades is an important factor in thermoregulation. Here, we examine this in a mixed-sex sample of 28 adult runners who ran for one hour at 3.14 m s−1 in a variety of climatic conditions while their core body temperatures were measured using internal temperature sensors. The association of maximum core temperature with anthropometric and demographic variables such as age, sex, mass, body fat percentage, and bi-iliac breadth was analyzed using a linear mixed-effect model. Due to the small sample size, the model was also bootstrapped. We found that an increase in absolute bi-iliac breadth was significantly associated with an increase in maximum core temperature. Overall, this preliminary analysis suggests a link between variation in bi-iliac breadth and maximum core body temperature during running, but further investigation is needed.

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髂骨宽度对核心体温的影响
根据伯格曼首次提出的体表面积与体重的关系,体温调节被认为是影响类人猿体宽的一个重要因素。选择狭窄的胸部,从而选择狭窄的骨盆,增加了相对于体重的体表面积,如果这导致核心体温下降,在炎热的气候条件下可能是有益的。然而,人类骨盆宽度与体温调节之间的关系尚未确定。尽管之前的研究表明,人类的双髂骨宽度与纬度呈显著正相关,但我们并不了解这种关联是由于气候相关选择、中性进化过程还是其他选择性压力造成的。谜题中缺少的一块是,髂骨处的体宽是否是体温调节的一个重要因素。在这里,我们对 28 名成年跑步者进行了研究,他们在各种气候条件下以 3.14 米/秒的速度跑步一小时,同时使用体内温度传感器测量他们的核心体温。采用线性混合效应模型分析了最高核心体温与年龄、性别、体重、体脂百分比和双髂宽度等人体测量和人口统计学变量之间的关系。由于样本量较小,该模型还进行了引导分析。我们发现,双髂绝对宽度的增加与最高核心温度的增加有显著关联。总体而言,这项初步分析表明,跑步时双髂宽度的变化与最高核心体温之间存在联系,但仍需进一步研究。
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来源期刊
Journal of Human Evolution
Journal of Human Evolution 生物-进化生物学
CiteScore
6.30
自引率
15.60%
发文量
104
审稿时长
3 months
期刊介绍: The Journal of Human Evolution concentrates on publishing the highest quality papers covering all aspects of human evolution. The central focus is aimed jointly at paleoanthropological work, covering human and primate fossils, and at comparative studies of living species, including both morphological and molecular evidence. These include descriptions of new discoveries, interpretative analyses of new and previously described material, and assessments of the phylogeny and paleobiology of primate species. Submissions should address issues and questions of broad interest in paleoanthropology.
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