scholarly journals Decreasing human body temperature in the United States since the Industrial Revolution

2019 ◽  
Author(s):  
Myroslava Protsiv ◽  
Catherine Ley ◽  
Joanna Lankester ◽  
Trevor Hastie ◽  
Julie Parsonnet
Keyword(s):  
Body Temperature ◽  
Industrial Revolution ◽  
The United States ◽  
Time Of Day ◽  
Human Longevity ◽  
Union Army ◽  
Mean Body Temperature ◽  
Health And Nutrition ◽  
The Us ◽  
Human Body Temperature

ABSTRACTIn the US, the normal, oral temperature of adults is, on average, lower than the canonical 37°C established in the 19th century. We postulated that body temperature has decreased over time. Using measurements from three cohorts--the Union Army Veterans of the Civil War (N=23,710; measurement years 1860-1940), the National Health and Nutrition Examination Survey I (N=15,301; 1971-1975), and the Stanford Translational Research Integrated Database Environment (N=150,280; 2007-2017)--we determined that mean body temperature in men and women, after adjusting for age, height, weight and, in some models date and time of day, has decreased monotonically by 0.03°C per birth decade. A similar decline within the Union Army cohort as between cohorts, makes measurement error an unlikely explanation. This substantive and continuing shift in body temperature—a marker for metabolic rate—provides a framework for understanding changes in body habitus and human longevity over the last 200 years.

scholarly journals Decreasing human body temperature in the United States since the Industrial Revolution

eLife ◽  
2020 ◽  
Vol 9 ◽  
Author(s):  
Myroslava Protsiv ◽  
Catherine Ley ◽  
Joanna Lankester ◽  
Trevor Hastie ◽  
Julie Parsonnet
Keyword(s):  
Body Temperature ◽  
Industrial Revolution ◽  
The United States ◽  
Time Of Day ◽  
Union Army ◽  
Oral Temperature ◽  
Mean Body Temperature ◽  
Health And Nutrition ◽  
The Us ◽  
Human Body Temperature

In the US, the normal, oral temperature of adults is, on average, lower than the canonical 37°C established in the 19th century. We postulated that body temperature has decreased over time. Using measurements from three cohorts—the Union Army Veterans of the Civil War (N = 23,710; measurement years 1860–1940), the National Health and Nutrition Examination Survey I (N = 15,301; 1971–1975), and the Stanford Translational Research Integrated Database Environment (N = 150,280; 2007–2017)—we determined that mean body temperature in men and women, after adjusting for age, height, weight and, in some models date and time of day, has decreased monotonically by 0.03°C per birth decade. A similar decline within the Union Army cohort as between cohorts, makes measurement error an unlikely explanation. This substantive and continuing shift in body temperature—a marker for metabolic rate—provides a framework for understanding changes in human health and longevity over 157 years.

scholarly journals Decreasing Human Body Temperature in the United States Since the Industrial Revolution

2019 ◽  
Author(s):  
Myroslava Protsiv ◽  
Catherine Ley ◽  
Joanna Lankester ◽  
Trevor Hastie ◽  
Julie Parsonnet
Keyword(s):  
United States ◽  
Body Temperature ◽  
Human Body ◽  
Industrial Revolution ◽  
The United States ◽  
Human Body Temperature

scholarly journals Author response: Decreasing human body temperature in the United States since the Industrial Revolution

2019 ◽  
Author(s):  
Myroslava Protsiv ◽  
Catherine Ley ◽  
Joanna Lankester ◽  
Trevor Hastie ◽  
Julie Parsonnet
Keyword(s):  
United States ◽  
Body Temperature ◽  
Human Body ◽  
Industrial Revolution ◽  
The United States ◽  
Author Response ◽  
Human Body Temperature

3. The US rise to world power, 1776–1945

2012 ◽  
Author(s):  
Walter LaFeber
Keyword(s):  
United States ◽  
Civil War ◽  
Industrial Revolution ◽  
The United States ◽  
Thomas Jefferson ◽  
Territorial Expansion ◽  
War Of Independence ◽  
World Power ◽  
The Us ◽  
The Cold War

This chapter examines how the United States evolved as a world power during the period 1776–1945. It first considers how Americans set out after the War of Independence to establish a continental empire. Thomas Jefferson called this an ‘empire for liberty’, but by the early nineteenth century the United States had become part of an empire containing human slavery. Abraham Lincoln determined to stop the territorial expansion of this slavery and thus helped bring about the Civil War. The reunification of the country after the Civil War, and the industrial revolution which followed, turned the United States into the world’s leading economic power by the early twentieth century. The chapter also discusses Woodrow Wilson’s empire of ideology and concludes with an analysis of U.S. economic depression and the onset of the Cold War.

scholarly journals Rapidly declining body temperature in a tropical human population

2020 ◽  
Vol 6 (44) ◽  
pp. eabc6599 ◽  
Author(s):  
Michael Gurven ◽  
Thomas S. Kraft ◽  
Sarah Alami ◽  
Juan Copajira Adrian ◽  
Edhitt Cortez Linares ◽  
...  
Keyword(s):  
Physical Activity ◽  
Body Temperature ◽  
Human Population ◽  
Thermal Environment ◽  
The United States ◽  
Antibiotic Usage ◽  
Early 21St Century ◽  
The Past ◽  
Human Body Temperature ◽  
Normal Human

Normal human body temperature (BT) has long been considered to be 37.0°C. Yet, BTs have declined over the past two centuries in the United States, coinciding with reductions in infection and increasing life expectancy. The generality of and reasons behind this phenomenon have not yet been well studied. Here, we show that Bolivian forager-farmers (n = 17,958 observations of 5481 adults age 15+ years) inhabiting a pathogen-rich environment exhibited higher BT when first examined in the early 21st century (~37.0°C). BT subsequently declined by ~0.05°C/year over 16 years of socioeconomic and epidemiological change to ~36.5°C by 2018. As predicted, infections and other lifestyle factors explain variation in BT, but these factors do not account for the temporal declines. Changes in physical activity, body composition, antibiotic usage, and thermal environment are potential causes of the temporal decline.

scholarly journals Dietary Sodium Intake and Sodium Density in the United States: Estimates From NHANES 2005–2006 and 2015–2016

2020 ◽  
Vol 33 (9) ◽  
pp. 825-830
Author(s):  
Jiun-Ruey Hu ◽  
Shivani Sahni ◽  
Kenneth J Mukamal ◽  
Courtney L Millar ◽  
Yingfei Wu ◽  
...  
Keyword(s):  
United States ◽  
Odds Ratio ◽  
Sodium Intake ◽  
The United States ◽  
Dietary Sodium ◽  
Health And Nutrition ◽  
Hispanic Adults ◽  
The Us ◽  
The Difference ◽  
Total Sodium

Abstract BACKGROUND In the United States, current guidelines recommend a total sodium intake <2,300 mg/day, a guideline which does not consider kilocalorie intake. However, kilocalorie intake varies substantially by age and sex. We hypothesized that compared with sodium density, total sodium intake overestimates adherence to sodium recommendations, especially in adults consuming fewer kilocalories. METHODS In the National Health and Nutrition Examination Survey (NHANES), we estimated the prevalence of adherence to sodium intake recommendations (<2,300 mg/day) and corresponding sodium density intake (<1.1 mg/kcal = 2,300 mg at 2,100 kcal) by sex, age, race/ethnicity, and kilocalorie level. Adherence estimates were compared between the 2005–2006 (n = 5,060) and 2015–2016 (n = 5,266) survey periods. RESULTS In 2005–2006, 23.1% (95% confidence interval [CI]: 21.5, 24.9) of the US population consumed <2,300 mg of sodium/day, but only 8.5% (CI: 7.6, 9.4) consumed <1.1 mg/kcal in sodium density. In 2015–2016, these figures were 20.9% (CI: 18.8, 23.2) and 5.1% (CI: 4.4, 6.0), respectively. In 2015–2016, compared with 2005–2006, adherence by sodium density decreased more substantially (odds ratio = 0.59; CI: 0.48, 0.72; P < 0.001) than adherence by total sodium consumption (odds ratio = 0.85; CI: 0.73, 0.98; P = 0.03). The difference in adherence between total sodium and sodium density goals was greater among those with lower kilocalorie intake, namely, older adults, women, and Hispanic adults. CONCLUSIONS Adherence estimated by sodium density is substantially less than adherence estimated by total sodium intake, especially among persons with lower kilocalorie intake. Further efforts to achieve population-wide reduction in sodium density intake are urgently needed.

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