TY - JOUR
T1 - Hydration in relation to water insecurity, heat index, and lactation status in two small-scale populations in hot-humid and hot-arid environments
AU - Bethancourt, Hilary J.
AU - Swanson, Zane S.
AU - Nzunza, Rosemary
AU - Huanca, Tomas
AU - Conde, Esther
AU - Kenney, W. Larry
AU - Young, Sera L.
AU - Ndiema, Emmanuel
AU - Braun, David
AU - Pontzer, Herman
AU - Rosinger, Asher Y.
N1 - Funding Information:
The authors would like to thank the Gran Consejo Tsimane, the Kenya Medical Research Institute, the National Museums of Kenya, the Ileret Health Clinic, our translators (Manuel Roca Moye, Elias Hiza Nate, Robin Nate Roca, Luke Lomeiku, Samuel Esho, and Joshua Koribok), research assistants (Jessica Saunders, Shiva Dhanasekar, Celine LaTona, Alysha Kelyman, Jason John), community leaders from each participating community, and all study participants. This work was funded by the National Science Foundation (NSF ARCH #1624398; NSF REU #1930719; NSF CNH2-S #1924322) and a Pennsylvania State University Social Science Research Institute (SSRI) Human Health and Environment Seed Grant and funds from the College of Health and Human Development.
Funding Information:
The authors would like to thank the Gran Consejo Tsimane, the Kenya Medical Research Institute, the National Museums of Kenya, the Ileret Health Clinic, our translators (Manuel Roca Moye, Elias Hiza Nate, Robin Nate Roca, Luke Lomeiku, Samuel Esho, and Joshua Koribok), research assistants (Jessica Saunders, Shiva Dhanasekar, Celine LaTona, Alysha Kelyman, Jason John), community leaders from each participating community, and all study participants. This work was funded by the National Science Foundation (NSF ARCH #1624398; NSF REU #1930719; NSF CNH2‐S #1924322) and a Pennsylvania State University Social Science Research Institute (SSRI) Human Health and Environment Seed Grant and funds from the College of Health and Human Development.
Funding Information:
National Science Foundation, Grant/Award Numbers: NSF ARCH #1624398, NSF CNH2‐S #1924322, NSF REU #1930719; Pennsylvania State University Social Science Research Institute (SSRI) Human Health and Environment Seed Grant, Grant/Award Number: N/A Funding information
Publisher Copyright:
© 2020 Wiley Periodicals LLC
PY - 2021/1/1
Y1 - 2021/1/1
N2 - Objectives: This study compared the prevalence of concentrated urine (urine specific gravity ≥1.021), an indicator of hypohydration, across Tsimane' hunter-forager-horticulturalists living in hot-humid lowland Bolivia and Daasanach agropastoralists living in hot-arid Northern Kenya. It tested the hypotheses that household water and food insecurity would be associated with higher odds of hypohydration. Methods: This study collected spot urine samples and corresponding weather data along with data on household water and food insecurity, demographics, and health characteristics among 266 Tsimane' households (N = 224 men, 235 women, 219 children) and 136 Daasanach households (N = 107 men, 120 women, 102 children). Results: The prevalence of hypohydration among Tsimane' men (50.0%) and women (54.0%) was substantially higher (P <.001) than for Daasanach men (15.9%) and women (17.5%); the prevalence of hypohydration among Tsimane' (37.0%) and Daasanach (31.4%) children was not significantly different (P =.33). Multiple logistic regression models suggested positive but not statistically significant trends between household water insecurity and odds of hypohydration within populations, yet some significant joint effects of water and food insecurity were observed. Heat index (2°C) was associated with a 23% (95% confidence interval [CI]: 1.09-1.40, P =.001), 34% (95% CI: 1.18-1.53, P <.0005), and 23% (95% CI: 1.04-1.44, P =.01) higher odds of hypohydration among Tsimane' men, women, and children, respectively, and a 48% (95% CI: 1.02-2.15, P =.04) increase in the odds among Daasanach women. Lactation status was also associated with hypohydration among Tsimane' women (odds ratio = 3.35, 95% CI: 1.62-6.95, P =.001). Conclusion: These results suggest that heat stress and reproductive status may have a greater impact on hydration status than water insecurity across diverse ecological contexts.
AB - Objectives: This study compared the prevalence of concentrated urine (urine specific gravity ≥1.021), an indicator of hypohydration, across Tsimane' hunter-forager-horticulturalists living in hot-humid lowland Bolivia and Daasanach agropastoralists living in hot-arid Northern Kenya. It tested the hypotheses that household water and food insecurity would be associated with higher odds of hypohydration. Methods: This study collected spot urine samples and corresponding weather data along with data on household water and food insecurity, demographics, and health characteristics among 266 Tsimane' households (N = 224 men, 235 women, 219 children) and 136 Daasanach households (N = 107 men, 120 women, 102 children). Results: The prevalence of hypohydration among Tsimane' men (50.0%) and women (54.0%) was substantially higher (P <.001) than for Daasanach men (15.9%) and women (17.5%); the prevalence of hypohydration among Tsimane' (37.0%) and Daasanach (31.4%) children was not significantly different (P =.33). Multiple logistic regression models suggested positive but not statistically significant trends between household water insecurity and odds of hypohydration within populations, yet some significant joint effects of water and food insecurity were observed. Heat index (2°C) was associated with a 23% (95% confidence interval [CI]: 1.09-1.40, P =.001), 34% (95% CI: 1.18-1.53, P <.0005), and 23% (95% CI: 1.04-1.44, P =.01) higher odds of hypohydration among Tsimane' men, women, and children, respectively, and a 48% (95% CI: 1.02-2.15, P =.04) increase in the odds among Daasanach women. Lactation status was also associated with hypohydration among Tsimane' women (odds ratio = 3.35, 95% CI: 1.62-6.95, P =.001). Conclusion: These results suggest that heat stress and reproductive status may have a greater impact on hydration status than water insecurity across diverse ecological contexts.
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U2 - 10.1002/ajhb.23447
DO - 10.1002/ajhb.23447
M3 - Article
C2 - 32583580
AN - SCOPUS:85087208644
SN - 1042-0533
VL - 33
JO - American Journal of Human Biology
JF - American Journal of Human Biology
IS - 1
M1 - e23447
ER -
