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Sayre MK, Anyawire M, Paolo B, Mabulla AZP, Pontzer H, Wood BM, Raichlen DA. Lifestyle and patterns of physical activity in Hadza foragers. Am J Biol Anthropol 2023; 182:340-356. [PMID: 37728135 PMCID: PMC10720916 DOI: 10.1002/ajpa.24846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/25/2023] [Revised: 08/16/2023] [Accepted: 08/28/2023] [Indexed: 09/21/2023]
Abstract
OBJECTIVES Physically active lifestyles are associated with several health benefits. Physical activity (PA) levels are low in post-industrial populations, but generally high throughout life in subsistence populations. The Hadza are a subsistence-oriented foraging population in Tanzania known for being physically active, but it is unknown how recent increases in market integration may have altered their PA patterns. In this study, we examine PA patterns for Hadza women and men who engage in different amounts of traditional foraging. MATERIALS AND METHODS One hundred and seventy seven Hadza participants (51% female, 19-87 years) wore an Axivity accelerometer (dominant wrist) for ~6 days during dry season months. We evaluated the effects of age, sex, and lifestyle measures on four PA measures that capture different aspects of the PA profile. RESULTS Participants engaged in high levels of both moderate-intensity PA and inactivity. Although PA levels were negatively associated with age, older participants were still highly active. We found no differences in PA between participants living in more traditional "bush" camps and those living in more settled "village" camps. Mobility was positively associated with step counts for female participants, and schooling was positively associated with inactive time for male participants. CONCLUSIONS The similarity in PA patterns between Hadza participants in different camp types suggests that high PA levels characterize subsistence lifestyles generally. The sex-based difference in the effects of mobility and schooling on PA could be a reflection of the Hadza's gender-based division of labor, or indicate that changes to subsistence-oriented lifestyles impact women and men in different ways.
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Affiliation(s)
- M Katherine Sayre
- Human and Evolutionary Biology Section, Department of Biological Sciences, University of Southern California, Los Angeles, California, USA
| | | | | | - Audax Z P Mabulla
- Department of Archaeology and Heritage Studies, University of Dar es Salaam, Dar es Salaam, Tanzania
| | - Herman Pontzer
- Department of Anthropology, Duke University, Durham, North Carolina, USA
- Duke Global Health Institute, Duke University, Durham, North Carolina, USA
| | - Brian M Wood
- Department of Anthropology, University of California Los Angeles, Los Angeles, California, USA
- Department of Human Behavior, Ecology, and Culture, Max Planck Institute for Evolutionary Anthropology, Leipzig, Germany
| | - David A Raichlen
- Human and Evolutionary Biology Section, Department of Biological Sciences, University of Southern California, Los Angeles, California, USA
- Department of Anthropology, University of Southern California, Los Angeles, California, USA
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Raichlen DA, Aslan DH, Sayre MK, Bharadwaj PK, Ally M, Maltagliati S, Lai MHC, Wilcox RR, Klimentidis YC, Alexander GE. Sedentary Behavior and Incident Dementia Among Older Adults. JAMA 2023; 330:934-940. [PMID: 37698563 PMCID: PMC10498332 DOI: 10.1001/jama.2023.15231] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Submit a Manuscript] [Subscribe] [Scholar Register] [Received: 02/20/2023] [Accepted: 07/22/2023] [Indexed: 09/13/2023]
Abstract
Importance Sedentary behavior is associated with cardiometabolic disease and mortality, but its association with dementia is unclear. Objective To investigate whether accelerometer-assessed sedentary behavior is associated with incident dementia. Design, Setting, and Participants A retrospective study of prospectively collected data from the UK Biobank including 49 841 adults aged 60 years or older without a diagnosis of dementia at the time of wearing the wrist accelerometer and living in England, Scotland, or Wales. Follow-up began at the time of wearing the accelerometer (February 2013 to December 2015) and continued until September 2021 in England, July 2021 in Scotland, and February 2018 in Wales. Exposures Mean daily sedentary behavior time (included in the primary analysis) and mean daily sedentary bout length, maximum daily sedentary bout length, and mean number of daily sedentary bouts (included in the secondary analyses) were derived from a machine learning-based analysis of 1 week of wrist-worn accelerometer data. Main Outcome and Measures Incident all-cause dementia diagnosis from inpatient hospital records and death registry data. Cox proportional hazard models with linear and cubic spline terms were used to assess associations. Results A total of 49 841 older adults (mean age, 67.19 [SD, 4.29] years; 54.7% were female) were followed up for a mean of 6.72 years (SD, 0.95 years). During this time, 414 individuals were diagnosed with incident all-cause dementia. In the fully adjusted models, there was a significant nonlinear association between time spent in sedentary behavior and incident dementia. Relative to a median of 9.27 hours/d for sedentary behavior, the hazard ratios (HRs) for dementia were 1.08 (95% CI, 1.04-1.12, P < .001) for 10 hours/d, 1.63 (95% CI, 1.35-1.97, P < .001) for 12 hours/d, and 3.21 (95% CI, 2.05-5.04, P < .001) for 15 hours/d. The adjusted incidence rate of dementia per 1000 person-years was 7.49 (95% CI, 7.48-7.49) for 9.27 hours/d of sedentary behavior, 8.06 (95% CI, 7.76-8.36) for 10 hours/d, 12.00 (95% CI, 10.00-14.36) for 12 hours/d, and 22.74 (95% CI, 14.92-34.11) for 15 hours/d. Mean daily sedentary bout length (HR, 1.53 [95% CI, 1.03-2.27], P = .04 and 0.65 [95% CI, 0.04-1.57] more dementia cases per 1000 person-years for a 1-hour increase from the mean of 0.48 hours) and maximum daily sedentary bout length (HR, 1.15 [95% CI, 1.02-1.31], P = .02 and 0.19 [95% CI, 0.02-0.38] more dementia cases per 1000 person-years for a 1-hour increase from the mean of 1.95 hours) were significantly associated with higher risk of incident dementia. The number of sedentary bouts per day was not associated with higher risk of incident dementia (HR, 1.00 [95% CI, 0.99-1.01], P = .89). In the sensitivity analyses, after adjustment for time spent in sedentary behavior, the mean daily sedentary bout length and the maximum daily sedentary bout length were no longer significantly associated with incident dementia. Conclusions and Relevance Among older adults, more time spent in sedentary behaviors was significantly associated with higher incidence of all-cause dementia. Future research is needed to determine whether the association between sedentary behavior and risk of dementia is causal.
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Affiliation(s)
- David A. Raichlen
- Human and Evolutionary Biology Section, Department of Biological Sciences, University of Southern California, Los Angeles
- Department of Anthropology, University of Southern California, Los Angeles
| | - Daniel H. Aslan
- Human and Evolutionary Biology Section, Department of Biological Sciences, University of Southern California, Los Angeles
| | - M. Katherine Sayre
- Human and Evolutionary Biology Section, Department of Biological Sciences, University of Southern California, Los Angeles
| | | | - Madeline Ally
- Department of Psychology, University of Arizona, Tucson
| | | | - Mark H. C. Lai
- Department of Psychology, University of Southern California, Los Angeles
| | - Rand R. Wilcox
- Department of Psychology, University of Southern California, Los Angeles
| | - Yann C. Klimentidis
- Department of Epidemiology and Biostatistics, Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson
- BIO5 Institute, University of Arizona, Tucson
| | - Gene E. Alexander
- Department of Psychology, University of Arizona, Tucson
- BIO5 Institute, University of Arizona, Tucson
- Evelyn F. McKnight Brain Institute, University of Arizona, Tucson
- Department of Psychiatry, University of Arizona, Tucson
- Neuroscience Graduate Interdisciplinary Program, University of Arizona, Tucson
- Physiological Sciences Graduate Interdisciplinary Program, University of Arizona, Tucson
- Arizona Alzheimer’s Consortium, Phoenix
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Raichlen DA, Klimentidis YC, Sayre MK, Bharadwaj PK, Lai MHC, Wilcox RR, Alexander GE. Leisure-time sedentary behaviors are differentially associated with all-cause dementia regardless of engagement in physical activity. Proc Natl Acad Sci U S A 2022; 119:e2206931119. [PMID: 35994664 PMCID: PMC9436362 DOI: 10.1073/pnas.2206931119] [Citation(s) in RCA: 18] [Impact Index Per Article: 9.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/23/2022] [Accepted: 07/13/2022] [Indexed: 12/28/2022] Open
Abstract
Sedentary behavior (SB) is associated with cardiometabolic disease and mortality, but its association with dementia is currently unclear. This study investigates whether SB is associated with incident dementia regardless of engagement in physical activity (PA). A total of 146,651 participants from the UK Biobank who were 60 years or older and did not have a diagnosis of dementia (mean [SD] age: 64.59 [2.84] years) were included. Self-reported leisure-time SBs were divided into two domains: time spent watching television (TV) or time spent using a computer. A total of 3,507 individuals were diagnosed with all-cause dementia over a mean follow-up of 11.87 (±1.17) years. In models adjusted for a wide range of covariates, including time spent in PA, time spent watching TV was associated with increased risk of incident dementia (HR [95% CI] = 1.24 [1.15 to 1.32]) and time spent using a computer was associated with decreased risk of incident dementia (HR [95% CI] = 0.85 [0.81 to 0.90]). In joint associations with PA, TV time and computer time remained significantly associated with dementia risk at all PA levels. Reducing time spent in cognitively passive SB (i.e., TV time) and increasing time spent in cognitively active SB (i.e., computer time) may be effective behavioral modification targets for reducing risk of dementia regardless of engagement in PA.
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Affiliation(s)
- David A. Raichlen
- Human and Evolutionary Biology Section, Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089
- Department of Anthropology, University of Southern California, Los Angeles, CA 90089
| | - Yann C. Klimentidis
- Department of Epidemiology and Biostatistics, Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, AZ 85724
- BIO5 Institute, University of Arizona, Tucson, AZ 85724
| | - M. Katherine Sayre
- Human and Evolutionary Biology Section, Department of Biological Sciences, University of Southern California, Los Angeles, CA 90089
| | | | - Mark H. C. Lai
- Department of Psychology, University of Southern California, Los Angeles, CA 90089
| | - Rand R. Wilcox
- Department of Psychology, University of Southern California, Los Angeles, CA 90089
| | - Gene E. Alexander
- BIO5 Institute, University of Arizona, Tucson, AZ 85724
- Department of Psychology, University of Arizona, Tucson, AZ 85721
- Evelyn F. McKnight Brain Institute, University of Arizona, Tucson, AZ 85721
- Department of Psychiatry, University of Arizona, Tucson, AZ 85721
- Neuroscience Graduate Interdisciplinary Program, University of Arizona, Tucson, AZ 85721
- Physiological Sciences Graduate Interdisciplinary Program, University of Arizona, Tucson, AZ 85721
- Arizona Alzheimer’s Consortium, Phoenix, AZ 85006
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Raichlen DA, Furlong M, Klimentidis YC, Sayre MK, Parra KL, Bharadwaj PK, Wilcox RR, Alexander GE. Association of Physical Activity with Incidence of Dementia Is Attenuated by Air Pollution. Med Sci Sports Exerc 2022; 54:1131-1138. [PMID: 35704438 PMCID: PMC9204780 DOI: 10.1249/mss.0000000000002888] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/21/2022]
Abstract
INTRODUCTION Physical activity (PA) is recognized as one of the key lifestyle behaviors that reduces risk of developing dementia late in life. However, PA also leads to increased respiration, and in areas with high levels of air pollution, PA may increase exposure to pollutants linked with higher risk of developing dementia. Here, we investigate whether air pollution attenuates the association between PA and dementia risk. METHODS This prospective cohort study included 35,562 adults 60 yrs and older from the UK Biobank. Average acceleration magnitude (ACCave) from wrist-worn accelerometers was used to assess PA levels. Air pollution levels (NO, NO2, PM10, PM2.5, PM2.5-10, and PM2.5 absorbance) were estimated with land use regression methods. Incident all-cause dementia was derived from inpatient hospital records and death registry data. RESULTS In adjusted models, ACCave was associated with reduced risk of developing dementia (HR = 0.71, 95% confidence interval [CI] = 0.60-0.83), whereas air pollution variables were not associated with dementia risk. There were significant interactions between ACCave and PM2.5 (HRinteraction = 1.33, 95% CI = 1.13-1.57) and PM2.5 absorbance (HRinteraction = 1.24, 95% CI = 1.07-1.45) on incident dementia. At the lowest tertiles of pollution, ACCave was associated with reduced risk of incident dementia (HRPM 2.5 = 0.66, 95% CI = 0.49-0.91; HRPM 2.5 absorbance = 0.60, 95% CI = 0.44-0.81). At the highest tertiles of these pollutants, there was no significant association of ACCave with incident dementia (HRPM 2.5 = 0.88, 95% CI = 0.68-1.14; HRPM 2.5 absorbance = 0.79, 95% CI = 0.60-1.04). CONCLUSIONS PA is associated with reduced risk of developing all-cause dementia. However, exposure to even moderate levels of air pollution attenuates the benefits of PA on risk of dementia.
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Affiliation(s)
- David A Raichlen
- Human and Evolutionary Biology Section, Department of Biological Sciences, University of Southern California, CA
| | - Melissa Furlong
- Department of Community, Environment, and Policy, Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, AZ
| | | | - M Katherine Sayre
- Human and Evolutionary Biology Section, Department of Biological Sciences, University of Southern California, CA
| | - Kimberly L Parra
- Department of Epidemiology and Biostatistics, Mel and Enid Zuckerman College of Public Health, University of Arizona, Tucson, AZ
| | | | - Rand R Wilcox
- Department of Psychology, University of Southern California, CA
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Sayre MK, Pontzer H, Alexander GE, Wood BM, Pike IL, Mabulla AZP, Raichlen DA. Ageing and physical function in East African foragers and pastoralists. Philos Trans R Soc Lond B Biol Sci 2020; 375:20190608. [PMID: 32951542 DOI: 10.1098/rstb.2019.0608] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 12/12/2022] Open
Abstract
Human lifespans are exceptionally long compared with those of other primates. A key element in exploring the evolution of human longevity is understanding how modern humans grow older. Our current understanding of common age-related changes in human health and function stems mostly from studies in industrialized societies, where older adulthood is often associated with an increased incidence of chronic diseases. However, individuals who engage in different lifestyles across industrialized and non-industrialized contexts may display variance in age-related changes in health and function. Here, we explore aspects of physical function in a non-industrialized context using three objective measures of physical function. We assessed physical activity levels, walking endurance and muscle strength in two East African populations: Hadza hunter-gatherers in Tanzania and Pokot pastoralists in Kenya. Both Hadza and Pokot participants displayed significant age-related differences in most, but not all, functional measures. Our results suggest that some age-related differences in physical function seen in industrialized contexts could be consistently experienced by most humans, while other age-related differences may vary across populations. Studies of ageing should expand to include a broad range of populations so we can create a more comprehensive understanding of how senescence varies across different lifestyle contexts. This article is part of the theme issue 'Evolution of the primate ageing process'.
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Affiliation(s)
- M Katherine Sayre
- Human and Evolutionary Biology Section, Department of Biological Sciences, University of Southern California, CA 900079, USA
| | - Herman Pontzer
- Department of Evolutionary Anthropology, Duke University, Durham, NC 27708, USA
| | - Gene E Alexander
- Departments of Psychology and Psychiatry, University of Arizona, Tucson, AZ 85721, USA.,Evelyn F. McKnight Brain Institute, University of Arizona, Tucson, AZ 85721, USA.,Neuroscience Graduate Interdisciplinary Program, University of Arizona, Tucson, AZ 85721, USA.,Physiological Sciences Graduate Interdisciplinary Program, University of Arizona, Tucson, AZ 85721, USA.,BIO5 Institute, University of Arizona, Tucson, AZ 85721, USA.,Arizona Alzheimer's Consortium, AZ 85014, USA
| | - Brian M Wood
- Department of Anthropology, University of California Los Angeles, CA 90095, USA.,Department of Human Behavior, Ecology, and Culture, Max Planck Institute for Evolutionary Anthropology, 04103 Leipzig, Germany
| | - Ivy L Pike
- School of Anthropology, University of Arizona, Tucson, AZ 85721, USA
| | - Audax Z P Mabulla
- Department of Archaeology, University of Dar es Salaam, Dar es Salaam, Tanzania
| | - David A Raichlen
- Human and Evolutionary Biology Section, Department of Biological Sciences, University of Southern California, CA 900079, USA
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Sayre MK, Pike IL, Raichlen DA. High levels of objectively measured physical activity across adolescence and adulthood among the Pokot pastoralists of Kenya. Am J Hum Biol 2018; 31:e23205. [DOI: 10.1002/ajhb.23205] [Citation(s) in RCA: 5] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/17/2018] [Revised: 09/10/2018] [Accepted: 11/08/2018] [Indexed: 12/12/2022] Open
Affiliation(s)
| | - Ivy L. Pike
- University of Arizona School of Anthropology Tucson Arizona
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