Allostatic Load
Allostatic load describes the cumulative physiological costs that may accompany repeated or prolonged adaptation. It connects long-term challenges with changes across multiple bodily systems.
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At a glance
Repeated adaptation may carry a cost.
Allostatic load describes the cumulative physiological costs that may accompany repeated or prolonged adaptation. It connects long-term challenges with changes across multiple bodily systems.
This is a research concept. Fatigue alone, or a single indicator, cannot establish it.
The possible cost of repeated adaptation
The allostatic-load framework connects repeated demands with cumulative physiological costs. Stress mediators can have protective as well as damaging effects, depending on the pattern and context of their activity.[1][2]
A construct, with different measures
A review of reviews documented variation in the measures used to operationalise allostatic load. A study's biomarker panel, thresholds and population matter when interpreting its index.[3]
The biomarker tradition spans neuroendocrine, immune, metabolic and cardiovascular measures. A later analysis across 13 cohorts compared alternative configurations. These studies help explain how AL is operationalized; the resulting indices still need to be interpreted within their populations and methods.[4][5]
From measurement to health outcomes
A mortality meta-analysis found an association with higher AL, with substantial variation between studies. A Chinese CHARLS analysis also linked baseline AL and its change with subsequent cardiovascular disease and mortality in adults aged 45 and older. These are health associations, not estimates of how much benefit an intervention that lowers AL would produce.[6][7]
Interpreting a measurement
To interpret an allostatic load index, examine its biomarkers, reference population and scoring rules. The feature below connects the concept, measurement and health outcomes; individual diagnosis requires clinical assessment.
References
- Bruce S. McEwen, Eliot Stellar (1993). Stress and the individual. Mechanisms leading to disease. Archives of Internal Medicine. https://doi.org/10.1001/archinte.1993.00410180039004
- Bruce S. McEwen (1998). Protective and damaging effects of stress mediators. New England Journal of Medicine. https://doi.org/10.1056/NEJM199801153380307
- Shawna Beese, Julie Postma, Janessa M. Graves (2022). Allostatic Load Measurement: A Systematic Review of Reviews, Database Inventory, and Considerations for Neighborhood Research. International Journal of Environmental Research and Public Health. https://doi.org/10.3390/ijerph192417006
- Robert-Paul Juster, Bruce S. McEwen, Sonia J. Lupien (2010). Allostatic load biomarkers of chronic stress and impact on health and cognition. Neuroscience & Biobehavioral Reviews. https://doi.org/10.1016/j.neubiorev.2009.10.002
- Cathal McCrory, Sinead McLoughlin, Richard Layte, Cliona NiCheallaigh, Aisling M. O’Halloran, Henrique Barros, Lisa F. Berkman, Murielle Bochud, Eileen M. Crimmins, Meagan T. Farrell, Silvia Fraga, Emily Grundy, Michelle Kelly-Irving, Dusan Petrovic, Teresa Seeman, Silvia Stringhini, Peter Vollenveider, Rose Anne Kenny (2023). Towards a consensus definition of allostatic load: a multi-cohort, multi-system, multi-biomarker individual participant data (IPD) meta-analysis. Psychoneuroendocrinology. https://doi.org/10.1016/j.psyneuen.2023.106117
- Haley W. Parker, Alyssa M. Abreu, Mary C. Sullivan, Maya K. Vadiveloo (2022). Allostatic Load and Mortality: A Systematic Review and Meta-Analysis. American Journal of Preventive Medicine. https://doi.org/10.1016/j.amepre.2022.02.003
- Yachao Li, Chu Chen, Ying Wen, Xiuli Wang, Ziqian Zeng, Hongying Shi, Xiaofang Chen, Ruichan Sun, Qingping Xue (2024). Impact of baseline and longitudinal allostatic load changes on incident cardiovascular disease and all-cause mortality: A 7-year population-based cohort study in China. Journal of Affective Disorders. https://doi.org/10.1016/j.jad.2024.03.124
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TAP-CON-0004 · v0.3 · English
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