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J Gerontol A Biol Sci Med Sci. 2018 Jan 16;73(2):175-184. doi: 10.1093/gerona/glx146.

Men Sustain Higher Dysregulation Levels Than Women Without Becoming Frail.

Author information

1
Groupe de recherche PRIMUS, Department of Family Medicine, University of Sherbrooke, Quebec, Canada.
2
Mailman School of Public Health, Columbia University, New York, New York.
3
Translational Gerontology Branch, Longitudinal Studies Section, National Institute on Aging, National Institutes of Health, MedStar Harbor Hospital, Baltimore, Maryland.

Abstract

The aging process differs in important ways between the sexes, with women living longer but at higher risk for frailty (the male-female health-survival paradox). The underlying biological mechanisms remain poorly understood, but may relate to sex differences in physiological dysregulation patterns. Here, using biomarkers from two longitudinal cohort studies (InCHIANTI and BLSA) and one cross-sectional survey (NHANES), we assess sex differences in trajectories of dysregulation globally and for five physiological systems: oxygen transport, electrolytes, hematopoiesis, lipids, and liver/kidney function. We found higher dysregulation levels in men, both globally and in the oxygen transport and hematopoietic systems (p < .001 for all), though differences for other systems were mixed (electrolytes) or absent (lipids and liver/kidney). There was no clear evidence for sex differences in rates of change in dysregulation with age. Although risk of frailty and mortality increase with dysregulation, there was no evidence for differences in these effects between sexes. These findings imply that the greater susceptibility of women to frailty is not simply due to a tolerance for higher dysregulation; rather, it may actually be men that have a greater tolerance for dysregulation, creating a male-female dysregulation-frailty paradox. However, the precise physiological mechanisms underlying the sex differences appear to be diffuse and hard to pin down.

KEYWORDS:

Biomarker; Dysregulation trajectory; Homeostasis; Physiological systems; Statistical distance

PMID:
28977345
PMCID:
PMC5861919
DOI:
10.1093/gerona/glx146
[Indexed for MEDLINE]
Free PMC Article

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