Publication

The Role of Muscle Perfusion in the Age-Associated Decline of Mitochondrial Function in Healthy Individuals.

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Last modified
  • 05/15/2025
Type of Material
Authors
    Fatemeh Adelnia, National Institutes of HealthDonnie Cameron, National Institutes of HealthChristopher M. Bergeron, National Institutes of HealthKenneth W. Fishbein, National Institutes of HealthRichard G. Spencer, National Institutes of HealthDavid Reiter, Emory UniversityLuigi Ferrucci, National Institutes of Health
Language
  • English
Date
  • 2019
Publisher
  • Frontiers Media
Publication Version
Copyright Statement
  • © 2019 Adelnia, Cameron, Bergeron, Fishbein, Spencer, Reiter and Ferrucci.
Final Published Version (URL)
Title of Journal or Parent Work
ISSN
  • 1664-042X
Volume
  • 10
Start Page
  • 427
End Page
  • 427
Grant/Funding Information
  • This work was funded by the Intramural Research Program of the National Institute on Aging, National Institutes of Health, Baltimore, MD, United States.
Supplemental Material (URL)
Abstract
  • Maximum oxidative capacity of skeletal muscle measured by in vivo phosphorus magnetic resonance spectroscopy (31P-MRS) declines with age, and negatively affects whole-body aerobic capacity. However, it remains unclear whether the loss of oxidative capacity is caused by reduced volume and function of mitochondria or limited substrate availability secondary to impaired muscle perfusion. Therefore, we sought to elucidate the role of muscle perfusion on the age-related decline of muscle oxidative capacity and ultimately whole-body aerobic capacity. Muscle oxidative capacity was assessed by 31P-MRS post-exercise phosphocreatine recovery time (τPCr), with higher τPCr reflecting lower oxidative capacity, in 75 healthy participants (48 men, 22-89 years) of the Genetic and Epigenetic Signatures of Translational Aging Laboratory Testing study. Muscle perfusion was characterized as an index of blood volume at rest using a customized diffusion-weighted MRI technique and analysis method developed in our laboratory. Aerobic capacity (peak-VO2) was also measured during a graded treadmill exercise test in the same visit. Muscle oxidative capacity, peak-VO2, and resting muscle perfusion were significantly lower at older ages independent of sex, race, and body mass index (BMI). τPCr was significantly associated with resting muscle perfusion independent of age, sex, race, and BMI (p-value = 0.004, β = -0.34). τPCr was also a significant independent predictor of peak-VO2 and, in a mediation analysis, significantly attenuated the association between muscle perfusion and peak-VO2 (34% reduction for β in perfusion). These findings suggest that the age-associated decline in muscle oxidative capacity is partly due to impaired muscle perfusion and not mitochondrial dysfunction alone. Furthermore, our findings show that part of the decline in whole-body aerobic capacity observed with aging is also due to reduced microvascular blood volume at rest, representing a basal capacity of the microvascular system, which is mediated by muscle oxidative capacity. This finding suggests potential benefit of interventions that target an overall increase in muscle perfusion for the restoration of energetic capacity and mitochondrial function with aging.
Author Notes
Keywords
Research Categories
  • Health Sciences, Radiology
  • Biology, Physiology

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