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European Journal of Applied Physiology

Erschienen in:

01.09.2017 | Original Article

Skeletal muscle mitochondrial mass is linked to lipid and metabolic profile in individuals with spinal cord injury

verfasst von: Laura C. O’Brien, Qun Chen, Jeannie Savas, Edward J. Lesnefsky, Ashraf S. Gorgey

Erschienen in: European Journal of Applied Physiology | Ausgabe 11/2017

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Abstract

Purpose

Changes in metabolism and body composition after spinal cord injury (SCI) predispose individuals to obesity, type II diabetes, and cardiovascular disease. A link between lean mass and skeletal muscle mitochondrial mass has been reported but it is unknown how skeletal muscle mitochondrial mass and activity impact metabolic health. This study examined the relationship between skeletal muscle mitochondrial mass, activity and metabolic profile in individuals with chronic SCI.

Methods

Twenty-two men with motor complete SCI participated in the study. Citrate synthase (CS) and complex III (CIII) activity was measured in vastus lateralis biopsies. Metabolic profile was assessed by intravenous glucose tolerance test, basal metabolic rate (BMR), maximum oxygen uptake (VO₂ peak) and blood lipid profile.

Results

Skeletal muscle CS activity was negatively related to the cholesterol:high density lipoprotein cholesterol (HDL-C) ratio and triglycerides (r = −0.60, p = 0.009; r = −0.64, p = 0.004, respectively). CS activity was positively related to insulin sensitivity and BMR (r = 0.67, p = 0.006; r = 0.64, p = 0.005, respectively). Similar relationships were found for CIII and metabolic profile, but not CIII normalized to CS. Many of the relationships between CS and metabolism remained significant when age, level of injury, or time since injury were accounted for. They also remained significant when CS activity was normalized to total lean mass.

Conclusions

These results suggest that an increase in skeletal muscle mitochondrial mass is associated with improved metabolic health independent of age, level of injury, or time since injury in individuals with chronic SCI. This highlights the importance of maintaining and improving mitochondrial health in individuals with SCI.

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Titel: Skeletal muscle mitochondrial mass is linked to lipid and metabolic profile in individuals with spinal cord injury
verfasst von: Laura C. O’Brien
Qun Chen
Jeannie Savas
Edward J. Lesnefsky
Ashraf S. Gorgey
Publikationsdatum: 01.09.2017
Verlag: Springer Berlin Heidelberg
Erschienen in: European Journal of Applied Physiology / Ausgabe 11/2017
Print ISSN: 1439-6319
Elektronische ISSN: 1439-6327
DOI: https://doi.org/10.1007/s00421-017-3687-9

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Abstract

Purpose

Methods

Results

Conclusions

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