Key result
Intramyocellular and extramyocellular lipid contents were significantly correlated with arterial stiffness (baPWV) (R = -0.23 and R = 0.53, respectively; both P < 0.001).
Why the study?
Are intramyocellular and extramyocellular lipid contents associated with arterial stiffness in adults?
Cross-Sectional (n=237)
Are intramyocellular and extramyocellular lipid contents associated with arterial stiffness in adults?
Effect estimate: R = -0.23 (IMCL) and R = 0.53 (EMCL)
p-value: p=<0.001
Intramyocellular and extramyocellular lipid contents are independently associated with arterial stiffness, with differing patterns by gender.
Muscle lipid contents may relate to arterial stiffness; hypothesis-generating and requires prospective validation before clinical relevance.
BACKGROUND: Obese and overweight patients are at increased risk of arterial stiffness, and visceral, epicardial and hepatic fat accumulation is associated with cardiovascular disease risk. In general, muscular lipids are stored either in interstitial adipose tissue (extramyocellular lipid (EMCL)) or in lipid droplets within muscle cells (intramyocellular lipid (IMCL)). However, the association between IMCL or EMCL content and arterial stiffness remains unclear. This cross-sectional study aimed to clarify this association. METHODS: A total of 237 subjects (18-81 years) were enrolled in this study. The IMCL and EMCL contents of the right vastus lateralis muscle were evaluated by proton magnetic resonance spectroscopy. Arterial stiffness was estimated using brachial-ankle pulse wave velocity (baPWV). RESULTS: There were significant correlations between baPWV and the contents of both IMCL (R = -0.23, P < 0.001) and EMCL (R = 0.53, P < 0.001) in all subjects. The baPWV negatively correlated with IMCL content (R = -0.45, P < 0.001) in females only. In contrast, significant positive correlations were observed between baPWV and EMCL content in both males (R = 0.59, P < 0.001) and females (R = 0.55, P < 0.001). IMCL and EMCL contents contributed independently to baPWV variation after adjustment for age, sex, body mass index, visceral and subcutaneous abdominal fat, upper and lower limb fat, blood pressure, heart rate, and lipid profiles. CONCLUSION: These results suggest that IMCL and EMCL contents may be a risk factor for arterial stiffness, and this association differed with gender and age.
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Hasegawa et al. (2015) conducted a cross-sectional in Arterial stiffness (n=237). Intramyocellular and extramyocellular lipids (IMCL and EMCL) was evaluated on Arterial stiffness estimated using brachial-ankle pulse wave velocity (baPWV) (R = -0.23 (IMCL) and R = 0.53 (EMCL), p=<0.001). Intramyocellular and extramyocellular lipid contents were significantly correlated with arterial stiffness (baPWV) (R = -0.23 and R = 0.53, respectively; both P < 0.001).
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