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  • 1
    Online Resource
    Online Resource
    S. Karger AG ; 2011
    In:  Gerontology Vol. 57, No. 5 ( 2011), p. 387-396
    In: Gerontology, S. Karger AG, Vol. 57, No. 5 ( 2011), p. 387-396
    Abstract: 〈 i 〉 Background: 〈 /i 〉 Insulin resistance, i.e. impaired insulin sensitivity, and type 2 diabetes are more prevalent in elderly humans. Both conditions relate to lower aerobic performance and increased body fatness, which have been linked to reduced mitochondrial oxidative capacity. Thus, lower insulin sensitivity in the elderly could result from age-related diminished energy metabolism or from lifestyle-related abnormalities. 〈 i 〉 Objective: 〈 /i 〉 This review addresses the question whether insulin sensitivity and mitochondrial oxidative capacity are independently affected during aging and type 2 diabetes. 〈 i 〉 Methods: 〈 /i 〉 Only studies were analyzed which included elderly persons and employed state-of-the-art methodology to assess insulin sensitivity and oxidative capacity, e.g. electron microscopic imaging, in vivo magnetic resonance spectroscopy or ex vivo high-resolution respirometry. 〈 i 〉 Results: 〈 /i 〉 Humans with or at risk of type 2 diabetes frequently exhibit insulin resistance along with structural and functional abnormalities of muscular mitochondria. Low mitochondrial oxidative capacity causes muscular fat accumulation, which impedes insulin signaling via lipid intermediates, in turn affecting oxidative capacity. However, insulin sensitivity is not generally reduced with age, when groups are carefully matched for physical activity and body fatness. Moreover, lifestyle intervention studies revealed discordant responses of mitochondrial oxidative capacity and insulin sensitivity. 〈 i 〉 Conclusions: 〈 /i 〉 In the elderly, low mitochondrial oxidative capacity likely results from age-related effects acquired during life span. Insulin resistance occurs independently of age mostly due to unhealthy lifestyle on top of genetic predisposition. Thus, insulin sensitivity and mitochondrial function may not be causally related, but mutually amplify each other during aging.
    Type of Medium: Online Resource
    ISSN: 0304-324X , 1423-0003
    Language: English
    Publisher: S. Karger AG
    Publication Date: 2011
    detail.hit.zdb_id: 1482689-6
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  • 2
    In: Respiration, S. Karger AG, Vol. 96, No. 1 ( 2018), p. 29-40
    Abstract: 〈 b 〉 〈 i 〉 Background: 〈 /i 〉 〈 /b 〉 Diabetes mellitus is a significant comorbidity of interstitial lung disease (ILD). 〈 b 〉 〈 i 〉 Objectives: 〈 /i 〉 〈 /b 〉 The aim of this study was to investigate the incidence of restrictive lung disease (RLD) and ILD in patients with prediabetes and type 2 diabetes (T2D). 〈 b 〉 〈 i 〉 Methods: 〈 /i 〉 〈 /b 〉 Forty-eight nondiabetics, 68 patients with prediabetes, 29 newly diagnosed T2D, and 110 patients with long-term T2D were examined for metabolic control, diabetes-related complications, breathlessness, and lung function. Five participants with T2D, breathlessness, and RLD underwent multidetector computed tomography (MDCT) and a Six-Minute Walk Test (6MWT). Lung tissue from 4 patients without diabetes and from 3 patients with T2D was histologically examined for presence of pulmonary fibrosis. 〈 b 〉 〈 i 〉 Results: 〈 /i 〉 〈 /b 〉 Breathlessness in combination with RLD was significantly increased in patients with prediabetes and T2D ( 〈 i 〉 p 〈 /i 〉 & #x3c; 0.01). RLD was found in 9% of patients with prediabetes, in 20% of patients with newly diagnosed T2D, and in 27% of patients with long-term T2D. Thus, patients with long-term T2D had an increased risk of RLD (OR 5.82 [95% CI 1.71–20.5], 〈 i 〉 p 〈 /i 〉 & #x3c; 0.01). RLD was significantly associated with glucose metabolism and albuminuria ( 〈 i 〉 p 〈 /i 〉 & #x3c; 0.01); furthermore, presence of nephropathy increased the risk of RLD (OR 8.57 [95% CI 3.4–21.9], 〈 i 〉 p 〈 /i 〉 & #x3c; 0.01) compared to nondiabetics. MDCT revealed ILD in 4 patients, the 6MWT correlated with the extent of ILD, and histological analysis showed fibrosing ILD in patients with T2D. 〈 b 〉 〈 i 〉 Conclusions: 〈 /i 〉 〈 /b 〉 This study demonstrates increased breathlessness and a high prevalence of RLD in patients with T2D, indicating an association between diabetes and fibrosing ILD.
    Type of Medium: Online Resource
    ISSN: 0025-7931 , 1423-0356
    Language: English
    Publisher: S. Karger AG
    Publication Date: 2018
    detail.hit.zdb_id: 1464419-8
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