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      Age, waist circumference, and blood pressure are associated with skin microvascular flow motion : The Maastricht Study

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          Abstract

          Skin microvascular flow motion (SMF)--blood flow fluctuation attributed to the rhythmic contraction and dilation of arterioles--is thought to be an important component of the microcirculation, by ensuring optimal delivery of nutrients and oxygen to tissue and regulating local hydraulic resistance. There is some evidence that SMF is altered in obesity, type 2 diabetes mellitus, and hypertension. Nevertheless, most studies of SMF have been conducted in highly selected patient groups, and evidence how SMF relates to other cardiovascular risk factors is scarce. Therefore, the aim of the present study was to examine in a population-based setting which cardiovascular risk factors are associated with SMF.

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          Epidermal thickness at different body sites: relationship to age, gender, pigmentation, blood content, skin type and smoking habits.

          Hans Wulf, Karin T. Poulsen, J Möller (2002)
          Epidermal thickness and its relationship to age, gender, skin type, pigmentation, blood content, smoking habits and body site is important in dermatologic research and was investigated in this study. Biopsies from three different body sites of 71 human volunteers were obtained, and thickness of the stratum corneum and cellular epidermis was measured microscopically using a preparation technique preventing tissue damage. Multiple regressions analysis was used to evaluate the effect of the various factors independently of each other. Mean (SD) thickness of the stratum corneum was 18.3 (4.9) microm at the dorsal aspect of the forearm, 11.0 (2.2) microm at the shoulder and 14.9 (3.4) microm at the buttock. Corresponding values for the cellular epidermis were 56.6 (11.5) microm, 70.3 (13.6) microm and 81.5 (15.7) microm, respectively. Body site largely explains the variation in epidermal thickness, but also a significant individual variation was observed. Thickness of the stratum corneum correlated positively to pigmentation (p = 0.0008) and negatively to the number of years of smoking (p < 0.0001). Thickness of the cellular epidermis correlated positively to blood content (P = 0.028) and was greater in males than in females (P < 0.0001). Epidermal thickness was not correlated to age or skin type.
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            Wavelet analysis of oscillations in the peripheral blood circulation measured by laser Doppler technique.

            A Stefanovska, M Bracic, H D Kvernmo (1999)
            The wavelet transform technique, a time-frequency method with logarithmic frequency resolution, was used to analyze oscillations in human peripheral blood flow measured by laser Doppler flowmetry. The oscillations extended over a wide frequency scale and their periods varied in time. Within the frequency range studied, 0.0095-1.6 Hz, five characteristic oscillations were revealed, arising from both local and central regulatory mechanisms. After the insertion of endothelium-dependent and endothelium-independent vasodilators the spectra of blood flow markedly differed in the frequency interval 0.0095-0.02 Hz. In this way it was demonstrated that endothelial activity is a rhythmic process that contributes to oscillations in blood flow with a characteristic frequency of around 0.01 Hz. The study illustrates the potential of laser Doppler flowmetry combined with dynamical systems analysis for studies of both the micro- and macroscopic mechanisms of blood flow regulation in vivo.
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              Impaired microvascular function in obesity: implications for obesity-associated microangiopathy, hypertension, and insulin resistance.

              R De Jongh, Coen Stehouwer, Greetje de Jong … (2004)
              Obesity is associated with an increased risk of developing microangiopathy, hypertension, and insulin resistance. We hypothesized that obesity is a primary cause of microvascular dysfunction, which may contribute to the development of these obesity-related disorders. We examined microvascular function in 16 lean (body mass index 30 kg/m2) healthy women (mean age, 38.9+/-6.7 years) in the basal state and during physiological systemic hyperinsulinemia. We determined skin capillary recruitment after arterial occlusion with capillaroscopy and skin endothelium-(in)dependent vasodilation by iontophoresis of acetylcholine and sodium nitroprusside. Obese women, compared with lean women, had higher systolic blood pressure (P<0.05), impaired insulin sensitivity (P<0.01), impaired capillary recruitment in the basal state (P<0.05) and during hyperinsulinemia (P<0.05), and impaired acetylcholine-mediated vasodilation in the basal state (P<0.05) and during hyperinsulinemia (P<0.01). Sodium nitroprusside-mediated vasodilation was similar in lean and obese women. Capillary recruitment and acetylcholine-mediated vasodilation were positively correlated with insulin sensitivity (r=0.58, P<0.01 and r=0.55, P<0.01, respectively) and negatively with blood pressure (r=-0.64, P<0.001 and r=-0.42, P<0.05, respectively) in both lean and obese women. Obesity is characterized by impaired microvascular function in the basal state and during hyperinsulinemia and, in both lean and obese women, microvascular dysfunction is associated with increased blood pressure and decreased insulin sensitivity. These findings are consistent with a contribution of impaired microvascular function to the development of obesity-related microangiopathy, hypertension, and insulin resistance.
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                Author and article information

                Journal
                Title: Journal of Hypertension
                Abbreviated Title: Journal of Hypertension
                Publisher: Ovid Technologies (Wolters Kluwer Health)
                ISSN (Print): 0263-6352
                Publication date Created: 2014
                Publication date (Print): December 2014
                Volume: 32
                Issue: 12
                Pages: 2439-2449
                Article
                DOI: 10.1097/HJH.0000000000000348
                PubMed ID: 25222377
                SO-VID: 6442e03b-bccd-443b-b238-e9c430941eed
                Copyright © © 2014
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