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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">Cardiovascular disease in children is becoming ever more common&#44; in parallel with the increasing prevalence of childhood obesity&#46; Tracking of childhood obesity to adulthood increases the risk of developing cardiovascular disease&#44; and by 2035&#44; the number of excess cardiovascular events attributable to adolescent overweight in the USA is expected to exceed 100<span class="elsevierStyleHsp" style=""></span>000 a year&#46;<a class="elsevierStyleCrossRefs" href="#bib0110"><span class="elsevierStyleSup">1&#44;2</span></a> There is thus an urgent need to focus on this problem&#44; in order to prevent cardiovascular disease from affecting children at ever younger ages&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">The article by Gulgun et al&#46;<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">3</span></a> in this issue of the <span class="elsevierStyleItalic">Journal</span> on the relationship between the levels of different types of erythrocyte membrane fatty acids and cardiac autonomic dysfunction in pubertal children is thus of considerable interest&#44; especially as it deals with the effects of obesity on the autonomic nervous system rather than with the more commonly discussed impact on premature development and accelerated cardiovascular atherosclerosis&#44;<a class="elsevierStyleCrossRef" href="#bib0125"><span class="elsevierStyleSup">4</span></a> including in childhood&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">The authors of this case-control study&#44; which included 48 obese and 32 healthy pubertal children aged 11&#46;95&#177;2&#46;42 and 12&#46;48&#177;2&#46;27 years&#44; respectively&#44; conclude that the differences they found between these groups in levels of omega-6 essential fatty acids may play a role in impairment of autonomic cardiac function in obese children&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">It has been known for over twenty years that dietary fat intake can influence the fatty acid composition of cell membranes&#44;<a class="elsevierStyleCrossRef" href="#bib0130"><span class="elsevierStyleSup">5</span></a> changes in which can affect the membranes&#8217; structural characteristics&#44; particularly the function of membrane proteins&#44; and this in turn can have important effects on cell metabolism and other physiological processes&#46;<a class="elsevierStyleCrossRef" href="#bib0135"><span class="elsevierStyleSup">6</span></a> Escriba et al&#46;<a class="elsevierStyleCrossRef" href="#bib0140"><span class="elsevierStyleSup">7</span></a> showed that changes in the lipid composition of cell membranes in hypertensive patients affected signaling proteins involved in control of blood pressure&#46; At the same time&#44; obesity itself causes a highly pro-oxidant metabolic state that can also contribute to structural and functional alterations in the cell membrane through lipid peroxidation&#46;<a class="elsevierStyleCrossRef" href="#bib0145"><span class="elsevierStyleSup">8</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">It is generally accepted that measurement of plasma fatty acid levels merely reflects the quality of recent dietary fat intake and is also subject to various other influences from diet&#46; Since the fatty acid composition of the erythrocyte membrane appears to remain constant throughout the life of the cell &#40;around 120 days&#41;&#44; measuring this will give a more consistent result&#44; and thus a better indication of medium- to long-term intake&#46; This was the approach adopted by Gulgun et al&#46;<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">3</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">As an illustration of the complexity of this subject&#44; as well as being ingested in food&#44; fatty acids can also be synthesized endogenously&#44; through a process known as de novo lipogenesis&#46; This is an adaptive mechanism in situations of excessive dietary intake of carbohydrate&#44; which is converted into fatty acids and triglycerides&#44; especially in obese individuals&#46; In de novo lipogenesis&#44; endogenous acetyl-CoA is used to produce saturated fatty acids&#44; which are then elongated and&#47;or desaturated to varying degrees&#46;<a class="elsevierStyleCrossRef" href="#bib0150"><span class="elsevierStyleSup">9</span></a></p><p id="par0035" class="elsevierStylePara elsevierViewall">The erythrocyte membrane lipid profile in obese adolescents is characterized by a high cholesterol&#47;phospholipid ratio&#44; increased saturated fatty acid levels and lower levels of mono- and polyunsaturated fatty acids&#44; leading to a significantly reduced unsaturation index&#46;<a class="elsevierStyleCrossRefs" href="#bib0135"><span class="elsevierStyleSup">6&#44;10</span></a> As pointed out above&#44; it is thus logical that such alterations would directly affect flow properties and lipid peroxidation conditions in these membranes&#44; and this has in fact been demonstrated experimentally&#46; Several studies have also shown that low omega-3 fatty acid levels exacerbate the low-level inflammatory state found in adolescent obesity&#44; and that erythrocyte membrane eicosapentaenoic acid levels are inversely correlated with insulin resistance&#46;<a class="elsevierStyleCrossRef" href="#bib0160"><span class="elsevierStyleSup">11</span></a> Various mechanisms have been put forward to explain this association&#44; including competition between glucose and fatty acids as oxidation substrates&#44; inhibition of glucose transport and&#47;or phosphorylation&#44; and release of fatty acids into the portal circulation as a result of lipolytic activity by visceral adipose tissue and release of hormones and cytokines&#44;<a class="elsevierStyleCrossRef" href="#bib0150"><span class="elsevierStyleSup">9</span></a> as also noted by Gulgun et al&#46;&#44; although this was not reflected in their results because their study population did not include insulin-resistant obese subjects&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">In recent years&#44; several epidemiological studies have produced evidence of impaired cardiac autonomic modulation &#40;CAM&#41; in obese children&#46; Autonomic activity in humans has a circadian rhythm&#44; with predominantly parasympathetic activity at night and predominantly sympathetic activity during the day&#46;<a class="elsevierStyleCrossRef" href="#bib0165"><span class="elsevierStyleSup">12</span></a> CAM reflects the balance between the sympathetic and parasympathetic systems&#44; but in obese children&#44; reduced parasympathetic activity may be seen compared to normal weight children&#46;<a class="elsevierStyleCrossRef" href="#bib0170"><span class="elsevierStyleSup">13</span></a> However&#44; other studies have shown impairment of CAM not only through reduced parasympathetic activity&#44; but also through absolute or relative sympathetic hyperactivity or preponderance in obese children&#46;<a class="elsevierStyleCrossRef" href="#bib0175"><span class="elsevierStyleSup">14</span></a></p><p id="par0045" class="elsevierStylePara elsevierViewall">The cardiac autonomic nervous system can be assessed non-invasively&#44; simply and reproducibly through analysis of heart rate variability &#40;HRV&#41;&#44; which measures the extent of variation between heartbeats&#46; This reflects the balance between sympathetic and parasympathetic activity&#44; which in turn modulates the way cardiac function responds to differing levels of metabolic activity in the body&#46;<a class="elsevierStyleCrossRef" href="#bib0180"><span class="elsevierStyleSup">15</span></a> CAM can thus be assessed by analyzing HRV&#44; which appears to be reduced in obese children and adolescents&#46;<a class="elsevierStyleCrossRef" href="#bib0185"><span class="elsevierStyleSup">16</span></a></p><p id="par0050" class="elsevierStylePara elsevierViewall">There are associations between the sympathetic nervous system &#40;SNS&#41; and energy balance and metabolic syndrome&#44; and between SNS activity and diet&#46;<a class="elsevierStyleCrossRef" href="#bib0190"><span class="elsevierStyleSup">17</span></a> Sympathetic activation reduces food intake regulated by the hypothalamus and inhibits leptin secretion&#46; Leptin in turn inhibits ectopic lipid accumulation&#44; prevents pancreatic beta cell dysfunction and protects beta cells from apoptosis induced by cytokines and fatty acids&#46; Adiponectin&#44; another adipokine&#44; also promotes fatty acid oxidation and glucose uptake&#46;<a class="elsevierStyleCrossRefs" href="#bib0195"><span class="elsevierStyleSup">18&#44;19</span></a> Together&#44; these effects increase insulin sensitivity and reduce serum lipid levels&#46; In obesity and type 2 diabetes&#44; circulating adiponectin levels fall&#44; and a state of peripheral resistance to hyperleptinemia develops&#59; this appears to play an important role in SNS activation&#46;<a class="elsevierStyleCrossRef" href="#bib0205"><span class="elsevierStyleSup">20</span></a> A study of 32 obese children showed that HRV was reduced through decreased parasympathetic activity and predominance of sympathetic activity&#44; but that these changes were much more marked in children with insulin resistance than in those without&#46;<a class="elsevierStyleCrossRef" href="#bib0210"><span class="elsevierStyleSup">21</span></a> The study by Gulgun et al&#46;<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">3</span></a> also shows parasympathetic impairment in obese pubertal children compared to controls&#44; and aims to establish a relation between this impairment and omega-3 and -6 fatty acid levels in the two groups&#46;</p><p id="par0055" class="elsevierStylePara elsevierViewall">Low HRV is associated with cardiovascular morbidity and mortality&#44; and is therefore a powerful parameter to be assessed and monitored for the early identification of cardiovascular risk in childhood obesity&#46;<a class="elsevierStyleCrossRefs" href="#bib0170"><span class="elsevierStyleSup">13&#44;14</span></a></p><p id="par0060" class="elsevierStylePara elsevierViewall">At the same time&#44; the question remains whether the alterations in CAM associated with obesity precede and contribute to the etiopathogenesis of cardiac autonomic dysfunction&#44; or are merely a consequence of obesity&#46; Which is cause and which is effect&#63;</p><p id="par0065" class="elsevierStylePara elsevierViewall">The article by Gulgun et al&#46;<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">3</span></a> is a contribution to the accumulating evidence on this subject&#44; which points to disruptions in cell metabolism resulting from long-standing dietary imbalances that lead to organ dysfunction and the development of comorbidities&#44; including impairment of cardiac autonomic control&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">The article highlights how important it is for nutritional counseling to focus not only on calorie counts but also on quality and balance in dietary constituents&#44; in view of their value in cardiovascular prevention&#46; Clinical monitoring of obese individuals could include assessment of the erythrocyte membrane lipid profile as a dietary biomarker&#44; as well as HRV analysis as a means for detecting cardiac autonomic dysfunction in obese children&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Conflicts of interest</span><p id="par0075" class="elsevierStylePara elsevierViewall">The author has no conflicts of interest to declare&#46;</p></span></span>"
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        "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Please cite this article as&#58; Ferreira Mansilha H&#46; L&#237;pidos da dieta e disfun&#231;&#227;o auton&#243;mica card&#237;aca na obesidade em idade pedi&#225;trica&#58; qual a associa&#231;&#227;o&#63; Rev Port Cardiol&#46; 2017&#59;36&#58;509&#8211;511&#46;</p>"
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Editorial comment
Fat intake and cardiac autonomic dysfunction in obese children: What is the relationship?
Lípidos da dieta e disfunção autonómica cardíaca na obesidade em idade pediátrica: qual a associação?
Helena Ferreira Mansilhaa,b
a Unidade de Nutrição, Serviço de Pediatria, Departamento da Infância e Adolescência, Centro Materno-Infantil do Norte, Porto, Portugal
b Instituto de Ciências Biomédicas Abel Salazar, Universidade do Porto, Porto, Portugal
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    "titulo" => "Fat intake and cardiac autonomic dysfunction in obese children&#58; What is the relationship&#63;"
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        "autoresLista" => "Helena Ferreira Mansilha"
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        "titulo" => "L&#237;pidos da dieta e disfun&#231;&#227;o auton&#243;mica card&#237;aca na obesidade em idade pedi&#225;trica&#58; qual a associa&#231;&#227;o&#63;"
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    "textoCompleto" => "<span class="elsevierStyleSections"><p id="par0005" class="elsevierStylePara elsevierViewall">Cardiovascular disease in children is becoming ever more common&#44; in parallel with the increasing prevalence of childhood obesity&#46; Tracking of childhood obesity to adulthood increases the risk of developing cardiovascular disease&#44; and by 2035&#44; the number of excess cardiovascular events attributable to adolescent overweight in the USA is expected to exceed 100<span class="elsevierStyleHsp" style=""></span>000 a year&#46;<a class="elsevierStyleCrossRefs" href="#bib0110"><span class="elsevierStyleSup">1&#44;2</span></a> There is thus an urgent need to focus on this problem&#44; in order to prevent cardiovascular disease from affecting children at ever younger ages&#46;</p><p id="par0010" class="elsevierStylePara elsevierViewall">The article by Gulgun et al&#46;<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">3</span></a> in this issue of the <span class="elsevierStyleItalic">Journal</span> on the relationship between the levels of different types of erythrocyte membrane fatty acids and cardiac autonomic dysfunction in pubertal children is thus of considerable interest&#44; especially as it deals with the effects of obesity on the autonomic nervous system rather than with the more commonly discussed impact on premature development and accelerated cardiovascular atherosclerosis&#44;<a class="elsevierStyleCrossRef" href="#bib0125"><span class="elsevierStyleSup">4</span></a> including in childhood&#46;</p><p id="par0015" class="elsevierStylePara elsevierViewall">The authors of this case-control study&#44; which included 48 obese and 32 healthy pubertal children aged 11&#46;95&#177;2&#46;42 and 12&#46;48&#177;2&#46;27 years&#44; respectively&#44; conclude that the differences they found between these groups in levels of omega-6 essential fatty acids may play a role in impairment of autonomic cardiac function in obese children&#46;</p><p id="par0020" class="elsevierStylePara elsevierViewall">It has been known for over twenty years that dietary fat intake can influence the fatty acid composition of cell membranes&#44;<a class="elsevierStyleCrossRef" href="#bib0130"><span class="elsevierStyleSup">5</span></a> changes in which can affect the membranes&#8217; structural characteristics&#44; particularly the function of membrane proteins&#44; and this in turn can have important effects on cell metabolism and other physiological processes&#46;<a class="elsevierStyleCrossRef" href="#bib0135"><span class="elsevierStyleSup">6</span></a> Escriba et al&#46;<a class="elsevierStyleCrossRef" href="#bib0140"><span class="elsevierStyleSup">7</span></a> showed that changes in the lipid composition of cell membranes in hypertensive patients affected signaling proteins involved in control of blood pressure&#46; At the same time&#44; obesity itself causes a highly pro-oxidant metabolic state that can also contribute to structural and functional alterations in the cell membrane through lipid peroxidation&#46;<a class="elsevierStyleCrossRef" href="#bib0145"><span class="elsevierStyleSup">8</span></a></p><p id="par0025" class="elsevierStylePara elsevierViewall">It is generally accepted that measurement of plasma fatty acid levels merely reflects the quality of recent dietary fat intake and is also subject to various other influences from diet&#46; Since the fatty acid composition of the erythrocyte membrane appears to remain constant throughout the life of the cell &#40;around 120 days&#41;&#44; measuring this will give a more consistent result&#44; and thus a better indication of medium- to long-term intake&#46; This was the approach adopted by Gulgun et al&#46;<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">3</span></a></p><p id="par0030" class="elsevierStylePara elsevierViewall">As an illustration of the complexity of this subject&#44; as well as being ingested in food&#44; fatty acids can also be synthesized endogenously&#44; through a process known as de novo lipogenesis&#46; This is an adaptive mechanism in situations of excessive dietary intake of carbohydrate&#44; which is converted into fatty acids and triglycerides&#44; especially in obese individuals&#46; In de novo lipogenesis&#44; endogenous acetyl-CoA is used to produce saturated fatty acids&#44; which are then elongated and&#47;or desaturated to varying degrees&#46;<a class="elsevierStyleCrossRef" href="#bib0150"><span class="elsevierStyleSup">9</span></a></p><p id="par0035" class="elsevierStylePara elsevierViewall">The erythrocyte membrane lipid profile in obese adolescents is characterized by a high cholesterol&#47;phospholipid ratio&#44; increased saturated fatty acid levels and lower levels of mono- and polyunsaturated fatty acids&#44; leading to a significantly reduced unsaturation index&#46;<a class="elsevierStyleCrossRefs" href="#bib0135"><span class="elsevierStyleSup">6&#44;10</span></a> As pointed out above&#44; it is thus logical that such alterations would directly affect flow properties and lipid peroxidation conditions in these membranes&#44; and this has in fact been demonstrated experimentally&#46; Several studies have also shown that low omega-3 fatty acid levels exacerbate the low-level inflammatory state found in adolescent obesity&#44; and that erythrocyte membrane eicosapentaenoic acid levels are inversely correlated with insulin resistance&#46;<a class="elsevierStyleCrossRef" href="#bib0160"><span class="elsevierStyleSup">11</span></a> Various mechanisms have been put forward to explain this association&#44; including competition between glucose and fatty acids as oxidation substrates&#44; inhibition of glucose transport and&#47;or phosphorylation&#44; and release of fatty acids into the portal circulation as a result of lipolytic activity by visceral adipose tissue and release of hormones and cytokines&#44;<a class="elsevierStyleCrossRef" href="#bib0150"><span class="elsevierStyleSup">9</span></a> as also noted by Gulgun et al&#46;&#44; although this was not reflected in their results because their study population did not include insulin-resistant obese subjects&#46;</p><p id="par0040" class="elsevierStylePara elsevierViewall">In recent years&#44; several epidemiological studies have produced evidence of impaired cardiac autonomic modulation &#40;CAM&#41; in obese children&#46; Autonomic activity in humans has a circadian rhythm&#44; with predominantly parasympathetic activity at night and predominantly sympathetic activity during the day&#46;<a class="elsevierStyleCrossRef" href="#bib0165"><span class="elsevierStyleSup">12</span></a> CAM reflects the balance between the sympathetic and parasympathetic systems&#44; but in obese children&#44; reduced parasympathetic activity may be seen compared to normal weight children&#46;<a class="elsevierStyleCrossRef" href="#bib0170"><span class="elsevierStyleSup">13</span></a> However&#44; other studies have shown impairment of CAM not only through reduced parasympathetic activity&#44; but also through absolute or relative sympathetic hyperactivity or preponderance in obese children&#46;<a class="elsevierStyleCrossRef" href="#bib0175"><span class="elsevierStyleSup">14</span></a></p><p id="par0045" class="elsevierStylePara elsevierViewall">The cardiac autonomic nervous system can be assessed non-invasively&#44; simply and reproducibly through analysis of heart rate variability &#40;HRV&#41;&#44; which measures the extent of variation between heartbeats&#46; This reflects the balance between sympathetic and parasympathetic activity&#44; which in turn modulates the way cardiac function responds to differing levels of metabolic activity in the body&#46;<a class="elsevierStyleCrossRef" href="#bib0180"><span class="elsevierStyleSup">15</span></a> CAM can thus be assessed by analyzing HRV&#44; which appears to be reduced in obese children and adolescents&#46;<a class="elsevierStyleCrossRef" href="#bib0185"><span class="elsevierStyleSup">16</span></a></p><p id="par0050" class="elsevierStylePara elsevierViewall">There are associations between the sympathetic nervous system &#40;SNS&#41; and energy balance and metabolic syndrome&#44; and between SNS activity and diet&#46;<a class="elsevierStyleCrossRef" href="#bib0190"><span class="elsevierStyleSup">17</span></a> Sympathetic activation reduces food intake regulated by the hypothalamus and inhibits leptin secretion&#46; Leptin in turn inhibits ectopic lipid accumulation&#44; prevents pancreatic beta cell dysfunction and protects beta cells from apoptosis induced by cytokines and fatty acids&#46; Adiponectin&#44; another adipokine&#44; also promotes fatty acid oxidation and glucose uptake&#46;<a class="elsevierStyleCrossRefs" href="#bib0195"><span class="elsevierStyleSup">18&#44;19</span></a> Together&#44; these effects increase insulin sensitivity and reduce serum lipid levels&#46; In obesity and type 2 diabetes&#44; circulating adiponectin levels fall&#44; and a state of peripheral resistance to hyperleptinemia develops&#59; this appears to play an important role in SNS activation&#46;<a class="elsevierStyleCrossRef" href="#bib0205"><span class="elsevierStyleSup">20</span></a> A study of 32 obese children showed that HRV was reduced through decreased parasympathetic activity and predominance of sympathetic activity&#44; but that these changes were much more marked in children with insulin resistance than in those without&#46;<a class="elsevierStyleCrossRef" href="#bib0210"><span class="elsevierStyleSup">21</span></a> The study by Gulgun et al&#46;<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">3</span></a> also shows parasympathetic impairment in obese pubertal children compared to controls&#44; and aims to establish a relation between this impairment and omega-3 and -6 fatty acid levels in the two groups&#46;</p><p id="par0055" class="elsevierStylePara elsevierViewall">Low HRV is associated with cardiovascular morbidity and mortality&#44; and is therefore a powerful parameter to be assessed and monitored for the early identification of cardiovascular risk in childhood obesity&#46;<a class="elsevierStyleCrossRefs" href="#bib0170"><span class="elsevierStyleSup">13&#44;14</span></a></p><p id="par0060" class="elsevierStylePara elsevierViewall">At the same time&#44; the question remains whether the alterations in CAM associated with obesity precede and contribute to the etiopathogenesis of cardiac autonomic dysfunction&#44; or are merely a consequence of obesity&#46; Which is cause and which is effect&#63;</p><p id="par0065" class="elsevierStylePara elsevierViewall">The article by Gulgun et al&#46;<a class="elsevierStyleCrossRef" href="#bib0120"><span class="elsevierStyleSup">3</span></a> is a contribution to the accumulating evidence on this subject&#44; which points to disruptions in cell metabolism resulting from long-standing dietary imbalances that lead to organ dysfunction and the development of comorbidities&#44; including impairment of cardiac autonomic control&#46;</p><p id="par0070" class="elsevierStylePara elsevierViewall">The article highlights how important it is for nutritional counseling to focus not only on calorie counts but also on quality and balance in dietary constituents&#44; in view of their value in cardiovascular prevention&#46; Clinical monitoring of obese individuals could include assessment of the erythrocyte membrane lipid profile as a dietary biomarker&#44; as well as HRV analysis as a means for detecting cardiac autonomic dysfunction in obese children&#46;</p><span id="sec0005" class="elsevierStyleSection elsevierViewall"><span class="elsevierStyleSectionTitle" id="sect0005">Conflicts of interest</span><p id="par0075" class="elsevierStylePara elsevierViewall">The author has no conflicts of interest to declare&#46;</p></span></span>"
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        "nota" => "<p class="elsevierStyleNotepara" id="npar0005">Please cite this article as&#58; Ferreira Mansilha H&#46; L&#237;pidos da dieta e disfun&#231;&#227;o auton&#243;mica card&#237;aca na obesidade em idade pedi&#225;trica&#58; qual a associa&#231;&#227;o&#63; Rev Port Cardiol&#46; 2017&#59;36&#58;509&#8211;511&#46;</p>"
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Revista Portuguesa de Cardiologia (English edition)
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