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Université de Fribourg

Weight cycling during growth and beyond as a risk factor for later cardiovascular diseases: the 'repeated overshoot' theory

Montani, Jean-Pierre ; Viecelli, A. K. ; Prévot, Anne ; Dulloo, Abdul G.

In: International Journal of Obesity, 2006, vol. 30, no. S4, p. S58–S66

In people trying to lose weight, there are often repeated cycles of weight loss and regain. Weight cycling is, however, not limited to obese adults but affects people of normal weight, particularly young women, who are unhappy with their appearance. Furthermore, the onset of a pattern of weight cycling is shifting towards younger ages, owing to the increasing prevalence of overweight and obesity...

Université de Fribourg

Water-induced thermogenesis reconsidered: the effects of osmolality and water temperature on energy expenditure after drinking

Brown, Clive M. ; Dulloo, Abdul G. ; Montani, Jean-Pierre

In: Journal of Clinical Endocrinology and Metabolism, 2006, vol. 91, no. 9, p. 3598-3602

Context: A recent study reported that drinking 500 ml of water causes a 30% increase in metabolic rate. If verified, this previously unrecognized thermogenic property of water would have important implications for weight-loss programs. However, the concept of a thermogenic effect of water is controversial because other studies have found that water drinking does not increase energy...

Université de Fribourg

Uninephrectomy in rats on a fixed food intake potentiates both anorexia and circulating cytokine subsets in response to LPS

Arsenijevic, Denis ; Montani, Jean-Pierre

In: Frontiers in Immunology - Inflammation, 2015, p. 641

Recent human studies have suggested that mild reduction in kidney function can alter immune response and increase susceptibility to infection. The role of mild reduction in kidney function in altering susceptibility to bacterial lipopolysaccharide (LPS) responses was investigated in uninephrectomized rats compared to Sham-operated controls rats 4 weeks after surgery. Throughout the 4 weeks, all...

Université de Fribourg

Uninephrectomy-induced lipolysis and low-grade inflammation are mimicked by unilateral renal denervation

Arsenijevic, Denis ; Cajot, Jean-François ; Fellay, Benoit ; Dulloo, Abdul G. ; Vliet, Bruce N. Van ; Montani, Jean-Pierre

In: Integrative Physiology, 2016, p. 227

Uninephrectomy (UniNX) in rats on a fixed food intake leads to increased lipolysis and a low-grade inflammation with an increased subset of circulating cytokines. Because UniNX ablates renal nerves on the side of the removed kidney, we tested the contribution of unilateral renal denervation in the phenotype of UniNX. We compared Sham-operated controls, left nephrectomy (UniNX) and unilateral...

Université de Fribourg

Understanding the contribution of Guyton's large circulatory model to long-term control of arterial pressure

Montani, Jean-Pierre ; Vliet, Bruce N. Van

In: Experimental Physiology, 2009, vol. 94, no. 4, p. 382-388

With the publication in 1972 of a large computer model of circulatory control, Guyton and colleagues challenged the then prevailing views on how blood pressure and cardiac output were controlled. At that time, it was widely accepted that the heart controlled cardiac output and that peripheral resistance controlled arterial blood pressure. By incorporating the empirically demonstrated concepts of...

Université de Fribourg

Time course of cardiovascular responses induced by mental and orthostatic challenges

Lackner, Helmut Karl ; Goswami, Nandu ; Papousek, Ilona ; Roessler, Andreas ; Grasser, Erik Konrad ; Montani, Jean-Pierre ; Jezova, Daniela ; Hinghofer-Szalkay, Helmut

In: International Journal of Psychophysiology, 2010, vol. 75, no. 1, p. 48-53

Cardiovascular responses to single stressors diminish over time. Interaction of different stressors influencing hemodynamic variables, indicative of stress-induced reactivity and physiological responses are, however, poorly understood. We investigated time course of mental (using mental arithmetic, MA) and orthostatic (using head up tilt, HUT) challenges induced responses in 16 males. Three...

Université de Fribourg

Thrombin Stimulates Human Endothelial Arginase Enzymatic Activity via RhoA/ROCK Pathway

Ming, Xiu-Fen ; Barandier, Christine ; Viswambharan, Hema ; Kwak, Brenda R. ; Mach, François ; Mazzolai, Lucia ; Hayoz, Daniel ; Ruffieux, Jean ; Rusconi, Sandro ; Montani, Jean-Pierre ; Yang, Zhihong

In: Circulation, 2004, vol. 110, p. 3708-3714

Background— Arginase competes with endothelial nitric oxide synthase (eNOS) for the substrate L-arginine and decreases NO production. This study investigated regulatory mechanisms of arginase activity in endothelial cells and its role in atherosclerosis. Methods and Results— In human endothelial cells isolated from umbilical veins, thrombin concentration- and time-dependently stimulated...

Université de Fribourg

Thrifty metabolism that favors fat storage after caloric restriction: a role for skeletal muscle phosphatidylinositol-3-kinase activity and AMP-activated protein kinase

Summermatter, Serge ; Mainieri, Davide ; Russell, A. P. ; Seydoux, Josiane ; Montani, Jean-Pierre ; Buchala, Anthony J. ; Solinas, Giovanni ; Dulloo, Abdul G.

In: Faseb Journal, 2008, vol. 22, p. 774-785

Energy conservation directed at accelerating body fat recovery (or catch-up fat) contributes to obesity relapse after slimming and to excess fat gain during catch-up growth after malnutrition. To investigate the mechanisms underlying such thrifty metabolism for catch-up fat, we tested whether during refeeding after caloric restriction rats exhibiting catch-up fat driven by suppressed...

Université de Fribourg

The thrifty 'catch-up fat' phenotype: its impact on insulin sensitivity during growth trajectories to obesity and metabolic syndrome

Dulloo, Abdul G. ; Jacquet, Jean ; Seydoux, Josiane ; Montani, Jean-Pierre

In: International Journal of Obesity, 2006, vol. 30, no. S4, p. S23–S35

The analyses of large epidemiological databases have suggested that infants and children who show catch-up growth, or adiposity rebound at a younger age, are predisposed to the development of obesity, type 2 diabetes and cardiovascular diseases later in life. The pathophysiological mechanisms by which these growth trajectories confer increased risks for these diseases are obscure, but there is...

Université de Fribourg

The thermic effect of sugar-free Red Bull: Do the non-caffeine bioactive ingredients in energy drinks play a role?

Miles-Chan, Jennifer L. ; Charrière, Nathalie ; Grasser, Erik K ; Montani, Jean-Pierre ; Dulloo, Abdul G.

In: Obesity, 2015, vol. 23, no. 1, p. 16–19

Objective: Consumption of energy drinks is increasing amongst athletes and the general public. By virtue of their bioactive ingredients (including caffeine, taurine, glucuronolactone, and B-group vitamins) and paucity of calories, sugar-free “diet” versions of these drinks could be a useful aid for weight maintenance. Yet little is known about the acute influence of these drinks, and...