Onset of exercise and diet program in obese women: metabolic and anorexigenic responses related to weight loss and physical capacities.

Perturbations of energy balance induce compensatory processes that may alter expected weight loss. In obese patients, our aim was to investigate the relationships that occurred between fasting plasma concentrations of anorexigenic peptides and metabolic parameters, appetite, physical capacity, and weight loss in the 5 first days of a program associating exercise and caloric reduction. Thirteen obese women were monitored from day 1 to day 5 with 2 exercise sessions in day 2 and day 4. We measured, in a fasted state, changes in body weight, hunger ratings, and plasma concentrations of fatty acids, triglycerides, leptin, insulin, amylin, peptide YY, and insulin-resistance index. Physical performance was assessed by a 6-min walking test. The program resulted in significantly reduced body weight (0.75±0.4 kg; p=0.001), of plasma concentrations of triglycerides, insulin, amylin, peptide YY, and the insulin-resistance index, and also increased fatty acids (p<0.05). Hunger ratings were increased (p<0.05). Program-induced changes in fatty acids, leptin, and insulin concentrations were related to physical performance (r(2)=0.45, 0.59, and 0.52; p<0.05, respectively) and to weight loss (r(2)=0.65, 0.57, 0.55; p<0.05, respectively). Five days of diet and exercise induced weight loss, improved lipid profile, and decreased insulin resistance while hunger ratings increased. Subjects with higher physical capacity lost more weight, presented higher increases in fatty acids and lower changes of leptin and insulin concentrations suggesting a better metabolic flexibility. To reduce the compensatory responses that can occur with energy imbalances, our study supports to account for individual activity level before prescribing weight-loss program associating diet and exercise.

Adapted educational health program among deprived subjects with prediabetes.

AIMS: Assess the feasibility and benefit of a health educational program on global metabolic status in prediabetic deprived subjects. DESIGN: Case control study. METHODS: 693 subjects (466 men, 227 women), aged 16 to 95 years with prediabetes and low socioeconomic status, consulting at the IPC Center were included between September 2015 and June 2016. Subjects were invited to participate in 4 workshops (2 nutrition, 2 physical activities). One year after their inclusion (visit 1), they were offered a second health check-up (visit 2). Participants were classified into 3 groups: 1) Intervention group (INTG, N=133): complete process 2) Control group (CG, N=415): Only a second health check-up, no workshop participation; 3) Abandoned group (AG, N=145). All groups were compared. RESULTS: After considered confounding factors, fasting blood glucose and SBP levels variation between visit 1 and visit 2 differed significantly between the CG and INTG. In the INTG with higher diminution of fasting glucose, 90% reported eating healthy food since nutrition workshop and 51%. reached objectives (The same trend was observed for physical activity. CONCLUSION: An educational program among deprived prediabetic tended to limit fasting glucose increment, improve metabolic status and encourage healthy lifestyle despite difficulties in convincing subjects to participate.

Interspersed repeats in the horse (Equus caballus); spatial correlations highlight conserved chromosomal domains.

The interspersed repeat content of mammalian genomes has been best characterized in human, mouse and cow. In this study, we carried out de novo identification of repeated elements in the equine genome and identified previously unknown elements present at low copy number. The equine genome contains typical eutherian mammal repeats, but also has a significant number of hybrid repeats in addition to clade-specific Long Interspersed Nuclear Elements (LINE). Equus caballus clade specific LINE 1 (L1) repeats can be classified into approximately five subfamilies, three of which have undergone significant expansion. There are 1115 full-length copies of these equine L1, but of the 103 presumptive active copies, 93 fall within a single subfamily, indicating a rapid recent expansion of this subfamily. We also analysed both interspersed and simple sequence repeats (SSR) genome-wide, finding that some repeat classes are spatially correlated with each other as well as with G+C content and gene density. Based on these spatial correlations, we have confirmed that recently-described ancestral vs. clade-specific genome territories can be defined by their repeat content. The clade-specific Short Interspersed Nuclear Element correlations were scattered over the genome and appear to have been extensively remodelled. In contrast, territories enriched for ancestral repeats tended to be contiguous domains. To determine if the latter territories were evolutionarily conserved, we compared these results with a similar analysis of the human genome, and observed similar ancestral repeat enriched domains. These results indicate that ancestral, evolutionarily conserved mammalian genome territories can be identified on the basis of repeat content alone. Interspersed repeats of different ages appear to be analogous to geologic strata, allowing identification of ancient vs. newly remodelled regions of mammalian genomes.

[Primary brain stem hemorrhage: retrospective study of 25 cases]. / Hémorragies spontanées du tronc cérébral: étude rétrospective de 25 observations.

INTRODUCTION: We report a retrospective series of 25 cases of brain stem hemorrhage. METHODS: Cases of spontaneous hemorrhage of the brain stem which were observed from 1990 to 2000 in a department of neurology were reviewed. Etiological factors, CT scan at admission, clinical signs and the course of the disease were analyzed retrospectively. RESULTS: There were 25 patients, 14 male and 11 female aged from 24 to 91. Fifteen hematomas were related to hypertension, four to coagulation disorders and two to a vascular malformation. The hemorrhage was located in the pons in 22 cases and in the midbrain in three cases. The death rate directly related to the hemorrhage was 14/25 (12 early and two delayed deaths). Prognosis factors were the size of the hemorrhage, a ventricular bleeding, disorders of consciousness and pupillary abnormalities on admission, the need for mechanical ventilation. CONCLUSION: In brain stem hemorrhage, the size of the hematoma is a more important prognosis factor than age or etiological factors.

Membrane function in mammalian hibernation.

For homeotherms the maintenance of a high, uniform body temperature requires a constant energy supply and food intake. For many small mammals, the loss of heat in winter exceeds energy supply, particularly when food is scarce. To survive, some animals have developed a capacity for adaptive hypothermia in which they lower their body temperature to a new regulatory set-point, usually a few degrees above the ambient. This process, generally known as hibernation, reduces the temperature differential, metabolic activity, as well as the energy demand, and thus facilitates survival during winter. Successful hibernation in mammals requires that the enzymatic processes are regulated in such a manner that metabolic balance is maintained at both the high body temperature of the summer-active animal (37 degrees C) and the low body temperature of the winter-torpid animal (approx. 5 degrees C). This means that the cellular membranes have thermal properties capable of maintaining a balanced metabolism at these extreme physiological temperatures. The available evidence indicates that, for some tissues, preparation for hibernation involves an alteration in the lipid composition and thermal properties of cellular membranes. Marked differences in the thermal response of cellular membranes have been observed on a seasonal basis and, in some membranes, differences in lipid composition have been associated with the torpid state. However, to date, no consistent changes in lipid composition which would account for, or explain, the changes in membrane thermal response, have been detected. An important point to emphasize is that the process of 'homeoviscous adaptation', which occurs in procaryotes and some poikilotherms during acclimation to low temperatures, is not a characteristic feature of most membranes of mammalian hibernators.

Membrane lipid fluidity and its effect on the activation energy of membrane-associated enzymes.

1. The fatty acid composition of mitochondrial membranes from sheep and rats was altered by feeding these animals diets which were rich in unsaturated fatty acids. Changes in membrane lipid fluidity resulting from the altered membrane lipid composition were assessed by determining the upper temperature limit of the disorder-order transition (Tf) and the Arrhenius activation energy (Ea) of succinate oxidase. 2. After feeding the unsaturated fatty acid-rich diet to sheep the Ea, in the temperature range above Tf, increased from 8 to 63 kJ . mol-1 while Tf decreased from 32 to 15 degrees C. Rats fed an unsaturated fatty acid-rich diet exhibited an increase in Ea from 17 to 63 kJ . mol-1 and a decrease in Tf from 23 to 4 degrees C. 3. This decrease in Tf was related to an increase in the ratio of linoleic acid to stearic acid in the membrane lipid. Tf was not related to the proportion of unsaturated fatty acids in the membrane lipids, although an increase in unsaturation usually led to a decrease in Tf. 4. The results show that membrane lipid fluidity has a direct influence on the conformation of the active site of some membrane-associated enzymes, with the result that such enzymes display a higher Ea when the membrane lipids are comparatively more fluid. The increase in Ea of membrane-associated enzymes which accompanies changes in the physical state of membrane suggests that some proteins may phase separate with the more fluid lipids at low temperatures.

The fluidity of chloroplast thylakoid membranes and their constituent lipids: a comparative study by ESR.

Comparative measurements were made of the fluidity of chloroplast thylakoids, total membrane lipids and polar lipids utilizing the order parameter and motion of spin labels. No significant differences were found in the fluidity of membranes or total membrane lipids from a wild type and a mutant barley (Hordeum vulgare chlorina f2 mutant) which lacks chlorophyll b and a 25 000 dalton thylakoid polypeptide. Redistribution of intrinsic, exoplasmic face (EF) membrane particles by unstacking thylakoid membranes in low salt medium also had no effect on membrane fluidity. However, heating of isolated thylakoids decreased membrane fluidity. The fluidity of vesicles composed of membrane lipids is much greater than that of the corresponding membranes. Fluidity of the membranes, however, increased during greening indicating that the rigidity of the membranes, compared with that of total membrane lipids, is not caused by chlorophyll or its associated peptides. It is concluded that the restriction of motion in the acyl chains in the thylakoids is not caused by chlorophyll or the major intrinsic polypeptide but by some other protein components.

Biological membranes are rich in low-frequency motion.

Using 13C cross-polarization NMR techniques, we have found that the effect of protein on the dynamics of the hydrocarbon interior of a series of biological membranes is to depress the intensity of motion on the nanosecond timescale (i.e., T1 becomes longer) and to enhance the intensity of motion on the timescale of tens of microseconds (i.e., T1p becomes shorter.)

Adipose tissue cellularity and hemodynamic indexes in obese patients with hypertension.

Fat-cell weight, fat-cell number, and hemodynamic indexes were determined in 25 obese men with sustained elevation of BP. Fat-cell weight (and not fat-cell number) was positively correlated with overweight (r = .51) and mean arterial pressure (MAP) (r = .57) in basal conditions. After body weight reduction, BP decreased significantly through a decrease in cardiac index due to a predominant decrease in heart rate. Simultaneously, fat-cell weight decreased significantly. The ratio between the change in BP and the change in body weight, ie, the ability to decrease pressure per unit weight loss, was positively related to the level of initial BP (r = .80) and reached a plateau above 120 mm Hg of the initial MAP. We suggest that, in patients with obesity and hypertension, high BP is associated with hypertrophic obesity, and after body weight reduction, the simultaneous decrease in BP, heart rate, and fat-cell weight could be mediated by neurogenic mechanisms.

Radiation-induced lipid peroxidation and the fluidity of erythrocyte membrane lipids.

The effect of radiation-induced peroxidation on the fluidity of the phospholipids of the erythrocyte membrane was studied using both erythrocyte ghosts and liposomes formed from the polar lipids of erythrocytes. In liposomes, the oxidation of the phospholipids increased with radiation dose, but there was no change in the fluidity of the lipids as measured by spin-label motion. Under the same conditions of irradiation, no oxidation of phospholipid was detected in erythrocyte ghosts, although changes occurred in the motion of spin labels intercalated with the membrane. These changes were attributed to radiation-induced alterations in the membrane proteins. It is concluded that alterations in motion of spin labels, observed with intact membranes after irradiation, are most likely the result of changes in the structure of membrane proteins rather than the lipids.

Relationships between 3-y longitudinal changes in body mass index, waist-to-hip ratio, and metabolic variables in an active French female population.

Three-year longitudinal changes in body mass index (BMI), waist-to-hip ratio (WHR), and metabolic variables were examined in 209 active French women. For the entire group, a weak but significant positive association was found between change in BMI and change in WHR. However, analysis of covariance according to the degree of abdominal fat distribution showed a heterogeneity of this association that was confined to women with abdominal fat distribution. Changes in BMI were positively associated with changes in total cholesterol (P less than 0.05), triglycerides (P less than 0.10), and blood pressure (P less than 0.001), whereas changes in WHR were associated with changes in triglycerides (P less than 0.05) and diastolic blood pressure (P less than 0.10). These longitudinal results suggest that a more favorable body-fat pattern and metabolic profile might be achieved by reducing weight, or at least by preventing weight gain, particularly in women with high abdominal-fat distribution.

How the degree of unsaturation of dietary fatty acids influences the glucose and insulin responses to different carbohydrates in mixed meals.

The association of fats with carbohydrates results in a lower glucose response but the influence of the nature of the dietary fatty acids has not been investigated clearly. We examined the effect of the degree of dietary fatty acid unsaturation on the postprandial glucose and insulin responses to a mixed meal. Eight young normolipidemic men consumed four different meals in random order. The meals differed in the nature of their oils and in the type of their main carbohydrates. The meals contained either a high ratio of monounsaturated to polyunsaturated n-6 fatty acids (MUFA) or a low ratio (PUFA) and either potatoes or parboiled rice. Proteins and saturated and polyunsaturated n-3 fatty acid contents were not different among meals. Blood samples were collected every 30 min for 3 h after the test meal. The glucose response was significantly lower 30 min after the parboiled rice-PUFA meal than after parboiled rice-MUFA or potato-MUFA (P < 0.05) meals. The insulin response was lower after parboiled rice-PUFA than after potato-MUFA (P < 0.05) meals. Similarly, an effect of fat appeared after 30 min. Glucose responses (F = 1.4, P < 0.01) and insulin responses (F = 5.3, P < 0.05) to both carbohydrates were significantly lower with dietary PUFA compared with dietary MUFA. In conclusion, the degree of dietary fatty acid unsaturation (18:1 compared with 18:2) may influence the glucose and insulin responses to mixed meals.

Hormonal influences on the relationships between body fatness, body fat distribution, lipids, lipoproteins, glucose and blood pressure in French working women.

The independent associations between overall obesity, body fat distribution, lipids, lipoproteins, glucose, blood pressure and some hormonal factors (sex hormone-binding globulin (SHBG), corticosteroid binding globulin (CBG) and fasting insulin) were cross-sectionally examined in 205 French working women. After adjustment for age, overall adiposity assessed by body mass index (BMI) was significantly associated with most metabolic parameters, whereas regional adiposity assessed by the waist-hip ratio (WHR) was significantly associated only with triglyceride, systolic and diastolic blood pressure. Blood pressure, glucose but not triglyceride, were also negatively and significantly correlated with SHBG and positively with fasting insulin. Negative independent associations were found between SHBG and both BMI and WHR, whereas CBG was positively associated only with WHR. Fasting insulin was no longer related to WHR after adjustment for BMI. After controlling for the effect of SHBG or insulin, the associations between triglyceride, blood pressure and both BMI and WHR were not substantially modified. After adjustment for BMI and WHR, fasting insulin was independently associated with both HDL cholesterol and diastolic blood pressure. In conclusion, in these French women, hormonal factors under study appeared to have little influence on the relationships between body fatness, body fat distribution, metabolic variables and blood pressure.

Forearm haemodynamics in obese normotensive and hypertensive subjects.

Forearm haemodynamics using pulsed Doppler flowmetry were studied in 83 men: 15 non-obese and eight obese normotensive subjects; 30 non-obese and 30 obese hypertensive patients. Mean ages were similar in the four subgroups. The blood pressure of normotensives and hypertensives was identical in obese and non-obese subjects. Blood flow, expressed in ml/min, was significantly higher in obese subjects, whether normotensive or hypertensive. However, when blood flow was expressed per unit litre of forearm volume, it was similar in the four subgroups. Forearm vascular resistance, whether expressed as absolute or normalized values, was significantly higher (P less than 0.001) in non-obese hypertensives. When obese and non-obese hypertensives were compared, the former were characterized by higher values of blood flow velocity and blood flow, and lower values of vascular resistance, whether absolute or normalized values were used. This study shows firstly that forearm vascular resistance in hypertensives is increased exclusively in non-obese subjects, and secondly that obese hypertensives, when compared with non-obese hypertensives, are characterized by a hyperkinetic forearm circulation.

Extracellular and interstitial fluid volume in obesity with and without associated systemic hypertension.

Fluid volumes and cardiac and renal hemodynamics were investigated in 44 obese men, 22 with normal blood pressure and 22 with sustained essential hypertension. For the same degree of obesity hypertensive patients had a higher value in extracellular (p less than 0.05) and interstitial fluid (p less than 0.01) volumes than normotensive subjects, while plasma volume, total body water, body cellular water, cardiac output, renal blood flow and glomerular filtration rate were similar. For the same level of blood pressure, the expansion of extracellular and interstitial fluid volume paralleled the degree of obesity. Thus, obese patients with hypertension have an absolute increase in extracellular and interstitial fluid volumes. The increase was related both to the degree of overweight and to the mechanisms of hypertension.

Intravascular volume, extracellular fluid volume, and total body water in obese and nonobese hypertensive patients.

Intraarterial blood pressure, plasma volume, extracellular and interstitial (IFV) fluid volumes, and total and intracellular (IBV) body water were evaluated in 50 men: 16 obese hypertensive patients, 16 nonobese hypertensive patients, and 18 normal subjects of similar age. In obese hypertensive subjects, the IBW/IFV ratio was significantly increased (p less than 0.01) in comparison with both control subjects and nonobese hypertensive patients. After body weight reduction, blood pressure (p less than 0.01), heart rate (p less than 0.05), and the IBW/IFV ratio (p less than 0.01) significantly decreased. The decrease in the ratio was due to an absolute increase in the interstitial fluid volume, related to a shift of fluid volume from the intracellular to the interstitial space. Thus, obese hypertensive patients have an increased water cell content, causing an altered partition between the intracellular and the interstitial spaces.

Skinfold and body circumferences as measures of body fat patterning in a French female active population: relationships with the metabolic risk profile.

Body mass index (BMI), various anthropometric indices of abdominal fat distribution and some metabolic variables (blood lipids, fasting glucose, blood pressure) were measured in 408 French-born women from an occupational population who volunteered for the study. The aim of the study was to determine the best index for describing the relationships between the body fat pattern and the metabolic risk profile. The four age-adjusted circumference ratios (waist/hip, waist/thigh, xiphoid/hip, xiphoid/thigh) showed similar associations with the metabolic variables whereas the three age-adjusted skinfold ratios (epigastric/thigh, mesogastric/thigh, hypogastric/thigh) tended to be more weakly associated with the metabolic variables, particularly with apolipoprotein (Apo) B and fasting glucose. Multiple regression analyses showed that age-adjusted BMI was significantly related to high density lipoprotein (HDL) cholesterol, low density lipoprotein (LDL) cholesterol, Apo A and Apo B, and blood pressure, independently of abdominal fat distribution. After controlling for the effects of BMI, the waist/thigh ratio remained significantly associated to triglyceride, Apo B, fasting glucose, and systolic blood pressure, whereas the waist/hip ratio and the mesogastric/thigh skinfold ratio were significantly related only to triglyceride and systolic blood pressure independently of BMI. With the exception of triglyceride and fasting glucose, the degree of association between the metabolic variables and the abdominal fat distribution tended to be weaker than that observed with the BMI. These results emphasize the importance of the global corpulence in the levels of metabolic variables. However, all indices of abdominal fat distribution were, to varying degrees, independently associated with an unfavorable metabolic profile. Among them, the waist/thigh circumference ratio seems to be a useful indicator of the body fat pattern in women.

Influence of sex and body weight on forearm hemodynamics in patients with sustained essential hypertension.

Forearm hemodynamics using pulsed Doppler flowmeter measurements were studied in 60 hemodynamics men (30 nonobese and 30 obese) and in 45 hypertensive women (15 nonobese and 30 obese subjects). Age and blood pressure of nonobese and obese patients were identical in men as well as in women. Blood flow, expressed in milliliters/minute or corrected for body surface area, was significantly higher in obese hypertensive patients. When blood flow was expressed per unit liter of forearm volume, the difference was no longer present. The increased blood flow in milliliters/minute in obese hypertensive patients was due to an increased blood velocity, while arterial diameter was similar in nonobese and obese hypertensive patients. Forearm vascular resistance, expressed either in absolute values or in normalized values was significantly higher in nonobese than in obese hypertensive patients. When men and women with similar body weight and mean arterial pressure were compared, women were characterized by lower values of arterial diameter, body surface area and forearm volume, whereas vascular resistance in absolute value or corrected for body surface area was higher. This increase was no longer present when vascular resistance was normalized for forearm volume. This study provides evidence that body composition and body mass index evolve as determinants of arterial blood velocity whereas the gender of the patient seems to influence the arterial diameter.

Effects of atorvastatin on aortic pulse wave velocity in patients with hypertension and hypercholesterolaemia: a preliminary study.

As statins may contribute to plaque stabilisation, it is important to evaluate whether these drugs may modify arterial stiffness. In 23 patients, aged 32-70 years, with hypertension and hypercholesterolaemia, a double-blind randomised study vs placebo was performed to evaluate whether atorvastatin was able to modify aortic stiffness, measured from aortic pulse wave velocity (PWV), after a 12-week treatment. The results revealed that atorvastatin did not change blood pressure, significantly lowered (P<0.003; <0.002) plasma total and LDL cholesterol, and increased aortic PWV by +8% (vs -2% under placebo) (P

Plasma insulin, plasminogen activator inhibitor, and ankle-brachial systolic blood pressure ratio in overweight hypertensive subjects.

BACKGROUND: In hypertensive subjects, the ratio between ankle and brachial systolic blood pressure (ABI) has been shown to be an independent risk factor for cardiovascular diseases, particularly in the elderly. Plasma insulin may be an important interconnecting factor explaining this observation. PURPOSE: In a population of middle-aged subjects with essential hypertension and moderate overweight, we identified whether the decrease in the ABI ratio was associated with the clinical and biochemical factors involved in resistance to insulin. Patients with diabetes and/or arteriosclerosis obliterans of the lower limbs were excluded from the population. Subjects were or were not on antihypertensive therapy. RESULT: On the basis of univariate correlations, the ABI ratio was found to be significantly and negatively associated not only with the degree of abdominal fat distribution, but also with the usual biological features of resistance to insulin: plasma triglycerides and cholesterol; plasma glucose and insulin; and plasminogen activator inhibitor (PAI) antigen. In a multivariate analysis in subjects with untreated hypertension, the ABI ratio was significantly and negatively associated with only three variables: age, plasma insulin and PAI antigen. In treated hypertensive subjects, only the role of age and insulin remained significant. CONCLUSION: Since the alterations of the ABI ratio may be considered as a marker of the changes in the structure and function of arteries of the lower limbs, the study provides evidence that plasma insulin and PAI antigen, independently of the presence of significant atherosclerotic occlusive lesions, are susceptible to alter the pressure wave transmission in conduit arteries of the lower limbs.