Gender differences in whole-body fat oxidation kinetics during exercise.

Discrepancies appear in studies comparing fat oxidation between men and women. Therefore, this study aimed to quantitatively describe and compare whole-body fat oxidation kinetics between genders during exercise, using a sinusoidal (SIN) model. Twelve men and 11 women matched for age, body mass index, and aerobic fitness (maximal oxygen uptake and maximal power output per kilogram of fat-free mass (FFM)) performed submaximal incremental tests (Incr) with 5-min stages and a 7.5% maximal power output increment on a cycle ergometer. Fat oxidation rates were determined using indirect calorimetry, and plotted as a function of exercise intensity. The SIN model, which includes 3 independent variables (dilatation, symmetry, translation) that account for the main quantitative characteristics of kinetics, was used to mathematically describe fat oxidation kinetics and to determine the intensity (Fatmax) eliciting the maximal fat oxidation (MFO). During Incr, women exhibited greater fat oxidation rates from 35% to 85% maximal oxygen uptake, MFO (6.6 ± 0.9 vs. 4.5 ± 0.3 mg·kg FFM-1·min-1), and Fatmax (58.1% ± 1.9% vs. 50.0% ± 2.7% maximal oxygen uptake) than men (p < 0.05). While men and women showed similar global shapes of fat oxidation kinetics in terms of dilatation and symmetry (p > 0.05), the fat oxidation curve tended to be shifted toward higher exercise intensities in women (rightward translation, p = 0.08). These results support the idea that women have a greater reliance on fat oxidation than men during submaximal exercise, but also indicate that this greater fat oxidation is shifted toward higher exercise intensities in women than in men.

Activité et émotions. Perspective développementale des émotions comme instruments psychologiques.

L'auteur propose une analyse des travaux de Wallon sur la fonction première des émotions et de ceux de Vygotski sur les instruments psychologiques pour montrer que les émotions peuvent être considérées comme instruments psychologiques. Celles-ci, en cours de développement s'intègrent aux autres fonctions et deviennent ainsi un système expressif, corporel, culturellement marqué, qui accompagne toutes les formes de communication. Ce système expressif constitue une forme d'intelligence spatiale et des situations. Intelligence dont l'expression peut être entravée par différents mécanismes, internes ou externes au sujet. L'exemple des effets des différentes formes d'organisation de travail est ainsi discuté.

Gender identity in urban poor mobilizations: evidence from Bengaluru

This paper draws on field research conducted among a group of resettled slum(1) dwellers in the west of Bengaluru, and analyzes women's collective engagement to improve the provision of urban services in low-income neighbourhoods. The paper argues the need to deepen the focus on urban poor mobilizations below the level of the urban poor as a group - to look at the various groups, and the differences, divergences and contradictions within. Using gender as a differential, the paper focuses on women who dominate local neighbourhood level initiatives within low-income settlements, and analyzes their specific opportunities and constraints as actors within the larger domain of urban poor mobilizations. It proposes that these seemingly insignificant day-to-day negotiations diverge from more individual forms of "leadership", creating a political space at the lowest level of the neighbourhood where the projects of material improvement and emancipation take place simultaneously.