Biomedical subjects

J Duchene

Publications and source records attributed to J Duchene.

11 recordsLinked to original sources

PubMed1996

Socio-economic differences in mortality. A life course approach.

"Differential mortality in Norway has been studied on the basis of a sample of data derived from the linkage of the 1960, 1970, and 1980 censuses to vital registration records. Based on the hypothesis that the determinants of survival act in interaction, two models are proposed. The first is based on states defined at each observation period by the conjunction of attributes characterizing each individual. The second model considers the chronological order of the states. Logistic regression applied to the latter shows that the most favourable male and female life trajectories are those for married people belonging to rather privileged categories. There are however some differences by sex, as favourable trajectories concern both economically inactive females and employees." (SUMMARY IN FRE)

Data Collection↗

PubMed1993

Surface electromyogram power spectrum in human quadriceps muscle during incremental exercise.

Spectral electromyographic (EMG) changes in human quadriceps muscles were studied to reinvestigate discrepant results concerning mean power frequency (MPF) changes during dynamic exercise. An incremental test consisting of a quasi-linear increase in mechanical power on a bicycle ergometer (for 20-100% of maximal aerobic power) was performed by forty subjects. During this test, surface EMGs from the quadriceps muscles showed that EMG total power (PEMG) increased with a curvilinear pattern for every subject, whereas MPF kinetics varied from one subject to another. PEMG changes had the same shape, which would lead to disappointing results in terms of discrimination between subjects. The ability of normalized MPF kinetics to define significant clusters of subjects was tested using a principal component analysis. This analysis led to the projection of all experiments onto a plane and revealed a relevant grouping of MPF profiles. Differences in MPF kinetics between clusters are interpreted in terms of various possibilities of balance between physiological events leading to an increase or a decrease in MPF.

Adult↗

PubMed1992

Duchenne muscular dystrophy quantification: a multivariate analysis of surface EMG.

The paper describes a method of quantifying Duchenne muscular dystrophy which is examiner independent and uses surface electromyographic signals (EMG). A standardised protocol is proposed. Spectral parameters are first computed from digitised EMG, then a polynomial model is deduced from the evolution of each parameter. A discriminant analysis between healthy and DMD subjects leads to the determination of a discriminant plane and a level of sickness index.

Adult↗

PubMed1989

A pseudoperiodic model for myoelectric signal during dynamic exercise.

A theoretical model of dynamic surface myoelectric signal (SMES) suitable for periodic exercise has been developed. It has been shown that the spectral content of SMES in the very low-frequency band can be related to burst patterns of SMES. Burst patterns were compared during cycling exercises at different pedaling rates. A simple spectral parameter, defined in the very low-frequency band, was related to movement efficiency.

Electromyography↗

PubMed1989