Library

feed icon rss

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • Oestrogen  (1)
  • Polymer and Materials Science  (1)
  • Women  (1)
  • 1
    Electronic Resource
    Electronic Resource
    Springer
    International orthopaedics 7 (1984), S. 209-214 
    ISSN: 1432-5195
    Keywords: Bone mineral content ; Exercise ; Women ; Osteoporosis ; Oestrogen
    Source: Springer Online Journal Archives 1860-2000
    Topics: Medicine
    Description / Table of Contents: Résumé Les auteurs ont comparé, par photo-absorptiométrie de l'extrémité inférieure du radius, les effets de la marche et de la danse «aerobic« sur l'os de 73 femmes récemment ménopausées en les comparant à un groupe de contrôle ne pratiquant aucun exercise. L'observation a porté sur une période de six mois. Les résultats montrent que le groupe de contrôle et celui qui pratique la marche présentent une déminéralisation osseuse statistiquement significative (1,6% et 1,7% respectivement), contrairement au groupe pratiquant la danse (0,8%). Il n'y a pas d'augmentation significative de la largeur de l'os dans le groupe de contrôle (0,9%), alors qu'elle est importante aussi bien dans le groupe de danse (1,3%) que dans le groupe de marche (1,6%). On a calculé chez chaque sujet, à l'aide des mesures de la teneur en minéraux et de la largeur de l'os, le moment d'inertie d'une section horizontale du radius. Les deux groupes pratiquant un exercise présentent une augmentation significative de cette variable, tandis qu'il n'y en a pas dans le groupe de contrôle. Le taux d'oestrogène plasmatique n'est pas influencé par l'exercise. Ces résultats confirment l'hypothèse selon laquelle les contraintes mécaniques entraînées par l'exercise pourraient prévenir efficacement l'ostéoporose post-ménopausique.
    Notes: Summary The effects of walking and aerobic dancing on the bones of 73 recently postmenopausal women have been compared by photon absorptiometry of the distal radius with a control group who did not exercise. The period of observation was six months. Results showed that the control group and the walking group lost statistically significant amounts of bone mineral content (1.6%, and 1.7% respectively), but that the dancing group did not (0.8%). The control group did not show a significant increase in the bone width (0.9%), but both the dancing (1.3%) and walking (1.6%) groups did. Changes in the cross-sectional moment of inertia of the radius were estimated for each subject based on bone mineral content and bone width values. Both exercise groups experienced significant increases in this variable, while the control group did not. Plasma oestrogen levels were not influenced by exercise. The results support the hypothesis that mechanical loading due to exercise may be effective in preventing postmenopausal osteoporosis.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
  • 2
    Electronic Resource
    Electronic Resource
    New York : Wiley-Blackwell
    Biopolymers 45 (1998), S. 351-353 
    ISSN: 0006-3525
    Keywords: free energy of hydrolysis ; glycyl peptides ; hydrolysis ; peptides ; Chemistry ; Polymer and Materials Science
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Chemistry and Pharmacology
    Notes: For every n amino acids linked in a protein there are n - 1 peptide bonds. The free energy of peptide bond hydrolysis and formation in aqueous solution defines the equilibrium position between peptide and amino acid hydrolysis products. Yet few experimental values exist. With a minimum of assumptions, this paper deduces the free energies of hydrolysis of a variety of peptide bonds. Formation of a dipeptide from two amino acids is about eight times more difficult than subsequent condensations of an amino acid to a dipeptide or longer chain. Condensation of an amino acid to a peptide of any size is five times more difficult than joining two smaller peptides of at least dipeptide size. Thus in an abiogenesis scenario there is a kind of nucleation in peptide bond formation with the initial condensation of two amino acids to yield a dipeptide more difficult than subsequent condensations to a growing chain. © 1998 John Wiley & Sons, Inc. Biopoly 45: 351-353, 1998
    Additional Material: 1 Tab.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
    BibTip Others were also interested in ...
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...