Insights into central and peripheral factors affecting the ''oxidative performance'' of skeletal muscle in aging (Articolo in rivista)

Type
Label
  • Insights into central and peripheral factors affecting the ''oxidative performance'' of skeletal muscle in aging (Articolo in rivista) (literal)
Anno
  • 2007-01-01T00:00:00+01:00 (literal)
Alternative label
  • Ferri A. 1,2, Adamo S. 1,2, Longaretti M. 1, Marzorati M. 3, Lanfranconi F. 1, Marchi A. 4, Grassi B. 1,3 (2007)
    Insights into central and peripheral factors affecting the ''oxidative performance'' of skeletal muscle in aging
    in European journal of applied physiology (Print)
    (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori
  • Ferri A. 1,2, Adamo S. 1,2, Longaretti M. 1, Marzorati M. 3, Lanfranconi F. 1, Marchi A. 4, Grassi B. 1,3 (literal)
Pagina inizio
  • 571 (literal)
Pagina fine
  • 579 (literal)
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  • 100 (literal)
Rivista
Note
  • ISI Web of Science (WOS) (literal)
Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni
  • 1. Dipartimento di Scienze e Tecnologie Biomediche, Università degli Studi, Milano 2. Dipartimento di Medicina Sperimentale, Ambientale e Biotecnologie Mediche, Università degli Studi di Milano-Bicocca, Monza (MI) 3. Istituto di Bioimmagini e Fisiologia Molecolare del CNR, Segrate (MI) 4. Centro Interdisciplinare di Medicina dello Sport, Università degli Studi di Pavia, IRCCS Fondazione S. Maugeri, Pavia (literal)
Titolo
  • Insights into central and peripheral factors affecting the ''oxidative performance'' of skeletal muscle in aging (literal)
Abstract
  • During exercises with relatively small muscle masses, limitations to exercise performance by the cardiovascular system should be significantly reduced, allowing one to fully-test the \"oxidative potential\" of the investigated muscles. Ten elderly males (E, 77.8 +/- 2.9 years [ [Formula: see text]]) and eight young controls (Y, 26.6 +/- 3.0) underwent incremental exercises to voluntary exhaustion on a dynamic leg-extension (dominant limb) machine (knee-extension, KE) and on a cycloergometer (CYCLO). During KE the load was increased every 3 min to loads corresponding to 20, 40 and 60% of the force of one-repetition maximum (1RM). The following variables were determined (vastus lateralis muscle): concentration changes of deoxygenated haemoglobin and myoglobin (Delta[deoxy(Hb + Mb)]) by near-infrared spectroscopy (NIRS), expressed as percentage of the maximal value obtained during transient limb ischemia, and taken as an index of O(2) extraction; root mean square (RMS) and median power frequency (MDF) by electromyography. The total lifted load during KE and peak workload during CYCLO were lower in E versus Y (620.4 +/- 321.9 kg vs. 1347.4 +/- 458.7; 113.5 +/- 23.9 W vs. 224.3 +/- 41.0, respectively). During CYCLO Delta[deoxy(Hb + Mb)] peak (i.e. the value determined at exhaustion) was lower in E (44.5 +/- 17.7%) versus Y (67.1 +/- 22.9), whereas during KE Delta[deoxy(Hb + Mb)] peak was higher in E (56.8 +/- 20.9%) versus Y (38.6 +/- 15.8). \"Thresholds\", that is abrupt increases in RMS slopes, were detected in Y but not in E, suggesting less recruitment or a preferential atrophy of type 2 fibers in the elderly. These findings, associated with the preserved capacity of O(2) extraction, suggest a shift towards oxidative metabolism in skeletal muscles of 78 year-old subjects, which could preserve, at least in part, their capacity to carry out exercise. (literal)
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