European Journal of Applied Physiology

, Volume 95, Issue 2–3, pp 146–152 | Cite as

Aerobic training improves insulin sensitivity 72–120 h after the last exercise session in younger but not in older women

  • Eric D. B. Goulet
  • Michel O. Mélançon
  • Mylène Aubertin-Leheudre
  • Isabelle J. Dionne
Original Article

Abstract

The regular practice of aerobic training (AT) induces an improvement in insulin sensitivity (IS) in healthy younger women that persists until 96–120 h after the last exercise bout. Due to the dearth of research data, it still remains unclear whether a regular AT program can improve IS for such a period of time after the last training bout in healthy older women. To address this issue, we trained 14 younger and 8 older women 3 days per week during 6 months, and measured IS 3–5 days after the last training bout. AT consisted of 25–60 min sessions of running at 60–95% of maximal heart rate. Fat mass decreased (8%) in older women only. VO2max and fat-free mass increased in both groups. Only older women decreased bodyweight (4%) and subcutaneous adipose tissue (19%). Visceral adipose tissue decreased in none of the groups. The IS improved only in younger women (relative: 22%; absolute: 24%). The present findings suggest that in older women the improvement in IS following AT is short-lived and results mainly from the acute effect of the last training bout, whereas in younger women the chronic adaptations induced by AT are implicated, as the improvement in IS is maintained beyond the residual effect of the last training bout. From a clinical standpoint, our findings suggest that in older women AT should be performed every day to improve glucose metabolism, whereas in younger women an AT frequency (three times per week) allowing to induce and maintain chronic minimal physiological adaptations would be required.

Keywords

Age-related difference Insulin action Aerobic exercise Women Exercise prescription 

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Copyright information

© Springer-Verlag 2005

Authors and Affiliations

  • Eric D. B. Goulet
    • 1
    • 2
  • Michel O. Mélançon
    • 1
    • 3
  • Mylène Aubertin-Leheudre
    • 1
    • 3
  • Isabelle J. Dionne
    • 1
    • 2
    • 3
  1. 1.Research Centre on Aging, Geriatric Institute of the University of Sherbrooke and Department of Physiology-Biophysics, Faculty of MedicineUniversity of SherbrookeSherbrookeCanada
  2. 2.Department of Physiology and Biophysics, Faculty of MedicineUniversity of SherbrookeSherbrooke
  3. 3.Faculty of Physical EducationUniversity of SherbrookeSherbrookeCanada

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