The physiological basis of training responses in women, and particularly older women, is not well understood. Short-term aerobic training (STAT) was used to probe the effects of age and hormone-replacement therapy (HRT) on women's ability to rapidly change peak uptake (VO2max), plasma volume and cardiac function. A total of 39 females participated in the STAT programme: 15 younger (Y; aged 19–29 years), 12 postmenopausal women undergoing HRT and 12 non-medicating postmenopausal (PM) women (aged 60–75 years). Training consisted of ten sessions of cycling over a 2-week period, which progressed in duration from 20 to 60min and in intensity from 60–75% of maximum heart rate. Plasma volume (PV; as determined by Evan's Blue dye dilution), VO2max (cycle ergometry) and cardiac function (radionuclide ventriculography) were analysed using analysis of covariance or repeated measures ANOVA. All groups demonstrated similar increase in VO2max (Y, 13%; PM, 17%; HRT, 13%), but without a significant change in left-ventricular ejection fraction and diastolic function or volumes during supine exercise. PV expansion was observed among the Y group (7%; P<0.05) but not the PM group (2%; P>0.05) or women undergoing HRT (1%; P>0.05). Age and hormone-replacement status did not affect the magnitude of VO2max change. This study suggests that STAT improves VO2max, independent of central adaptations.
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Research Article|
February 14 2003
Short-term aerobic training and circulatory function in women: age and hormone-replacement therapy
Sonia KATYAL;
Sonia KATYAL
*Graduate Department of Rehabilitation Science, University of Toronto, 256 McCaul Street, Toronto, ON, Canada M5T 1W5
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Michael FREEMAN;
Michael FREEMAN
†St Michael's Hospital, 30 Bond Street, Toronto, ON, Canada M5B 1W8
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Judith A. MILLER;
Judith A. MILLER
‡Toronto General Hospital, 200 Elizabeth Street, Toronto, ON, Canada M5G 2C4
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Scott G. THOMAS
*Graduate Department of Rehabilitation Science, University of Toronto, 256 McCaul Street, Toronto, ON, Canada M5T 1W5
§Department of Physical Therapy, Rehabilitation Sciences Building, University of Toronto, 500 University Avenue, Toronto, ON, Canada MG5 1V7
Correspondence: Dr Scott G. Thomas, at Faculty of Physical Education and Health, 55 Harbord St, Toronto, Canada M5S 2W6 (e-mail scott.thomas@utoronto.ca).
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Publisher: Portland Press Ltd
Received:
July 09 2002
Revision Received:
October 25 2002
Accepted:
November 29 2002
Online ISSN: 1470-8736
Print ISSN: 0143-5221
The Biochemical Society and the Medical Research Society © 2003
2003
Clin Sci (Lond) (2003) 104 (3): 267–273.
Article history
Received:
July 09 2002
Revision Received:
October 25 2002
Accepted:
November 29 2002
Citation
Sonia KATYAL, Michael FREEMAN, Judith A. MILLER, Scott G. THOMAS; Short-term aerobic training and circulatory function in women: age and hormone-replacement therapy. Clin Sci (Lond) 1 March 2003; 104 (3): 267–273. doi: https://doi.org/10.1042/cs1040267
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