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Effects of Posture and Exercise Training on Cardiac Output at Rest and During Exercise in Older Subjects.: (English)

Effects of Posture and Exercise Training on Cardiac Output at Rest and During Exercise in Older Subjects.: (English)

          
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About the Book

Background. There are many age related factors that affect the cardiovascular system, including decreased force of cardiac contraction resulting in reduced stroke volume and cardiac output and when coupled with lower maximal heart rate results in a reduced maximal V&d2;O2 . Previous studies have failed to show an improvement in cardiac performance after erect aerobic exercise training, perhaps due to the low exercise intensity. Exercising in the HDT position, where cardiac output may be higher at low exercise levels may result in improved cardiac performance in older individuals. Methods and results. Healthy men and women between the ages of 65-80 years were recruited for this study. They were pre-tested to measure cardiac function at rest and exercise in both the head-down tilt (HDT) and erect positions. Subjects then completed either a HDT or erect cycling exercise program. Both programs lasted 8 weeks, with 1 hour sessions three times a week. Pre and post exercise testing was performed. There was no change in (oxygen consumption) V&d2;O2 between positions (p>0.05), however pre-HDT position had a 26% higher resting cardiac output (CO) and a 35% higher stroke volume (SV) than in the pre-erect position (p0.05). Although the general pattern was similar, women did not benefit as much from either HDTT or ET as men. Conclusions. The HDTT increased cardiovascular function more than the ET program in older adults. This may be due to the fact that in the HDTT the cardiac output was higher during training and thus had a bigger effect, presumably due to the higher end-diastolic volume in the HDT position than erect and should be recommended for training older individuals.


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Product Details
  • ISBN-13: 9781243014467
  • Publisher: Proquest, Umi Dissertation Publishing
  • Publisher Imprint: Proquest, Umi Dissertation Publishing
  • Height: 254 mm
  • No of Pages: 72
  • Series Title: English
  • Weight: 163 gr
  • ISBN-10: 1243014466
  • Publisher Date: 29 Aug 2011
  • Binding: Paperback
  • Language: English
  • Returnable: N
  • Spine Width: 5 mm
  • Width: 203 mm


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Effects of Posture and Exercise Training on Cardiac Output at Rest and During Exercise in Older Subjects.: (English)
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Effects of Posture and Exercise Training on Cardiac Output at Rest and During Exercise in Older Subjects.: (English)
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