Physiological responses to intermittent and continuous exercise at the same relative intensity in older men

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Title Physiological responses to intermittent and continuous exercise at the same relative intensity in older men
Author Morris, Norman; Gass, Gregory Charles; Thompson, Martin; Conforti, David
Journal Name European Journal of Applied Physiology
Editor P E di Prampero
Year Published 2003
Place of publication Germany
Publisher Springer-Verlag
Abstract We investigated the physiological responses in older men to continuous (CEx) and intermittent (IEx) exercise. Nine men [70.4 (1.2) years, O2peak: 2.21 (0.20) l min–1; mean (SE)] completed eight exercise tests (two CEx and six IEx) on an electronically braked cycle ergometer in random order. CEx and IEx were performed at 50% and 70% O2peak. IEx was performed using 60sE:60sR, 30sE:30sR and 15sE:15sR exercise to rest ratios. The duration of exercise was adjusted so that the total amount of work completed was the same for each exercise test. Oxygen uptake (O2), minute ventilation (E) and heart rate (HR) were measured at the mid-point of each exercise test. Arterialised blood samples were obtained at rest and during exercise and analysed for pH and PCO2. At the same relative intensity (50% or 70% O2peak), IEx resulted in a significantly lower (P<0.01) O2, E and HR than CEx. There were no significant differences (P>0.05) in O2, E and HR measured at the mid point of the three exercise to rest ratios at 50% and 70% O2peak. pH and PCO2 during CEx and IEx at 50% O2peak were not significantly different from rest. CEx performed at 70% O2peak resulted in significant decreases (P<0.05) in pH and PCO2. There was a significant decrease (P<0.05) in pH only during the 60sE:60sR IEx at 70% O2peak. Changes in arterialised PCO2 during the 60sE:60sR, 30sE:30sR and 15sE:15sR at both 50% and 70% O2peak exercise tests were not significant. When exercising at the same percentage of O2peak and with the total amount of work fixed, IEx results in significantly lower physiological responses than CEx in older men. All results are given as mean (SE).
Peer Reviewed Yes
Published Yes
Alternative URI http://dx.doi.org/10.1007/s00421-003-0918-z
Volume 90
Page from 620
Page to 625
ISSN 1439-6319
Date Accessioned 2003-12-03
Date Available 2010-07-29T07:41:56Z
Language en_AU
Research Centre Griffith Health Institute; Heart Foundation Research Centre
Faculty Griffith Health Faculty
Subject PRE2009-Exercise Physiology
URI http://hdl.handle.net/10072/6201
Publication Type Journal Articles (Refereed Article)
Publication Type Code c1

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