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JOURNAL
OF
SPORTS SCIENCE &
MEDICINE
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Research
article
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EFFECT OF EXERCISE INTENSITY ON DIFFERENTIATED AND UNDIFFERENTIATED RATINGS OF PERCEIVED EXERTION DURING CYCLE AND TREADMILL EXERCISE IN RECREATIONALLY ACTIVE AND TRAINED WOMEN |
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Melinda R. Bolgar1  ,
Carol E. Baker2, Fredric. L. Goss2, Elizabeth Nagle2
and Robert J. Robertson2 |
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1Jacksonville State University, Jacksonville, AL, USA, 2University of Pittsburgh, Pittsburgh, PA, USA |
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© Journal of Sports Science and Medicine (2010) 9, 557 - 563 |
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| ABSTRACT | |||
| The purpose of the study is to examine the effect of aerobic exercise
intensity on components of the differentiated perceived exertion model in
young women performing weight bearing and non-weight bearing aerobic exercise.
Subjects were 18-25 yr old women who were recreationally active (n = 19;
VO2max = 33.40 ml·kg-1·min-1) and trained (N = 22;
VO2max = 43.3 ml·kg-1·min-1). Subjects underwent two
graded exercise tests (GXT) on a treadmill and bike which were separated
by 48 hours. RPE-Overall, -Legs, and -Chest, as well as oxygen uptake (VO2)
and heart rate were recorded each minute. Individual regression analyses
were used to identify RPE-Overall,-Legs, and -Chest at 40, 60, 80% VO2max/peak.
Separate two factor (site (3) x intensity (3)) ANOVAs with repeated measures
on site and intensity were computed for each training status. Furthermore,
RPE responses were also examined with a one factor (site (3)) within subject
ANOVA with repeated measure on site at the ventilatory breakpoint. For both
the recreationally active and trained groups no significant differences
were observed for RPE-Overall, -Legs, and -Chest during treadmill exercise.
However, for cycling exercise results indicated that RPE-Legs was significantly
greater at all exercise intensities than RPE-Overall and RPE-Chest for trained
subjects while for recreationally active subjects RPE-Legs was only significantly
higher at the highest exercise intensity. Responses at the ventilatory breakpoint
during cycle exercise indicated that RPE-Legs was significantly greater
than RPE-Chest and RPE-Overall for trained subjects but not for recreationally
active subjects. Signal dominance was not observed at an intensity equivalent
to the ventilatory breakpoint during treadmill exercise in either of the
groups. In recreationally active and trained females signal dominance was
demonstrated only during cycling exercise, but not during treadmill exercise.
Signal integration could not be demonstrated during cycling and treadmill
exercise at various intensities.
Key words: Aerobic exercise, physical exertion, oxygen consumption, physical fitness. |
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