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purpose of this study was to compare peak cardiorespiratory parameters
during treadmill and cycle ergometry in severely overweight youth.
Twenty-one participants from the Committed to Kids Pediatric Weight
Management program at the Louisiana State University Health Sciences
Center volunteered. Participants completed peak treadmill and cycle
ergometer tests on separate days. In order to examine reliability,
six subjects completed a second treadmill test and seven subjects
a second cycle test. Physical characteristics included the following:
Age (yrs) 12.5 ± 2.8; Body weight (BW) (kg) 78.5 ± 27.0, Height (m)
1.56 ± 0.13; and % fat 42.8 ± 7.5. No statistical significant differences
(p ≤ 0.05) were found between treadmill and cycle peak tests. Treadmill
VO2 peak (l·min-1) averaged 1.57 ± 0.40 and cycle 1.46 ± 0.30 and
VO2 peak relative to BW 21.5 ± 4.1 and 20.3 ± 5.5 for treadmill and
cycle ergometry, respectively. Therefore treadmill values were 7.0%
and 5.6% higher than cycle values. In normal weight or children and
adolescents at risk for overweight, treadmill values typically average
from 7 to 12% higher than cycle values. Reliability of VO2 peak as
indicated by intraclass correlation coefficients ranged from 0.70
to 0.96 for a single or repeated tests. Intra individual variability
averaged 0.5% for VO2 peak (l·min-1) during treadmill ergometry and
5.7% for cycle ergometry. Also, standard errors of measurement were
low (40 to 90 ml min or 1.0 to 1.7 ml.kg-1. min-1) for the peak treadmill
or cycle tests. In summary, our data suggest that both treadmill and
cycle ergometry provide reliable methods for determining VO2 peak
in overweight youth.
KEY
WORDS: VO2 peak, severely overweight youth, treadmill and cycle
ergometry.
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