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primary purpose of the study was to determine the relationships between
%HRR vs. %VO2R and %HRR vs. %VO2max during maximal
elliptical crosstrainer (ECT) exercise. A secondary aim was to compare
the %HRR vs. %VO2R and %HRR vs. %VO2max relationships
between maximal ECT and treadmill (TM) exercise. Adult subjects (n
= 48) completed a maximal exercise test on the ECT, with a subgroup
(N = 24) also performing a maximal exercise test on the TM. Continuous
HR and VO2 data were analyzed via linear regression to
determine y-intercept and slope values for %HRR vs. %VO2R
and %HRR vs. %VO2max. Student t-tests were used to determine
whether the mean y-intercept and slope values differed from the line
of identity (y-intercept = 0, slope = 1). For each group, both the
y-intercept and slope for %HRR vs. %VO2R fit the line of
identity. Conversely, for all groups both the y-intercept and slope
for %HRR vs. %VO2max were significantly different (p <
0.001) from the line of identity (y-intercept ≠ 0, slope ≠
1). In comparing the regressions of %HRR vs. %VO2R between
exercise modes, there were no significant differences (p > 0.05)
for either y-intercept (ECT = 0.3 vs. TM = -0.3, p = 0.435) or slope
(ECT = 1.01 vs. TM = 1.00, p = 0.079) values. In agreement with previous
research on TM and cycle exercise, it was found that %HRR is more
closely aligned with %VO2R, rather than %VO2max
during ECT exercise. Additionally, it was found that the regressions
of %HRR vs. %VO2R and %HRR vs. %VO2max were
equivalent between the ECT and TM.
KEY
WORDS: Exercise mode, regression, exercise prescription.
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