title: Relationship Between %Heart Rate Reserve And %VO2 Reserve During Elliptical Crosstrainer Exercise.
abstract: The 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 PointsThe present study showed that %HRR is aligned with %VO2R, not %VO2max, during maximal ellipitcal crosstrainer exercise.It was found that the relationships between %HRR vs. %VO2R and %HRR vs. %VO2max were equivalent between the ellipitcal crosstrainer and treadmill.This study revealed that the elliptical crosstrainer produced similar maximal physiological values (VO2max, HRmax, RERmax) compared to treadmill running during VO2max testing.
authors.affiliation: Human Performance Laboratory, University of Wisconsin - Eau Claire, Eau Claire, WI USA.
authors.forename: Lance C
authors.initials: LC
authors.lastname: Dalleck
authors.affiliation: Human Performance Laboratory, University of Wisconsin - Eau Claire, Eau Claire, WI USA.
authors.forename: Len
authors.initials: L
authors.lastname: Kravitz
keywords: Exercise mode; exercise prescription; regression