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Excerpt
This study compared relative physiological responses at 2 self-selected exercise intensities among four exercise machines: treadmill (TM), leg cycle (C), Body Trec elliptical arm/leg (BT), and Airdyne (AD). Twenty subjects (8 M/12 F; age 44±12 yrs) completed a maximal exercise test and a 15 min production trial (PT) on each machine at self-selected workrates corresponding to target RPEs of 11-12 (LOW) and 15-16 (HIGH). Workloads were self-adjusted for 5 minutes and remained stable for the rest of the trial. Test order was randomly assigned, and subjects were blinded to workloads during each of the PTs. Heart rate (HR) and oxygen uptake (VO2) were obtained during the last 5 min of each PT via HR telemetry and Aerosport TEEM 100_. Mode-specific peak VO2 (ml/kg/min) and HR were TM (36.0±10; 178±18); C (28.2±10; 162±20); AD (30.6±10; 170±18); BT (30.6±9; 170±17). Peak TM VO2 & HR were significantly higher than other modes, and peak C HR was < AD & BT (p<0.05). Mode-specific relative HR (%MHRR) and VO2 (%VO2peak) were compared across modes using a one-way repeated measures ANOVA. (Table)
BT & AD elicited higher mean %VO2 during LOW PTs, and BT had > %MHRR than other modes. No significant mean differences in %VO2 or %MHRR were observed across HIGH PTs. Considerable inter-individual variability was observed for relative intensity on all machines and at both intensities (S.D.±10-20%). These data indicate that generalized RPE targets (i.e., 11-12) yield less reliable relative physiological data during arm/leg exercise compared to leg only exercise and may not result in expected intensities (i.e., %VO2/%MHRR) during exercise training.
