Previous studies have suggested that if exercise intensity is established by perceived effort, the metabolic demand varies among exercise machines and the treadmill optimizes energy expenditure (EE). However, these studies have been completed utilizing young people with normal body fat percentages. Therefore, the purpose of this study was to assess whether there was a difference in acute energy expenditure when obese people used different exercise modes at a self-selected intensity (RPE 11-12) commonly recommended for overweight individuals. Twelve obese subjects (7 male; 5 female; BMI >29 kg/m2), aged 37-71 years completed two familiarization trials on four machines: treadmill (TM), stationary cycle (C), Body Trec elliptical arm/leg (BT), and Airdyne (AD). On separate days, subjects then completed a 15 minute trial on each machine at a self-selected intensity corresponding to a target RPE of I 1-12 on the Borg 15 point scale. Machine order was randomly assigned, and subjects were blinded to the workload throughout each trial. Workload was self-adjusted during the first 5 minutes and then remained stable for the rest of the trial. Physiological data were obtained during the last five minutes of each trial via HR telemetry and the Aerosport TEEM 100. The group means were compared across modes using a one-way repeated measures ANOVA. Significant differences (p <0.05) were observed across exercise modes for energy expenditure. The BT produced the highest rate of energy expenditure among exercise machines and C the lowest (8.0±2.0, 6.6±2.1, 6.3±2.0, 5.3±2.1 Kcal/min, for BT, TM, AD, and C, respectively). These results suggest that perceptually-based exercise prescriptions are not reliable across modes typically found in a fitness center environment, and that weight-bearing arm/leg exercise optimizes EE during self-selected exercise of moderate intensity in obese subjects. / School of Physical Education
| Identifer | oai:union.ndltd.org:BSU/oai:cardinalscholar.bsu.edu:handle/186519 |
| Date | January 1999 |
| Creators | Kim, Jong-Kyung |
| Contributors | Whaley, Mitchell H |
| Source Sets | Ball State University |
| Detected Language | English |
| Format | vii, 57 leaves : ill. ; 28 cm. |
| Source | Virtual Press |
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