Objective. This study investigated the effect of cycling position (upright vs. recumbent) and seat position on the oxygen cost of cycling. / Experimental design. A two-factor ANOVA with repeated measures was used to examine the effect of cycling position (Monark 814E, Lifecycle 9100 R, and Lifecycle 9500 RHR ergometers) and seat position (optimum and +/-1 setting) on VO2 and HR. / Participants. Subjects were 10 male physical education students (age = 24 +/- 2.1 years, height = 178.8 +/- 4.8 cm, weight = 76.2 +/- 7.8 kg). / Interventions. Each subject was tested at three 5-minute workloads (55, 137, and 186 Watts) in a random order on the three ergometers. These workloads corresponded with manual settings of 1, 3, and 5 on the Lifecycle ergometers. The cycling protocols for the Lifecycle ergometers were performed with the seat set at 107% of the symphysis pubis measurement and at seat positions of +/-1 setting from the so-called "optimum" setting. / Measures. Physiological response was assessed by continuously monitoring VO2 and HR. / Results. At the optimum seat setting, the VO2 was significantly higher at the three workloads on the Monark compared to both Lifecycle ergometers. Seat positions of +/-1 setting from the recommended setting did not affect VO2. The HR response was non-significant for cycling position and seat position. / Conclusions. The results indicate that the Lifecycle ergometers (9100 R and 9500 RHR) underestimate oxygen consumption and indirectly underestimate energy expenditure. Seat positions of +/-1 setting from the recommended setting on the Lifecycle ergometers did not affect the VO 2.
| Identifer | oai:union.ndltd.org:LACETR/oai:collectionscanada.gc.ca:QMM.35330 |
| Date | January 1997 |
| Creators | Albert, Lee. |
| Contributors | Montgomery, David (advisor) |
| Publisher | McGill University |
| Source Sets | Library and Archives Canada ETDs Repository / Centre d'archives des thèses électroniques de Bibliothèque et Archives Canada |
| Language | English |
| Detected Language | English |
| Type | Electronic Thesis or Dissertation |
| Format | application/pdf |
| Coverage | Master of Arts (Department of Physical Education.) |
| Rights | All items in eScholarship@McGill are protected by copyright with all rights reserved unless otherwise indicated. |
| Relation | alephsysno: 001610551, proquestno: MQ43826, Theses scanned by UMI/ProQuest. |
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