Oxygen Uptake, Heart Rate, and Ratings of Perceived Exertion at the PWC

• Autores: Michelle Mielke, Terry J. Housh, C. Russell Hendrix, Clayton L. Camic, Jorge M. Zuniga, Richard J. Schmidt, Glen O. Johnson
• Localización: Journal of strength and conditioning research: the research journal of the NSCA, ISSN 1064-8011, Vol. 23, Nº. 4, 2009, págs. 1292-1299
• Idioma: inglés
• Texto completo no disponible (Saber más ...)
• Resumen

  • The purpose of the present study was to examine the oxygen uptake ([latin capital V with dot above]o2), heart rate (HR), and ratings of perceived exertion (RPE [OMNI-Leg 0-10]) responses during continuous 1-hour cycle ergometer rides at the PWC[latin capital V with dot above]o2 (physical working capacity at the oxygen consumption threshold). Eight subjects (mean age ± SD = 23 ± 3.2 years) performed a maximal test to exhaustion for the determination of [latin capital V with dot above]o2peak and ventilatory threshold (VT). The subjects also performed 4 randomly ordered 8-minute workbouts at different power outputs (ranging from 84 to 245 W) to determine the PWC[latin capital V with dot above]o2 and a continuous 1-hour cycle ergometer ride at the PWC[latin capital V with dot above]o2 during which [latin capital V with dot above]o2, HR, and RPE data were collected every 2 minutes. The PWC[latin capital V with dot above]o2 (114 ± 39 W) and VT (133 ± 44 W) were not significantly different and occurred at 56 and 63% [latin capital V with dot above]o2peak, respectively. Linear regression showed that the slope coefficients for the [latin capital V with dot above]o2, HR, and RPE vs. time relationships for the continuous 1-hour workbouts were significantly greater than zero. Furthermore, a t-test about a single mean indicated that the mean slope coefficient for the HR vs. time relationship was significantly greater than 0.1 bpm·min-1 (the rate of increase in HR that can be maintained for an 8-hour day). The results of this study indicated that PWC[latin capital V with dot above]o2 could be maintained for an extended period. However, the maximal power output associated with steady state [latin capital V with dot above]o2, HR, and RPE responses was overestimated. The mean increase in [latin capital V with dot above]o2 during the continuous 1-hour ride was 270 mL, which suggested that the PWC[latin capital V with dot above]o2 may demarcate the moderate from heavy exercise domains. The mean HR slope coefficient of 0.3 bpm·min-1 indicated that the power output at the PWC[latin capital V with dot above]o2 could likely be maintained for greater than 2 hours.