NDLI: Oxygen uptake, heart rate, and ratings of perceived exertion at the PWCVo2.

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Oxygen uptake, heart rate, and ratings of perceived exertion at the PWCVo2.

Content Provider	World Health Organization (WHO)-Global Index Medicus
Author	Mielke, Michelle Housh, Terry J. Hendrix, C. Russell Camic, Clayton L. Zuniga, Jorge M. Schmidt, Richard J. Johnson, Glen O.
Description	Country affiliation: United States Author Affiliation: Mielke M ( Department of Nutrition and Health Sciences, Human Performance Laboratory, University of Nebraska-Lincoln, Lincoln, Nebraska, USA. mmielke@unlserve.unl.edu)
Abstract	The purpose of the present study was to examine the oxygen uptake (Vo2), heart rate (HR), and ratings of perceived exertion (RPE [OMNI-Leg 0-10]) responses during continuous 1-hour cycle ergometer rides at the PWCVo2 (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 Vo2peak 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 PWCVo2 and a continuous 1-hour cycle ergometer ride at the PWCVo2 during which Vo2, HR, and RPE data were collected every 2 minutes. The PWCVo2 (114 +/- 39 W) and VT (133 +/- 44 W) were not significantly different and occurred at 56 and 63% Vo2peak, respectively. Linear regression showed that the slope coefficients for the Vo2, 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 x min(-1) (the rate of increase in HR that can be maintained for an 8-hour day). The results of this study indicated that PWCVo2 could be maintained for an extended period. However, the maximal power output associated with steady state Vo2, HR, and RPE responses was overestimated. The mean increase in Vo2 during the continuous 1-hour ride was 270 mL, which suggested that the PWCVo2 may demarcate the moderate from heavy exercise domains. The mean HR slope coefficient of 0.3 bpm x min(-1) indicated that the power output at the PWCVo2 could likely be maintained for greater than 2 hours.
File Format	HTM / HTML
ISSN	10648011
Issue Number	4
Volume Number	23
e-ISSN	15334287
Journal	Journal of Strength and Conditioning Research
Language	English
Publisher	Lippincott Williams & Wilkins
Publisher Date	2009-07-01
Publisher Place	United States
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Discipline Sport Sciences Exercise Test Methods Heart Rate Physiology Oxygen Consumption Physical Endurance Physical Exertion Analysis Of Variance Electromyography Female Humans Linear Models Male Muscle Fatigue Muscle, Skeletal Pulmonary Ventilation Young Adult Journal Article
Content Type	Text
Resource Type	Article
Subject	Orthopedics and Sports Medicine Physical Therapy, Sports Therapy and Rehabilitation Sports Science

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