| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
|
|
|
|||||||
|
|||||||||
1Department of Physiology, St. George's Hospital Medical School, London, United Kingdom; and 2Canadian Centre for Activity and Ageing, School of Kinesiology, and Department of Physiology and Pharmacology, The University of Western Ontario, London, Ontario, Canada
Submitted 31 July 2005 ; accepted in final form 4 November 2005
The O2 uptake (
O2) response to ramp incremental (RI) exercise does not consistently demonstrate plateau-like behavior at the limit of tolerance, and hence the requirements for a maximum O2 commonly are not met, despite apparent maximum effort. We sought to determine whether an appended step exercise (SE) test at a work rate greater than that achieved in a preceding ramp test would establish the plateau criterion. Seven healthy male adults performed RI cycle ergometry (20 W/min) to the limit of tolerance, followed by 5-min recovery (20 W) and then an SE test at 105% (RISE-105) of the final work rate (WRpeak) achieved during RI. Five of these subjects also performed an RI test followed by SE at 95% WRpeak (RISE-95). O2 was measured breath by breath using a turbine and mass spectrometer. The average of the final 15 s of RI or SE was used to establish respective O2 peaks. When O2 peak was approached, a constant O2 value (e.g., a plateau) was not discernable during any RI or SE component of the tests. Although the WRpeak [mean (SD)] was higher during the SE portion [359 W (SD 31)] than during the RI portion [341 W (SD 29)] of the RISE-105, the peak O2 was not different [SE, 4.30 l/min (SD 0.51); RI, 4.33 l/min (SD 0.52); P = 0.49; n = 7]. Similarly, in the RISE-95 test, WRpeak was 310 W (SD 31) for the SE portion and 326 W (SD 32) for the RI portion, yet the peak O2 values were not different [SE, 4.12 l/min (SD 0.53); RI, 4.11 l/min (SD 0.48); P = 0.78; n = 5]. The lack of notable difference between the O2 peaks established at different WRpeak values in our RISE protocols provides the plateau criterion for verification of maximum O2 in a single test session, even when the data response profiles do not themselves evidence a plateau.
square-wave exercise; maximal aerobic power; O2 uptake kinetics
This article has been cited by other articles:
|
|
 |
|
  B. R. McKay, D. H. Paterson, and J. M. Kowalchuk Effect of short-term high-intensity interval training vs. continuous training on O2 uptake kinetics, muscle deoxygenation, and exercise performance J Appl Physiol, July 1, 2009; 107(1): 128 - 138. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 J. F. de Groot, T. Takken, S. de Graaff, R. H.J.M. Gooskens, P. J.M. Helders, and L. Vanhees Treadmill Testing of Children Who Have Spina Bifida and Are Ambulatory: Does Peak Oxygen Uptake Reflect Maximum Oxygen Uptake? Physical Therapy, July 1, 2009; 89(7): 679 - 687. [Abstract] [Full Text] [PDF]
|
|
|
|
 |
|
 T D Noakes How did A V Hill understand the VO2max and the "plateau phenomenon"? Still no clarity? Br. J. Sports Med., July 1, 2008; 42(7): 574 - 580. [Abstract] [Full Text] [PDF]
|
|
|
|
|
|
T D Noakes Testing for maximum oxygen consumption has produced a brainless model of human exercise performance Br. J. Sports Med., July 1, 2008; 42(7): 551 - 555. [Full Text] [PDF]
|
|
|
|
|
|
N. J. A. Berger, I. T. Campbell, D. P. Wilkerson, and A. M. Jones Influence of acute plasma volume expansion on VO2 kinetics, VO2peak, and performance during high-intensity cycle exercise J Appl Physiol, September 1, 2006; 101(3): 707 - 714. [Abstract] [Full Text] [PDF]
|
|
| HOME | HELP | FEEDBACK | SUBSCRIPTIONS | ARCHIVE | SEARCH | TABLE OF CONTENTS |
| Visit Other APS Journals Online |
