title: The VO2 response to exhaustive square wave exercise: influence of exercise intensity and mode.
abstract: We investigated the oxygen uptake ( VO(2)) response to exhaustive square wave exercise of approximately 2, 5 and 8 min duration in cycling and running. Nine males completed a ramp test and three square wave tests on a motorised treadmill and the same four tests on a cycle ergometer, throughout which gas exchange was assessed (Douglas bag method). The peak VO(2) from the ramp test was higher for running than for cycling [mean (SD): 58.4 (2.8) vs. 55.9 (3.7) ml.kg(-1).min(-1); P=0.04]. However VO(2max) (defined as the highest VO(2) achieved in any of the four tests) did not differ between running and cycling [60.0 (2.9) vs. 58.5 (3.3) ml.kg(-1).min(-1); P=0.15]. The peak VO(2) was similar ( P>0.1) for the 5 and 8 min square wave tests [98.5 (1.8) and 99.2 (2.3) % VO(2max) for running; 97.0 (4.2) and 97.5 (2.0) % VO(2max) for cycling] but lower ( P<0.001) for the 2-min test [91.8 (2.5) and 89.9 (5.5) % VO(2max) for running and cycling respectively]. VO(2) increased over the final two 30-s collection periods of the 2-min test for cycling [Delta VO(2)=0.18 (0.15) l.min(-1); P<0.01] but not running [Delta VO(2)=0.00 (0.09) l.min(-1); P=0.98]. We conclude that in the aerobically fit the peak VO(2) for square wave running or cycling at an intensity severe enough to result in exhaustion in approximately 2 min is below VO(2max). In running, VO(2) plateaus at this sub-maximal rate.
authors.affiliation: School of Sport and Leisure, Oxstalls Campus, University of Gloucestershire, Oxstalls Lane, GL2 9HW, Gloucester, UK. sdraper@glos.ac.uk
authors.forename: S B
authors.initials: SB
authors.lastname: Draper
authors.forename: D M
authors.initials: DM
authors.lastname: Wood
authors.forename: J L
authors.initials: JL
authors.lastname: Fallowfield
mesh_terms: D000328:Adult; D001642:Bicycling / Q000502:physiology*; D015444:Exercise / Q000502:physiology*; D005080:Exercise Test / Q000379:methods*; D017079:Exercise Tolerance / Q000502:physiology*; D006801:Humans; D008297:Male; D010101:Oxygen Consumption / Q000502:physiology*; D010807:Physical Endurance / Q000502:physiology; D005082:Physical Exertion / Q000502:physiology*; D012420:Running / Q000502:physiology*; D013223:Statistics as Topic