Skip Navigation LinksHome > October 2010 - Volume 24 - Issue 10 > The Ventilatory Response to Incremental Exercise: Is it One...
Journal of Strength & Conditioning Research:
doi: 10.1519/JSC.0b013e3181e2734a
Original Research

The Ventilatory Response to Incremental Exercise: Is it One or Two Breakpoints?

Carey, Daniel G1; Pliego, German J2; Rohwer, John L1

Collapse Box

Abstract

Carey, DG, Pliego, GJ, and Rohwer, JL. The ventilatory response to incremental exercise: Is it one or two breakpoints? J Strength Cond Res 24(10): 2840-2845, 2010-The primary objective of this study was to determine if the ventilatory (V̇E) breakpoint during incremental exercise to fatigue is best represented by a single breakpoint (BP1), double breakpoint (BP2), or an exponential function (EXP) exhibiting no BP. A secondary objective was to determine if visual assessment of the BP was valid and reliable. Subjects (n = 49) were both men (n = 12) and women (n = 37) who identified either running (n = 31) or triathlon (n = 18) as their primary sport. Subjects completed a maximal oxygen test on a motor-driven treadmill according to a modified Bruce protocol. The difference in mean square error (MSE) for BP1 (4.91 ± 3.35 L) was slightly but significantly (p < 0.05) greater than in MSE for BP2 (2.75 ± 1.7 L) for V̇E. Mean square error for EXP (7.85 ± 5.1 L) was significantly greater (p < 0.05) than BP1 and BP2. Visual assessment of V̇E on scatterplots produced poor validity, with a mean of 71.7% being misclassified compared to the computer model. Both interevaluator reliability (30.6% agreement) and intraevaluator reliability (59.7% agreement) were low. From the results of this study, it is concluded that (a) V̇E exhibits a BP2 model rather than BP1 or EXP and (b) visual assessment of BP is both invalid and unreliable.

© 2010 National Strength and Conditioning Association

 

Login

Article Tools

Share

Search for Similar Articles
You may search for similar articles that contain these same keywords or you may modify the keyword list to augment your search.