Document Detail

The ventilatory response to incremental exercise: is it one or two breakpoints?
MedLine Citation:
PMID:  20885203     Owner:  NLM     Status:  In-Process    
The primary objective of this study was to determine if the ventilatory (&OV0312;E) 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 VE. Mean square error for EXP (7.85 ± 5.1 L) was significantly greater (p < 0.05) than BP1 and BP2. Visual assessment of VE 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) VE exhibits a BP2 model rather than BP1 or EXP and (b) visual assessment of BP is both invalid and unreliable.
Daniel G Carey; German J Pliego; John L Rohwer
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Publication Detail:
Type:  Journal Article    
Journal Detail:
Title:  Journal of strength and conditioning research / National Strength & Conditioning Association     Volume:  24     ISSN:  1533-4287     ISO Abbreviation:  J Strength Cond Res     Publication Date:  2010 Oct 
Date Detail:
Created Date:  2010-10-04     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  9415084     Medline TA:  J Strength Cond Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  2840-5     Citation Subset:  IM    
Health and Human Performance Department, University of St. Thomas, St. Paul, Minnesota, USA.
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