Modeling intermittent cycling performance in hypoxia using the critical power concept

Shearman, Samantha, Dwyer, Dan, Skiba, Phillip and Townsend, Nathan 2016, Modeling intermittent cycling performance in hypoxia using the critical power concept, Medicine and science in sports and exercise, vol. 48, no. 3, pp. 527-535, doi: 10.1249/MSS.0000000000000794.

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Title Modeling intermittent cycling performance in hypoxia using the critical power concept
Author(s) Shearman, Samantha
Dwyer, DanORCID iD for Dwyer, Dan
Skiba, Phillip
Townsend, Nathan
Journal name Medicine and science in sports and exercise
Volume number 48
Issue number 3
Start page 527
End page 535
Total pages 9
Publisher Lippincott Williams & Wilkins
Place of publication Philadelphia, Pa.
Publication date 2016-03
ISSN 1530-0315
Summary PURPOSE: This study investigated the efficacy of an intermittent critical power model, termed the "work-balance" (W'BAL) model, during high-intensity exercise in hypoxia. METHODS: Eleven trained, male cyclists (mean ± SD; age 27 ± 6.6 yr, V[Combining Dot Above]O2peak 4.79 ± 0.56 L.min) completed a maximal ramp test and a 3 min "all-out" test to determine critical power (CP) and work performed above CP (W'). On another day an intermittent exercise test to task failure was performed. All procedures were performed in normoxia (NORM) and hypoxia (HYPO; FiO2 ≈ 0.155) in a single-blind, randomized and counter-balanced experimental design. The W'BAL model was used to calculate the minimum W' (W'BALmin) achieved during the intermittent test. W'BALmin in HYPO was also calculated using CP + W' derived in NORM (N+H). RESULTS: In HYPO there was an 18% decrease in V[Combining Dot Above]O2peak (4.79 ± 0.56 vs 3.93 ± 0.47 L.min ; P<0.001) and a 9% decrease in CP (347 ± 45 vs 316 ± 46 W; P<0.001). No significant change for W' occurred (13.4 ± 3.9 vs 13.7 ± 4.9 kJ; P=0.69; NORM vs HYPO). The change in V[Combining Dot Above]O2peak was significantly correlated with the change in CP (r = 0.72; P=0.01). There was no difference between NORM and HYPO for W'BALmin (1.1 ± 0.9 kJ vs 1.2 ± 0.6 kJ). The N+H analysis grossly overestimated W'BALmin (7.8 ± 3.4 kJ) compared with HYPO (P<0.001). CONCLUSION: The W'BAL model produced similar results in hypoxia and normoxia, but only when model parameters were determined under the same environmental conditions as the performance task. Application of the W'BAL model at altitude requires a modification of the model, or that CP and W' are measured at altitude.
Language eng
DOI 10.1249/MSS.0000000000000794
Field of Research 1106 Human Movement And Sports Science
110699 Human Movement and Sports Science not elsewhere classified
Socio Economic Objective 920499 Public Health (excl. Specific Population Health) not elsewhere classified
HERDC Research category C1 Refereed article in a scholarly journal
ERA Research output type C Journal article
Copyright notice ©2016, Lippincott Williams & Wilkins
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Document type: Journal Article
Collections: Faculty of Health
School of Exercise and Nutrition Sciences
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