The potential to change pacing and performance during 4000-m cycling time trials using hyperoxia and inspired gas-content deception

Journal article


Davies, Michael J., Clark, Bradley, Garvican-Lewis, Laura A., Welvaert, Marijke, Gore, Christopher J. and Thompson, Kevin G.. (2019) The potential to change pacing and performance during 4000-m cycling time trials using hyperoxia and inspired gas-content deception. International Journal of Sports Physiology and Performance. 14(7), pp. 949 - 957. https://doi.org/10.1123/ijspp.2018-0335
AuthorsDavies, Michael J., Clark, Bradley, Garvican-Lewis, Laura A., Welvaert, Marijke, Gore, Christopher J. and Thompson, Kevin G.
Abstract

Purpose: To determine if a series of trials with fraction of inspired oxygen (FiO2) content deception could improve 4000-m cycling time-trial (TT) performance. Methods: A total of 15 trained male cyclists (mean [SD] body mass 74.2 [8.0] kg, peak oxygen uptake 62 [6] mL·kg−1·min−1) completed six 4000-m cycling TTs in a semirandomized order. After a familiarization TT, cyclists were informed in 2 initial trials they were inspiring normoxic air (NORM, FiO2 0.21); however, in 1 trial (deception condition), they inspired hyperoxic air (NORM-DEC, FiO2 0.36). During 2 subsequent TTs, cyclists were informed they were inspiring hyperoxic air (HYPER, FiO2 0.36), but in 1 trial, normoxic air was inspired (HYPER-DEC). In the final TT (NORM-INFORM), the deception was revealed and cyclists were asked to reproduce their best TT performance while inspiring normoxic air. Results: Greater power output and faster performances occurred when cyclists inspired hyperoxic air in both truthful (HYPER) and deceptive (NORM-DEC) trials than NORM (P < .001). However, performance only improved in NORM-INFORM (377 W; 95% confidence interval [CI] 325–429) vs NORM (352 W; 95% CI 299–404; P < .001) when participants (n = 4) completed the trials in the following order: NORM-DEC, NORM, HYPER-DEC, HYPER. Conclusions: Cycling performance improved with acute exposure to hyperoxia. Mechanisms for the improvement were likely physiological; however, improvement in a deception trial suggests an additional placebo effect. Finally, a particular sequence of oxygen deception trials may have built psychophysiological belief in cyclists such that performance improved in a subsequent normoxic trial.

Keywordsexercise reserve; feedback; placebo; pacing strategy; oxygen content
Year2019
JournalInternational Journal of Sports Physiology and Performance
Journal citation14 (7), pp. 949 - 957
PublisherHuman Kinetics, Inc.
ISSN1555-0265
Digital Object Identifier (DOI)https://doi.org/10.1123/ijspp.2018-0335
Scopus EID2-s2.0-85071434435
Open accessPublished as green open access
Page range949 - 957
Research GroupMary MacKillop Institute for Health Research
Author's accepted manuscript
Publisher's version
Additional information

Accepted author manuscript version reprinted, by permission, from International Journal of Sports Physiology and Performance, 2019, 14 (7), pp. 949 - 957, https://www.doi.org/10.1123/ijspp.2018-0335 . © Human Kinetics, Inc.

Place of publicationUnited States of America
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