Investigating the susceptibility of cardiorespiratory responses to ozone during cycling exercise
department or school: Education, Faculty of
department or school: Kinesiology, School of
data provider: DSpace
degree campus: UBCV
creator: Harris, Owen Drake
issued: 2023-08-30T21:33:40Z
issued: 2023
related degree: Master of Science - MSc
degree grantor: University of British Columbia
description: Ground-level ozone (O₃) is a common airborne pollutant well recognized to impair pulmonary function and cause negative respiratory symptoms when inhaled. Due to a wide range of inter-individual variability in responses, a lack of consensus as to whether O₃ exposure limits exercise capability exists. Healthy, well-trained male (n=13) and female (n=7) endurance athletes were recruited to complete a double-blinded, randomized crossover study to address the research question. Participants were screened for inclusion based on a cycling maximal oxygen consumption (V̇O₂max) test (Visit 1), before resting exposure to 750 parts per billion (ppb) O₃ (Visit 2) to assess pulmonary function changes. During experimental trials (Visit 3 & 4), participants completed submaximal and maximal cycling exercise protocols exposed to both O₃ (170 ppb) and room air (RA, <10 ppb O₃). Results (n=20, V̇O₂max = 64.1 ± 7.0 ml/kg/min) indicated that pulmonary function was significantly reduced and development of adverse respiratory symptoms was increased following both resting and exercise O₃ exposure. No differences between conditions in ventilatory pattern or oxygen consumption (V̇O₂) were observed throughout submaximal exercise bouts. Paired t-tests comparing the last minute of a time-to-exhaustion (TTE) test at 105% of peak power showed lower relative V̇O₂ (p=0.003), tidal volume (p=0.007) and minute ventilation (p=0.047) during O₃ compared to RA conditions, with insignificant trends towards lower exercise time (p=0.092). As differences in relative V̇O₂ (p<0.001) and tidal volume (p=0.001) also existed when comparing each participant’s last shared minute between conditions, a respiratory limitation of oxygen transport to the exercising muscle groups during maximal exercise seems likely. A clearer understanding of the mechanisms that impact oxygen consumption during O₃ exposure and exercise is critical to maximizing performance in athletic events exposed to high levels of pollution.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/85708
note: INVESTIGATING THE SUSCEPTIBILITY OF CARDIORESPIRATORY RESPONSES TO OZONE DURING CYCLING EXERCISE by OWEN DRAKE HARRIS B.H.K., The University of British Columbia Okanagan, 2021 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE in THE FACULTY OF GRADUATE AND POSTDOCTORAL STUDIES (Kinesiology) THE UNIVERSITY OF BRITISH COLUMBIA (Vancouver) August 2023 © Owen Drake Harris, 2023 ii The following individuals certify that they have read, and recommend to the Faculty of Graduate and Postdoctoral Studies for acceptance, the thesis entitled: Investigating the susceptibility of cardiorespiratory responses to ozone during cycling exercise submitted by Owen Drake Harris in partial fulfilment of the requirements for the degree of Master of Science in Kinesiology Examining Committee: Dr. Michael Koehle, Professor, School of Kinesiology, UBC Supervisor Dr. William Sheel, Professor, School of Kinesiology, UBC Supervisory Committee Member Dr. Valérie Bougault, Associate Professor, Sciences du Sport, Université Côte d'Azur Supervisory Committee Member iii Abstract Ground-level ozone (O3) is a common airborne pollutant well recognized to impair pulmonary function and cause negative respiratory symptoms when inhaled. Due to a wide range of inter-individual variability in responses, a lack of consensus as to whether O3 exposure limits exercise capability exists. Healthy, well-trained male (n=13) and female (n=7) endurance athletes were recruited to complete a double-blinded, randomized crossover study to address the research question. Participants were screened for inclusion based on a cycling maximal oxygen consumption (?̇?O2max) test (Visit 1), before resting exposure to 750 parts per billion (ppb) O3 (Visit 2) to assess pulmonary function changes. During experimental trials (Visit 3 & 4), participants completed submaximal and maximal cycling exercise protocols exposed to both O3 (170 ppb) and room air (RA, <10 ppb O3). Results (n=20, ?̇?…
has type: Thesis/Dissertation
date issued: 2023-11
is shown at: 10.14288/1.0435664
language: eng
degree discipline: Kinesiology
provider: Vancouver : University of British Columbia Library
publisher: University of British Columbia
rights: Attribution-NonCommercial-NoDerivatives 4.0 International
rights URI: http://creativecommons.org/licenses/by-nc-nd/4.0/
scholar level: Graduate
contributor: Koehle, Michael
type: Text
identifier URI: http://hdl.handle.net/2429/85708