The effect of aerobic fitness on exercise-induced diaphragmatic fatigue in females
department or school: Education, Faculty of
department or school: Kinesiology, School of
data provider: DSpace
degree campus: UBCV
creator: Payne, Owen
issued: 2023-12-07T18:33:50Z
issued: 2023
related degree: Master of Science - MSc
degree grantor: University of British Columbia
description: The magnitude of exercise-induced diaphragmatic fatigue (EIDF) is similar in males irrespective of aerobic fitness. When compared to aerobically fit males, aerobically fit females appear less susceptible to EIDF. We hypothesized that chronic endurance training and regular exposure to high levels of exercise hyperpnea may confer EIDF resistance in aerobically fit females when compared to healthy females with average aerobic fitness. Healthy females (25 ± 4 years) performed graded cycle exercise to exhaustion to characterize aerobic fitness and were assigned into a highly-aerobically fit (Hi-Fit) or averagely-aerobically fit (Avg-Fit) group (Hi-Fit: n = 9, V̇O₂max = 56.1 ± 3.4 mL/kg/min; Avg-Fit: n = 9, V̇O₂max = 35.7 ± 4.9, p < 0.001). Participants then completed high intensity (~90% V̇O₂max) cycling exercise (Hi-Fit: 257 ± 29 W, Avg-Fit: 135 ±10 W, p < 0.001) to exhaustion. Changes in transdiaphragmatic twitch pressure (Pdi,tw), evoked by cervical magnetic stimulation (CMS), were used to assess EIDF between baseline and 5-, 30-, and 60-minutes after exercise cessation. Time to exhaustion (TTE) was similar between groups (Hi-Fit: 546 ± 178 seconds; Avg-Fit: 559 ±175 seconds, p = 0.876). The reduction in Pdi,tw relative to baseline at 5-, 30-, and 60-minutes after exercise cessation was 82.5 ± 12.0, 93.9 ± 9.8, 97.5 ± 5.6% and 87.8 ± 8.5, 97.7 ± 6.9, 101.8 ± 5.0%, in the Hi-Fit and Avg-Fit groups, respectively. There was no main effect of fitness on the exercise-induced fall in Pdi,tw or during the subsequent recovery (p = 0.186). We conclude that aerobic fitness does not affect the relative magnitude of EIDF in females. Similar to what has been observed in aerobically fit males, chronic endurance training and its concomitant hyperpnea do not appear to provide additional EIDF protection in females.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/86774
note: The Effect of Aerobic Fitness on Exercise-Induced Diaphragmatic Fatigue in Females by Owen Payne B.Sc., Queen’s University, 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) December 2023 © Owen Payne, 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: The Effect of Aerobic Fitness on Exercise-Induced Diaphragmatic Fatigue in Females submitted by Owen Payne in partial fulfilment of the requirements for the degree of Master of Science in Kinesiology Examining Committee: Dr. William Sheel, Professor, Kinesiology, UBC Supervisor Dr. Donald McKenzie, Professor Emeritus, Medicine, UBC Supervisory Committee Member Dr. Jeremy Road, Professor Emeritus, Medicine, UBC Supervisory Committee Member iii Abstract The magnitude of exercise-induced diaphragmatic fatigue (EIDF) is similar in males irrespective of aerobic fitness. When compared to aerobically fit males, aerobically fit females appear less susceptible to EIDF. We hypothesized that chronic endurance training and regular exposure to high levels of exercise hyperpnea may confer EIDF resistance in aerobically fit females when compared to healthy females with average aerobic fitness. Healthy females (25  4 years) performed graded cycle exercise to exhaustion to characterize aerobic fitness and were assigned into a highly-aerobically fit (Hi-Fit) or averagely-aerobically fit (Avg-Fit) group (Hi-Fit: n = 9, V̇O2max = 56.1  3.4 mL/kg/min; Avg-Fit: n = 9, V̇O2max = 35.7  4.9, p < 0.001). Participants then completed high intensity (~90% V̇O2max) cycling exercise (Hi-Fit: 257  29 W, Avg-Fit: 135  10 W, p < 0.001) to exhaustion. Changes in transdiaphragmatic twitch pressure (Pdi,tw), evoked by cervical magnetic stimulation (CMS), were used to assess…
has type: Thesis/Dissertation
date issued: 2024-05
is shown at: 10.14288/1.0438096
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: Sheel, A. William
type: Text
identifier URI: http://hdl.handle.net/2429/86774