Fatigability and adaptation to maximal eccentric exercise in young females and males
department or school: Health and Social Development, Faculty of (Okanagan)
department or school: Health and Exercise Sciences, School of (Okanagan)
data provider: DSpace
degree campus: UBCO
creator: Bruce, Christina Dominique
issued: 2019-04-24T15:30:26Z
issued: 2019
related degree: Master of Science - MSc
degree grantor: University of British Columbia
description: In addition to fatigue, performance of unaccustomed eccentric (ECC) exercise causes temporary muscle damage, initiating a protective response to minimize damage from a subsequent bout (i.e., the repeated-bout effect; RBE). Indirect evidence suggests females experience greater muscle damage following ECC maximal voluntary contractions (MVCs). If true, this could induce a larger RBE for females than males; however, the RBE has not been compared between the sexes. PURPOSE: To compare fatigue and damage induced by ECC MVCs as well as the magnitude of the RBE in females and males. METHODS: Twelve males (21.6 ± 2.2yrs; 1.8 ± 0.1m; 82.4 ± 12.4kg) and twelve females (23.5 ± 3.0yrs; 1.6 ± 0.1m; 60.1 ± 4.1kg) performed two bouts (separated by four weeks) of 200 ECC MVCs of the dorsiflexors (60°/s from an ankle angle of 90° to 30° of plantar flexion; 4 sets of 50 reps; 1min rest between sets). Isometric (ISO) MVC torque and the ratio of ISO torque responses to low vs. high frequencies of electrical stimulation (10:100Hz) were compared before and after (2, 3, 5, and 10min, as well as 2, 4, and 7d) the fatiguing protocol. RESULTS: Measures of fatigue (ECC MVC torque) and damage (ISO MVC torque and 10:100Hz ratio) did not differ for females and males for bout one (all P > 0.05). Pooled data revealed decreases of 31.6 ± 13.4% for ECC MVC torque, 25.2 ± 13.9% for ISO MVC torque (2min post-exercise) and 53.6 ± 9.0% for 10:100Hz ratio (10min post-exercise). A two-way repeated measures ANOVA determined no main effect of sex or bout for any measure except the 10:100Hz ratio. Recovery of the ratio improved between bouts for both females and males (P < 0.05). CONCLUSION: Our results suggest that an initial bout of ECC MVCs causes equivalent fatigue and muscle damage of the dorsiflexors for females and males. After bout two, acute decreases in the 10:100Hz ratio are attenuated for both groups, suggesting a similar RBE for both females and males.
aggregated CHO: https://circle.library.ubc.ca/rest/handle/2429/69907
note: FATIGABILITY AND ADAPTATION TO MAXIMAL ECCENTRIC EXERCISE IN YOUNG FEMALES AND MALES by Christina Dominique Bruce B.Sc., Mount Royal University, 2015 A THESIS SUBMITTED IN PARTIAL FULFILLMENT OF THE REQUIREMENTS FOR THE DEGREE OF MASTER OF SCIENCE in THE COLLEGE OF GRADUATE STUDIES (Health and Exercise Sciences) THE UNIVERSITY OF BRITISH COLUMBIA (Okanagan) April 2019 © Christina Dominique Bruce, 2019 ii The following individuals certify that they have read, and recommend to the College of Graduate Studies for acceptance, a thesis/dissertation entitled: Fatigability and adaptation to maximal eccentric exercise in young females and males submitted by Christina Dominique Bruce in partial fulfillment of the requirements of the degree of Master of Science Dr. Chris McNeil, School of Health and Exercise Science Supervisor Dr. Brian Dalton, School of Health and Exercise Sciences Supervisory Committee Member Dr. Jennifer Jakobi, School of Health and Exercise Sciences Supervisory Committee Member Dr. Timothy Inglis, School of Kinesiology, University of British Columbia Vancouver University Examiner iii Abstract In addition to fatigue, performance of unaccustomed eccentric (ECC) exercise causes temporary muscle damage, initiating a protective response to minimize damage from a subsequent bout (i.e., the repeated-bout effect; RBE). Indirect evidence suggests females experience greater muscle damage following ECC maximal voluntary contractions (MVCs). If true, this could induce a larger RBE for females than males; however, the RBE has not been compared between the sexes. PURPOSE: To compare fatigue and damage induced by ECC MVCs as well as the magnitude of the RBE in females and males. METHODS: Twelve males (21.6 ± 2.2yrs; 1.8 ± 0.1m; 82.4 ± 12.4kg) and twelve females (23.5 ± 3.0yrs; 1.6 ± 0.1m; 60.1 ± 4.1kg) performed two bouts (separated by four weeks) of 200 ECC MVCs of the dorsiflexors (60°/s from an ankle angle of 90° to 30° of plantar flexion; 4 sets of 50 reps; 1min res…
has type: Thesis/Dissertation
date issued: 2019-05
is shown at: 10.14288/1.0378432
language: eng
degree discipline: Health and Exercise Sciences
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
type: Text
identifier URI: http://hdl.handle.net/2429/69907