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Permanent link (DOI): https://doi.org/10.7939/R3XH3J

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Theses and Dissertations

The effect of aerobic fitness on the cardiovascular and sympathetic nervous system response to physiological stress at rest and during dynamic exercise Open Access

Descriptions

Other title
Subject/Keyword
blood pressure
vascular conductance
exercise
VO2max
vasoconstriction
sympathetic nervous system
physiological stress
Type of item
Thesis
Degree grantor
University of Alberta
Author or creator
Raymond, Duncan A
Supervisor and department
DeLorey, Darren (Physical Education and Recreation)
Examining committee member and department
McCargar, Linda (Agricultural, Food and Nutritional Science)
Kennedy, Michael (Physical Education and Recreation)
Department
Physical Education and Recreation
Specialization

Date accepted
2012-09-26T09:19:19Z
Graduation date
2012-09
Degree
Master of Science
Degree level
Master's
Abstract
A cardio-protective adaptation associated with aerobic fitness may be an attenuated sympathetic nervous system (SNS) and cardiovascular response to stress. The hypothesis that the cardiovascular and SNS responses to physiological stress at rest and during exercise would be a function of maximal aerobic capacity (VO2max) was investigated. Young males performed ramp cycling exercise to determine VO2max and were then assigned to low (n=8), mid (n=8) and high (n=7) aerobic fitness groups. The physiological responses to a cold-pressor test and isometric handgrip exercise were measured at rest and during moderate- and heavy-intensity knee-extension (KE) exercise. Highly fit subjects had lower resting muscle sympathetic nerve activity (MSNA), but a larger MSNA response to physiological stress at rest. The cardiovascular response to stress at rest or during KE exercise was not altered by aerobic fitness. Heavy-intensity KE exercise attenuated leg vasoconstriction in response to physiological stress by a similar magnitude in all groups.
Language
English
DOI
doi:10.7939/R3XH3J
Rights
Permission is hereby granted to the University of Alberta Libraries to reproduce single copies of this thesis and to lend or sell such copies for private, scholarly or scientific research purposes only. Where the thesis is converted to, or otherwise made available in digital form, the University of Alberta will advise potential users of the thesis of these terms. The author reserves all other publication and other rights in association with the copyright in the thesis and, except as herein before provided, neither the thesis nor any substantial portion thereof may be printed or otherwise reproduced in any material form whatsoever without the author's prior written permission.
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File format: pdf (Portable Document Format)
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File size: 1597254
Last modified: 2015:10:12 13:20:02-06:00
Filename: Raymond_Duncan_Fall 2012.pdf
Original checksum: 5a7baca0406fb98ebc8d4eca5cdd32b7
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Status message: File header gives version as 1.4, but catalog dictionary gives version as 1.3
File title: DR Thesis_Final
File author: Duncan Raymond
Page count: 126
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