The role of haemodynamic stimulus in isometric exercise training: implications for cardiovascular adaptations

Smith, J. (2014) The role of haemodynamic stimulus in isometric exercise training: implications for cardiovascular adaptations. Ph.D. thesis, Canterbury Christ Church University.

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Abstract

The purpose of this thesis was to explore the role of exercise induced blood flow
haemodynamics in the cardiovascular adaptations associated with isometric exercise
training, with focus on resting blood pressure adjustment in normotensive participants.
Using a cross-sectional study, it was identified that significant relationships were
present between (i) blood flow, (ii) shear stress, and (iii) shear pattern responses
(measured in the femoral artery), during and immediately following isometric bilateral
leg extension exercise of increasing intensity. Based on these findings, it was feasible to
suggest that the haemodynamic response to high intensities of acute isometric exercise
might provide a physiological challenge to the cardiovascular system, that upon
repeated exposure via isometric exercise training, may induce cardiovascular adaptation
and resting blood pressure reductions. Subsequent to this, a randomised controlled trial
established that performing isometric exercise training to a ‘high haemodynamic
stimulus’ did not induce significantly greater adaptation in resting blood pressure than
when performing isometric exercise training to a ‘low haemodynamic stimulus’ or
control. When the training group (high and low combined) were compared to the
control, significant reductions in resting blood pressure were observed. Furthermore,
non-invasive cardiovascular variables that were considered as possible physiological
mechanisms for resting blood pressure adaptation following isometric exercise training
did not correlate with within group resting blood pressure changes. Whilst these
findings suggest that a haemodynamic challenge may not be the primary stimulus
responsible for inducing resting blood pressure adaptation following isometric exercise
training, these results do demonstrate the effectiveness of isometric exercise training for
potential health gains via reductions in resting blood pressure in normotensives.
Importantly, these findings have progressed the current understanding surrounding
isometric exercise training induced resting blood pressure reductions and will allow
future research to narrow their focus upon other physiological variables that may be the
stimuli for blood pressure adaptation.

Item Type: Thesis (Doctoral)
Subjects: G Geography. Anthropology. Recreation > GV Recreation Leisure > GV0558 Sports science
Divisions: pre Nov-2014 > Faculty of Social and Applied Sciences > Sport Science, Tourism and Leisure
Depositing User: Mr Andrew Hudson
Date Deposited: 22 Sep 2015 11:19
Last Modified: 21 Sep 2016 14:43
URI: https://create.canterbury.ac.uk/id/eprint/13758

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Last edited: 29/06/2016 12:23:00