Preferred Name

Daniel S. Valcicak

Creative Commons License

Creative Commons License
This work is licensed under a Creative Commons Attribution-Noncommercial-No Derivative Works 4.0 License.

ORCID

http://orcid.org/0000-0002-3183-6260

Date of Graduation

Spring 2017

Document Type

Thesis

Degree Name

Master of Science (MS)

Department

Department of Kinesiology

Advisor(s)

Trent Alan Hargens

Michael J. Saunders

Christopher J. Womack

Abstract

Impedance cardiography (IC) measures cardiovascular hemodynamics non-invasively during exercise. However, IC measurements assessing physiological differences across treadmill (TM) and cycle (CYC) exercise has not been investigated. The purpose of this study is to investigate whether hemodynamic measurements assessed via IC are consistent between TM and CYC exercise at two absolute exercise intensities. Twenty-one men (age = 21.4 ± 0.5 y; BMI = 24.4 ± 0.5) completed four exercise tests, two TM and two CYC. Within each test, two, five-minute, steady-state stages were completed with targeted intensities of 5 (MODex) and 7 (VIGex) metabolic equivalents (METs). Oxygen consumption (VO2) was measured by indirect calorimetry. Hemodynamic measures were obtained via IC (PhysioFlow, PF07 Enduro) and included cardiac output (CO), heart rate (HR), stroke volume (SV), end diastolic volume (EDV), ejection fraction (EF), systemic vascular resistance (SVR), contractility index (CTi), and left cardiac work index (LCWi). Within treadmill exercise, there were no main effects for trial, except for HR. There were no main effects for trial within CYC exercise. Across exercise modes, there were no significant differences between TM and CYC exercise for all variables, with the exception of higher HR in CYC, and higher SV and EDV in TM. ICCs were strong for all variables except VIGex SVR and VIGex LCWi. IC hemodynamic measurements showed strong repeatability across modes for all hemodynamic variables during MODex. For VIGex, all variables showed strong correlations, except for SVR and LCWi. Lack of agreement may be associated with daily variation in hemodynamics or physiological differences across modes with the remainder of discrepancies associated with device error.

Share

COinS
 
 

To view the content in your browser, please download Adobe Reader or, alternately,
you may Download the file to your hard drive.

NOTE: The latest versions of Adobe Reader do not support viewing PDF files within Firefox on Mac OS and if you are using a modern (Intel) Mac, there is no official plugin for viewing PDF files within the browser window.