Original scientific paper
Intrarater reliability and agreement of the physioflow bioimpedance cardiography device during rest, moderate and high-intensity exercise
Nicole Gordon
; School of Psychology and Exercise Science, Murdoch University, 90 South Street, Murdoch, Western Australia, 6150, AUS
Chris R. Abbiss
; Centre for Exercise and Sport Science Research; School of Medical and Health Sciences, Edith Cowan University, 270 Joondalup Drive, Joondalup, Western Australia, 6027, AUS
Andrew J. Maiorana
; School of Physiotherapy and Exercise Science, Curtin University, Kent Street, Bentley, Western Australia, 6102, AUS
Kieran J. Marston
; School of Psychology and Exercise Science, Murdoch University, 90 South Street, Murdoch, Western Australia, 6150, AUS
Jeremiah J. Peiffer
; School of Psychology and Exercise Science, Murdoch University, 90 South Street, Murdoch, Western Australia, 6150, AUS
Abstract
The PhysioFlow bioimpedance cardiography device provides key measures of central systolic and diastolic and peripheral vascular function. Many of these variables have not been assessed for intrarater reliability and agreement during rest, submaximal exercise and high-intensity interval exercise. Twenty healthy adults (age: 26±4 years) completed two identical trials beginning with five minutes of rest followed by two 5-minute submaximal cycling bouts at 50% and 70% of peak power output. Subjects then completed ten 30-second cycling intervals at 90% of peak power output interspersed with 60 s of passive recovery. Bioimpedance cardiography (PhysioFlow; Manatec Biomedical, France) monitored heart rate, stroke volume, cardiac output, stroke volume index, cardiac index, ventricular ejection time, contractility index, ejection fraction, left cardiac work index, end diastolic volume, early diastolic filling ratio, systemic vascular resistance and systemic vascular resistance index continuously throughout both trials. Intraclass correlation coefficients (ICC), standard errors of measurement and minimal detectable differences were calculated for all variables. Heart rate, stroke volume, cardiac output, left cardiac work index and end diastolic volume demonstrated a
good level of reliability (ICC>.75) at rest, during submaximal exercise and high-intensity interval exercise. All other variables demonstrated inconsistent reliability across activity types and intensities. When using
the PhysioFlow device, heart rate, stroke volume, cardiac output, left cardiac work index and end diastolic volume were deemed acceptable for use regardless of exercise type (continuous vs. interval) or intensity (low, moderate, or high). However, other variables measured by this device appear less reliable.
Keywords
bioimpedance cardiography; exercise; reliability; high-intensity interval exercise; cardiac output; minimal detectable differences; central haemodynamics; peripheral haemodynamics
Hrčak ID:
192630
URI
Publication date:
31.3.2018.
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