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This work is licensed under a Creative Commons Attribution-NonCommercial 4.0 International License
Article
Reproducibility and Variability of the Conconi Test Analysis
Author(s)
M. Strupler1, G. Mueller2, A. Frotzler2 and C. Perret1
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DOI:10.17265/2332-7839/2018.03.005
Affiliation(s)
1. Institute of Sports Medicine, Swiss Paraplegic Centre, CH-6207 Nottwil, Switzerland
2. Clinical Trial Unit, Swiss Paraplegic Centre, CH-6207 Nottwil, Switzerland
ABSTRACT
The Conconi test
is an incremental exercise test characterised by stages of equal work. For analysis PO (power
output) and HR (heart rate) are used. The deflection point of the HR/PO graph
marks the point where the linear relation between PO and HR changes to a
curvilinear one. HR at deflection point correlates with the anaerobic
threshold. The objective of this study was to evaluate the reproducibility of
HR at deflection point of tests in cycling. In literature, only one
study with tests in running examined the reproducibility of the Conconi test.
Nineteen trained subjects performed 4 Conconi tests on an electronically
breaked cycle ergometer on different days. Finally, 68 graphs of the PO/HR
relationship were analysed by computer software as well as by three different
observers. HRs at deflection point of the 4 Conconi tests of every subject were
compared and coefficients of variation (CVs) were calculated. Mean CVs of HR at deflection point
per subject were 3.36% for the computer program and for the three observers
2.99%, 2.51% and 2.53%, respectively. CVs below 3.5% represent a good
reproducibility. The agreement between the three observers was statistically
good with an ICC (intraclass correlation coefficients) of 0.828. The mean range
of HR at deflection point per Conconi test comparing the three observers was
4.5 bpm corresponding 2.7% of HR at deflection point.
KEYWORDS
HR, deflection point, anaerobic threshold, visual analysis.
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