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Determination of both the time constant of vO and DeltavO/DeltaW from a single incremental exercise test: validation and repeatability.

Wisén, Anita LU and Wohlfart, Björn LU (2004) In Clinical Physiology and Functional Imaging 24(5). p.257-265
Abstract
A single incremental cycle exercise test including a steady-state load, combined with respiratory gas exchange, was performed with the objective of determining the time constant (o2) and the amount of oxygen required at each load (o2/DeltaW) by using a novel equation. The protocol was validated using four exercise tests at different constant loads and conventionally fitted mono-exponential functions to determine o2, and interpolation of o2 versus load to determine o2/DeltaW. No significant differences were seen between the means of either o2 or o2/DeltaW determined with the two protocols. The correlation coefficient was 0·62 for

o2 and 0·48 for o2/DeltaW. The absolute differences (2 SD) were 11·6 s for o2 and 1·1 ml min-1 W-1 for... (More)
A single incremental cycle exercise test including a steady-state load, combined with respiratory gas exchange, was performed with the objective of determining the time constant (o2) and the amount of oxygen required at each load (o2/DeltaW) by using a novel equation. The protocol was validated using four exercise tests at different constant loads and conventionally fitted mono-exponential functions to determine o2, and interpolation of o2 versus load to determine o2/DeltaW. No significant differences were seen between the means of either o2 or o2/DeltaW determined with the two protocols. The correlation coefficient was 0·62 for

o2 and 0·48 for o2/DeltaW. The absolute differences (2 SD) were 11·6 s for o2 and 1·1 ml min-1 W-1 for o2/DeltaW. The equations were compared in the same steady-state test and good agreement of o2 was obtained (R = 0·99). The 5-6-week repeatability (incremental test) was evaluated. No statistical differences were seen between the mean of the repeated tests. The difference between the tests (2 SD) were 20 s for o2 and 1·2 ml min-1 W-1 for o2/DeltaW. In conclusion, o2 and o2/DeltaW can be determined from a single incremental test. The validation showed an acceptable agreement, although the variations in absolute values were not negligible. This could partly be explained by the natural day-to-day variation and fluctuations in incoming raw data. The test-retest variation in absolute values was considerable, which must be taken into account when using

o2 and o2/DeltaW for evaluation of aerobic function. (Less)
Please use this url to cite or link to this publication:
author
and
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Clinical Physiology and Functional Imaging
volume
24
issue
5
pages
257 - 265
publisher
John Wiley & Sons Inc.
external identifiers
  • wos:000224000700002
  • scopus:5444249756
ISSN
1475-0961
DOI
10.1111/j.1475-097X.2004.00555.x
language
English
LU publication?
yes
additional info
The information about affiliations in this record was updated in December 2015. The record was previously connected to the following departments: Division of Physiotherapy (Closed 2012) (013042000), Department of Clinical Physiology (Lund) (013013000)
id
445a54bc-3739-4941-8963-3341f25f4e51 (old id 127267)
alternative location
http://www.ncbi.nlm.nih.gov/sites/entrez?Db=pubmed&Cmd=ShowDetailView&TermToSearch=15383081&ordinalpos=2&itool=EntrezSystem2.PEntrez.Pubmed.Pubmed_ResultsPanel.Pubmed_RVDocSum
date added to LUP
2016-04-01 12:09:08
date last changed
2022-04-29 01:23:18
@article{445a54bc-3739-4941-8963-3341f25f4e51,
  abstract     = {{A single incremental cycle exercise test including a steady-state load, combined with respiratory gas exchange, was performed with the objective of determining the time constant (o2) and the amount of oxygen required at each load (o2/DeltaW) by using a novel equation. The protocol was validated using four exercise tests at different constant loads and conventionally fitted mono-exponential functions to determine o2, and interpolation of o2 versus load to determine o2/DeltaW. No significant differences were seen between the means of either o2 or o2/DeltaW determined with the two protocols. The correlation coefficient was 0·62 for<br/><br>
o2 and 0·48 for o2/DeltaW. The absolute differences (2 SD) were 11·6 s for o2 and 1·1 ml min-1 W-1 for o2/DeltaW. The equations were compared in the same steady-state test and good agreement of o2 was obtained (R = 0·99). The 5-6-week repeatability (incremental test) was evaluated. No statistical differences were seen between the mean of the repeated tests. The difference between the tests (2 SD) were 20 s for o2 and 1·2 ml min-1 W-1 for o2/DeltaW. In conclusion, o2 and o2/DeltaW can be determined from a single incremental test. The validation showed an acceptable agreement, although the variations in absolute values were not negligible. This could partly be explained by the natural day-to-day variation and fluctuations in incoming raw data. The test-retest variation in absolute values was considerable, which must be taken into account when using<br/><br>
o2 and o2/DeltaW for evaluation of aerobic function.}},
  author       = {{Wisén, Anita and Wohlfart, Björn}},
  issn         = {{1475-0961}},
  language     = {{eng}},
  number       = {{5}},
  pages        = {{257--265}},
  publisher    = {{John Wiley & Sons Inc.}},
  series       = {{Clinical Physiology and Functional Imaging}},
  title        = {{Determination of both the time constant of vO and DeltavO/DeltaW from a single incremental exercise test: validation and repeatability.}},
  url          = {{https://lup.lub.lu.se/search/files/2802964/624079.pdf}},
  doi          = {{10.1111/j.1475-097X.2004.00555.x}},
  volume       = {{24}},
  year         = {{2004}},
}