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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 Imaging2002-01-01+01:00 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)
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author
organization
publishing date
type
Contribution to journal
publication status
published
subject
in
Clinical Physiology and Functional Imaging2002-01-01+01:00
volume
24
issue
5
pages
257 - 265
publisher
Wiley Online Library
external identifiers
  • wos:000224000700002
ISSN
1475-0961
DOI
10.1111/j.1475-097X.2004.00555.x
language
English
LU publication?
yes
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
2007-07-17 15:43:54
date last changed
2016-04-15 19:49:28
@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    = {Wiley Online Library},
  series       = {Clinical Physiology and Functional Imaging2002-01-01+01:00},
  title        = {Determination of both the time constant of vO and DeltavO/DeltaW from a single incremental exercise test: validation and repeatability.},
  url          = {http://dx.doi.org/10.1111/j.1475-097X.2004.00555.x},
  volume       = {24},
  year         = {2004},
}