Determination of both the time constant of vO and DeltavO/DeltaW from a single incremental exercise test: validation and repeatability.
(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:
https://lup.lub.lu.se/record/127267
- author
- Wisén, Anita LU and Wohlfart, Björn LU
- organization
- publishing date
- 2004
- 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}}, }