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Pattern of deoxy[Hb+Mb] during ramp cycle exercise: influence of aerobic fitness status

Jan Boone UGent, Katrien Koppo UGent, Thomas J Barstow and Jacques Bouckaert UGent (2009) EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY. 105(6). p.851-859
abstract
During ramp exercise the deoxy[Hb + Mb] pattern follows a sigmoid model [f(x) = f(0) + A/(1 + exp(-(-c + dx)))], indicating a non-linear muscle blood flow ((Q) over dotm/oxygen uptake ((V) over dotO(2m))-relationship. We hypothesised that in trained cyclists the sigmoid would display a rightward shift, due to an increased oxidative capacity and/or higher percentage of slow-twitch fibres. A total of 10 cyclists and 11 physically active students (PA students) performed a relative ramp exercise (+/- 12 min) and a ramp25-exercise (25 W min(-1)). Deoxy[Hb + Mb] was measured at the M. Vastus Lateralis by NIRS, normalized to the total amplitude of the response and expressed as a function of absolute and relative (% peakP) work rate. The work rate corresponding to c/d (i.e. 50% of the amplitude of the deoxy[Hb + Mb] response) was the only parameter of the sigmoid that differed significantly between cyclists (57.9 +/- 4.4% and 60.1 +/- 4.1% peakP in the relative and ramp25, respectively) and PAstudents (49.6 +/- 4.2% and 48.2 +/- 5.1% peakP, respectively), indicating a rightward shift of the sigmoid in the cyclists. These results suggest a change in the time course of C(a-v) O-2 as a function of aerobic fitness status.
Please use this url to cite or link to this publication:
author
organization
alternative title
Pattern of deoxy[Hb plus Mb] during ramp cycle exercise : influence of aerobic fitness status
year
type
journalArticle (original)
publication status
published
subject
keyword
NIRS, Deoxygenation, Muscle blood flow, Muscle oxygen uptake, Sigmoid model, DIFFERENT FIBER TYPES, BLOOD-FLOW KINETICS, PULMONARY O-2 UPTAKE, SKELETAL-MUSCLE, RAT MUSCLES, GAS-EXCHANGE, ONSET, DEOXYGENATION, EXTRACTION, HETEROGENEITY
journal title
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
Eur. J. Appl. Physiol.
volume
105
issue
6
pages
851 - 859
Web of Science type
Article
Web of Science id
000264175900004
JCR category
SPORT SCIENCES
JCR impact factor
2.047 (2009)
JCR rank
16/72 (2009)
JCR quartile
1 (2009)
ISSN
1439-6319
DOI
10.1007/s00421-008-0969-2
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
663446
handle
http://hdl.handle.net/1854/LU-663446
date created
2009-05-22 12:37:10
date last changed
2015-06-17 11:12:30
@article{663446,
  abstract     = {During ramp exercise the deoxy[Hb + Mb] pattern follows a sigmoid model [f(x) = f(0) + A/(1 + exp(-(-c + dx)))], indicating a non-linear muscle blood flow ((Q) over dotm/oxygen uptake ((V) over dotO(2m))-relationship. We hypothesised that in trained cyclists the sigmoid would display a rightward shift, due to an increased oxidative capacity and/or higher percentage of slow-twitch fibres. A total of 10 cyclists and 11 physically active students (PA students) performed a relative ramp exercise (+/- 12 min) and a ramp25-exercise (25 W min(-1)). Deoxy[Hb + Mb] was measured at the M. Vastus Lateralis by NIRS, normalized to the total amplitude of the response and expressed as a function of absolute and relative (\% peakP) work rate. The work rate corresponding to c/d (i.e. 50\% of the amplitude of the deoxy[Hb + Mb] response) was the only parameter of the sigmoid that differed significantly between cyclists (57.9 +/- 4.4\% and 60.1 +/- 4.1\% peakP in the relative and ramp25, respectively) and PAstudents (49.6 +/- 4.2\% and 48.2 +/- 5.1\% peakP, respectively), indicating a rightward shift of the sigmoid in the cyclists. These results suggest a change in the time course of C(a-v) O-2 as a function of aerobic fitness status.},
  author       = {Boone, Jan and Koppo, Katrien and Barstow, Thomas J and Bouckaert, Jacques},
  issn         = {1439-6319},
  journal      = {EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY},
  keyword      = {NIRS,Deoxygenation,Muscle blood flow,Muscle oxygen uptake,Sigmoid model,DIFFERENT FIBER TYPES,BLOOD-FLOW KINETICS,PULMONARY O-2 UPTAKE,SKELETAL-MUSCLE,RAT MUSCLES,GAS-EXCHANGE,ONSET,DEOXYGENATION,EXTRACTION,HETEROGENEITY},
  language     = {eng},
  number       = {6},
  pages        = {851--859},
  title        = {Pattern of deoxy[Hb+Mb] during ramp cycle exercise: influence of aerobic fitness status},
  url          = {http://dx.doi.org/10.1007/s00421-008-0969-2},
  volume       = {105},
  year         = {2009},
}

Chicago
Boone, Jan, Katrien Koppo, Thomas J Barstow, and Jacques Bouckaert. 2009. “Pattern of deoxy[Hb+Mb] During Ramp Cycle Exercise: Influence of Aerobic Fitness Status.” European Journal of Applied Physiology 105 (6): 851–859.
APA
Boone, Jan, Koppo, K., Barstow, T. J., & Bouckaert, J. (2009). Pattern of deoxy[Hb+Mb] during ramp cycle exercise: influence of aerobic fitness status. EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY, 105(6), 851–859.
Vancouver
1.
Boone J, Koppo K, Barstow TJ, Bouckaert J. Pattern of deoxy[Hb+Mb] during ramp cycle exercise: influence of aerobic fitness status. EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY. 2009;105(6):851–9.
MLA
Boone, Jan, Katrien Koppo, Thomas J Barstow, et al. “Pattern of deoxy[Hb+Mb] During Ramp Cycle Exercise: Influence of Aerobic Fitness Status.” EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY 105.6 (2009): 851–859. Print.