
Pattern of deoxy[Hb+Mb] during ramp cycle exercise: influence of aerobic fitness status
- Author
- Jan Boone (UGent) , Katrien Koppo (UGent) , Thomas J Barstow and Jacques Bouckaert (UGent)
- Organization
- 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.
- Keywords
- 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
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Citation
Please use this url to cite or link to this publication: http://hdl.handle.net/1854/LU-663446
- MLA
- Boone, Jan, et al. “Pattern of Deoxy[Hb+Mb] during Ramp Cycle Exercise: Influence of Aerobic Fitness Status.” EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY, vol. 105, no. 6, 2009, pp. 851–59, doi:10.1007/s00421-008-0969-2.
- APA
- Boone, J., 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. https://doi.org/10.1007/s00421-008-0969-2
- Chicago author-date
- 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): 851–59. https://doi.org/10.1007/s00421-008-0969-2.
- Chicago author-date (all authors)
- 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. doi:10.1007/s00421-008-0969-2.
- 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.
- IEEE
- [1]J. Boone, K. Koppo, T. J. Barstow, and J. Bouckaert, “Pattern of deoxy[Hb+Mb] during ramp cycle exercise: influence of aerobic fitness status,” EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY, vol. 105, no. 6, pp. 851–859, 2009.
@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}}, keywords = {{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://doi.org/10.1007/s00421-008-0969-2}}, volume = {{105}}, year = {{2009}}, }
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