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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)
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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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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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