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Effect of exercise protocol on deoxy[Hb+Mb]: incremental step versus ramp exercise

Jan Boone (UGent) , Katrien Koppo (UGent) , Thomas Barstow and Jacques Bouckaert (UGent)
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Abstract
Purpose: The aim of the present study was to investigate whether the sigmoid pattern of deoxy[Hb + Mb] during incremental exercise is specific to non-steady-state conditions. Methods: Ten highly trained cyclists performed an incremental step (40 W.3 min(-1)) and ramp (35 W.min(-1)) exercise. Deoxy[Hb + Mb] was measured at the distal and proximal sites of the musculus vastus lateralis throughout the exercises using near- infrared spectroscopy. Deoxy[Hb + Mb] was set out as a function of work rate (% peak power), and using curve-fitting techniques, the best-fitting model was determined. Results: These procedures showed that the sigmoid pattern also provided the best fit for the pattern of deoxy[ Hb + Mb] in the step exercise. Furthermore, it was observed that the sigmoid model was similar for the ramp (d = 6.9% T 1.1% and 6.9% +/- 1.4%.%(-1) peak power; c/d = 52.1% +/- 3.8% and 52.1% +/- 4.5% peak power, for the proximal and distal measurement sites, respectively) and the step exercise (d = 7.4% +/- 1.5% and 6.4% +/- 1.5%.%(-1) peak power; c/d = 52.3% +/- 6.0% and 52.5% +/- 4.2% peak power, for the proximal and distal measurement sites, respectively). The pattern of deoxy[Hb + Mb] was not influenced by measurement site. Conclusions: From the present study, it can be concluded that the sigmoid pattern of deoxy[Hb + Mb] during incremental exercise is not specific to non-steady-state conditions. It was hypothesized that this pattern is an expression of a nonlinear (Q) over dot(m)/(V) over dotO(2m) relationship, related to changes in muscle fiber-type recruitment.
Keywords
MUSCLE BLOOD FLOW, DEOXYGENATION, NIRS, SIGMOID MODEL, RAT MUSCLES, GAS-EXCHANGE, CARDIAC-OUTPUT, CYCLE ERGOMETRY, CARDIOVASCULAR-RESPONSES, MUSCLE BLOOD-FLOW, DIFFERENT FIBER TYPES, NEAR-INFRARED SPECTROSCOPY, PULMONARY O-2 UPTAKE

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Chicago
Boone, Jan, Katrien Koppo, Thomas Barstow, and Jacques Bouckaert. 2010. “Effect of Exercise Protocol on deoxy[Hb+Mb]: Incremental Step Versus Ramp Exercise.” Medicine and Science in Sports and Exercise 42 (5): 935–942.
APA
Boone, Jan, Koppo, K., Barstow, T., & Bouckaert, J. (2010). Effect of exercise protocol on deoxy[Hb+Mb]: incremental step versus ramp exercise. MEDICINE AND SCIENCE IN SPORTS AND EXERCISE, 42(5), 935–942.
Vancouver
1.
Boone J, Koppo K, Barstow T, Bouckaert J. Effect of exercise protocol on deoxy[Hb+Mb]: incremental step versus ramp exercise. MEDICINE AND SCIENCE IN SPORTS AND EXERCISE. 2010;42(5):935–42.
MLA
Boone, Jan, Katrien Koppo, Thomas Barstow, et al. “Effect of Exercise Protocol on deoxy[Hb+Mb]: Incremental Step Versus Ramp Exercise.” MEDICINE AND SCIENCE IN SPORTS AND EXERCISE 42.5 (2010): 935–942. Print.
@article{949394,
  abstract     = {Purpose: The aim of the present study was to investigate whether the sigmoid pattern of deoxy[Hb + Mb] during incremental exercise is specific to non-steady-state conditions. Methods: Ten highly trained cyclists performed an incremental step (40 W.3 min(-1)) and ramp (35 W.min(-1)) exercise. Deoxy[Hb + Mb] was measured at the distal and proximal sites of the musculus vastus lateralis throughout the exercises using near- infrared spectroscopy. Deoxy[Hb + Mb] was set out as a function of work rate (\% peak power), and using curve-fitting techniques, the best-fitting model was determined. Results: These procedures showed that the sigmoid pattern also provided the best fit for the pattern of deoxy[ Hb + Mb] in the step exercise. Furthermore, it was observed that the sigmoid model was similar for the ramp (d = 6.9\% T 1.1\% and 6.9\% +/- 1.4\%.\%(-1) peak power; c/d = 52.1\% +/- 3.8\% and 52.1\% +/- 4.5\% peak power, for the proximal and distal measurement sites, respectively) and the step exercise (d = 7.4\% +/- 1.5\% and 6.4\% +/- 1.5\%.\%(-1) peak power; c/d = 52.3\% +/- 6.0\% and 52.5\% +/- 4.2\% peak power, for the proximal and distal measurement sites, respectively). The pattern of deoxy[Hb + Mb] was not influenced by measurement site. Conclusions: From the present study, it can be concluded that the sigmoid pattern of deoxy[Hb + Mb] during incremental exercise is not specific to non-steady-state conditions. It was hypothesized that this pattern is an expression of a nonlinear (Q) over dot(m)/(V) over dotO(2m) relationship, related to changes in muscle fiber-type recruitment.},
  author       = {Boone, Jan and Koppo, Katrien and Barstow, Thomas and Bouckaert, Jacques},
  issn         = {0195-9131},
  journal      = {MEDICINE AND SCIENCE IN SPORTS AND EXERCISE},
  keyword      = {MUSCLE BLOOD FLOW,DEOXYGENATION,NIRS,SIGMOID MODEL,RAT MUSCLES,GAS-EXCHANGE,CARDIAC-OUTPUT,CYCLE ERGOMETRY,CARDIOVASCULAR-RESPONSES,MUSCLE BLOOD-FLOW,DIFFERENT FIBER TYPES,NEAR-INFRARED SPECTROSCOPY,PULMONARY O-2 UPTAKE},
  language     = {eng},
  number       = {5},
  pages        = {935--942},
  title        = {Effect of exercise protocol on deoxy[Hb+Mb]: incremental step versus ramp exercise},
  url          = {http://dx.doi.org/10.1249/MSS.0b013e3181c0ecea},
  volume       = {42},
  year         = {2010},
}

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