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Influence of priming exercise on muscle deoxy[Hb+Mb] during ramp cycle exercise

Jan Boone (UGent) , Jacques Bouckaert (UGent) , Thomas J Barstow and Jan Bourgois (UGent)
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Abstract
The aim of the present study was to gain better insight into the mechanisms underpinning the sigmoid pattern of deoxy[Hb + Mb] during incremental exercise by assessing the changes in the profile following prior high-intensity exercise. Ten physically active students performed two incremental ramp (25 W min(-1)) exercises (AL and LL, respectively) preceded on one occasion by incremental arm (10 W min(-1)) and on another occasion by incremental leg exercise (25 W min(-1)), which served as the reference test (RT). Deoxy[Hb + Mb] was measured by means of near-infrared spectroscopy and surface EMG was recorded at the Vastus Lateralis throughout the exercises. Deoxy[Hb + Mb], integrated EMG and Median Power Frequency (MdPF) were expressed as a function of work rate (W) and compared between the exercises. During RT and AL deoxy[Hb + Mb] followed a sigmoid increase as a function of work rate. However, during LL deoxy[Hb + Mb] increased immediately from the onset of the ramp exercise and thus no longer followed a sigmoid pattern. This different pattern in deoxy[Hb + Mb] was accompanied by a steeper slope of the iEMG/W-relationship below the GET (LL: 0.89 +/- 0.11% W-1; RT: 0.74 +/- 0.08% W-1; AL: 0.72 +/- 0.10% W-1) and a more pronounced decrease in MdPF in LL (17.2 +/- 4.5%) compared to RT (5.0 +/- 2.1%) and AL (3.9 +/- 3.2%). It was observed that the sigmoid pattern of deoxy[Hb + Mb] was disturbed when the ramp exercise was preceded by priming leg exercise. Since the differences in deoxy[Hb + Mb] were accompanied by differences in EMG it can be suggested that muscle fibre recruitment is an important underlying mechanism for the pattern of deoxy[Hb + Mb] during ramp exercise.
Keywords
RAT MUSCLES, GAS-EXCHANGE, PRIOR HEAVY EXERCISE, BLOOD-FLOW, UPTAKE KINETICS, SLOW-TWITCH, EMG FREQUENCY-SPECTRUM, DIFFERENT FIBER TYPES, Bohr effect, NEAR-INFRARED SPECTROSCOPY, PULMONARY O-2 UPTAKE, Muscle fibre recruitment, NIRS, Sigmoid pattern

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MLA
Boone, Jan, Jacques Bouckaert, Thomas J Barstow, et al. “Influence of Priming Exercise on Muscle deoxy[Hb+Mb] During Ramp Cycle Exercise.” EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY 112.3 (2012): 1143–1152. Print.
APA
Boone, Jan, Bouckaert, J., Barstow, T. J., & Bourgois, J. (2012). Influence of priming exercise on muscle deoxy[Hb+Mb] during ramp cycle exercise. EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY, 112(3), 1143–1152.
Chicago author-date
Boone, Jan, Jacques Bouckaert, Thomas J Barstow, and Jan Bourgois. 2012. “Influence of Priming Exercise on Muscle deoxy[Hb+Mb] During Ramp Cycle Exercise.” European Journal of Applied Physiology 112 (3): 1143–1152.
Chicago author-date (all authors)
Boone, Jan, Jacques Bouckaert, Thomas J Barstow, and Jan Bourgois. 2012. “Influence of Priming Exercise on Muscle deoxy[Hb+Mb] During Ramp Cycle Exercise.” European Journal of Applied Physiology 112 (3): 1143–1152.
Vancouver
1.
Boone J, Bouckaert J, Barstow TJ, Bourgois J. Influence of priming exercise on muscle deoxy[Hb+Mb] during ramp cycle exercise. EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY. 2012;112(3):1143–52.
IEEE
[1]
J. Boone, J. Bouckaert, T. J. Barstow, and J. Bourgois, “Influence of priming exercise on muscle deoxy[Hb+Mb] during ramp cycle exercise,” EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY, vol. 112, no. 3, pp. 1143–1152, 2012.
@article{2658706,
  abstract     = {The aim of the present study was to gain better insight into the mechanisms underpinning the sigmoid pattern of deoxy[Hb + Mb] during incremental exercise by assessing the changes in the profile following prior high-intensity exercise. Ten physically active students performed two incremental ramp (25 W min(-1)) exercises (AL and LL, respectively) preceded on one occasion by incremental arm (10 W min(-1)) and on another occasion by incremental leg exercise (25 W min(-1)), which served as the reference test (RT). Deoxy[Hb + Mb] was measured by means of near-infrared spectroscopy and surface EMG was recorded at the Vastus Lateralis throughout the exercises. Deoxy[Hb + Mb], integrated EMG and Median Power Frequency (MdPF) were expressed as a function of work rate (W) and compared between the exercises. During RT and AL deoxy[Hb + Mb] followed a sigmoid increase as a function of work rate. However, during LL deoxy[Hb + Mb] increased immediately from the onset of the ramp exercise and thus no longer followed a sigmoid pattern. This different pattern in deoxy[Hb + Mb] was accompanied by a steeper slope of the iEMG/W-relationship below the GET (LL: 0.89 +/- 0.11% W-1; RT: 0.74 +/- 0.08% W-1; AL: 0.72 +/- 0.10% W-1) and a more pronounced decrease in MdPF in LL (17.2 +/- 4.5%) compared to RT (5.0 +/- 2.1%) and AL (3.9 +/- 3.2%). It was observed that the sigmoid pattern of deoxy[Hb + Mb] was disturbed when the ramp exercise was preceded by priming leg exercise. Since the differences in deoxy[Hb + Mb] were accompanied by differences in EMG it can be suggested that muscle fibre recruitment is an important underlying mechanism for the pattern of deoxy[Hb + Mb] during ramp exercise.},
  author       = {Boone, Jan and Bouckaert, Jacques and Barstow, Thomas J and Bourgois, Jan},
  issn         = {1439-6319},
  journal      = {EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY},
  keywords     = {RAT MUSCLES,GAS-EXCHANGE,PRIOR HEAVY EXERCISE,BLOOD-FLOW,UPTAKE KINETICS,SLOW-TWITCH,EMG FREQUENCY-SPECTRUM,DIFFERENT FIBER TYPES,Bohr effect,NEAR-INFRARED SPECTROSCOPY,PULMONARY O-2 UPTAKE,Muscle fibre recruitment,NIRS,Sigmoid pattern},
  language     = {eng},
  number       = {3},
  pages        = {1143--1152},
  title        = {Influence of priming exercise on muscle deoxy[Hb+Mb] during ramp cycle exercise},
  url          = {http://dx.doi.org/10.1007/s00421-011-2068-z},
  volume       = {112},
  year         = {2012},
}

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