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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 (2012) EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY. 112(3). p.1143-1152
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.
Please use this url to cite or link to this publication:
author
organization
year
type
journalArticle (original)
publication status
published
subject
keyword
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
journal title
EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY
Eur. J. Appl. Physiol.
volume
112
issue
3
pages
1143 - 1152
Web of Science type
Article
Web of Science id
000301567900034
JCR category
SPORT SCIENCES
JCR impact factor
2.66 (2012)
JCR rank
12/84 (2012)
JCR quartile
1 (2012)
ISSN
1439-6319
DOI
10.1007/s00421-011-2068-z
language
English
UGent publication?
yes
classification
A1
copyright statement
I have transferred the copyright for this publication to the publisher
id
2658706
handle
http://hdl.handle.net/1854/LU-2658706
date created
2012-06-18 13:59:23
date last changed
2015-06-17 10:07:06
@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},
  keyword      = {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},
}

Chicago
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.
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.
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.
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.