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The impact of pedal rate on muscle oxygenation, muscle activation and whole-body VO2 during ramp exercise in healthy subjects

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Abstract
The aim of this project was to study the impact of pedal rate on breakpoints in muscle oxygenation (deoxy[Hb + Mb] and total[Hb + Mb]) and activation (iEMG and MPF) at high intensities during ramp exercise. Twelve physically active students performed incremental ramp exercises at 60 rpm, starting either at 50 or 80 W (i.e., 60rpm50 and 60rpm80), and at 100 rpm, starting at 50 W (100rpm50). Pulmonary VO2, muscle activation (iEMG and MPF) and oxygenation were recorded with EMG and NIRS, respectively. IEMG, MPF, deoxy[Hb + Mb] and total[Hb + Mb] were expressed as functions of work rate (WR) and pulmonary VO2 (%VO2peak) and analyzed with double-linear models. The breakpoints (BP) of iEMG, MPF, total[Hb + Mb] and deoxy[Hb + Mb] in %VO2peak did not differ among the pedal rate conditions (P > 0.05), whereas the BPs in WR were significantly lower in 100rpm50 compared to 60rpm50 and 60rpm80 (P < 0.01). Across the pedal rate conditions the BP (in %VO2peak) of total[Hb + Mb] (82.7 +/- A 1.5 %VO2peak) was significantly lower (P < 0.01) compared to the BP in iEMG (84.3 +/- A 1.7 %VO2peak) and MPF (84.2 +/- A 1.6 %VO2peak), whereas the BP in deoxy[Hb + Mb] (87.4 +/- A 1.4 %VO2peak) and respiratory compensation point (89.9 +/- A 1.8 %VO2peak) were significantly higher (P < 0.01) compared to the BP in total[Hb + Mb], iEMG and MPF. Additionally, the BPs in iEMG, MPF, total[Hb + Mb] and deoxy[Hb + Mb], and the RCP were highly correlated (r > 0.90; P < 0.001). The present study showed that muscle activation and oxygenation at high intensities during incremental exercise are related to pulmonary VO2 rather than external WR, with a close interrelationship between that muscle activation, oxygenation and pulmonary VO2.
Keywords
Muscle activation, CRITICAL POWER, Muscle oxygenation, Whole-body VO2, Pedal frequency, Incremental exercise, MICROVASCULAR O-2 EXTRACTION, NEAR-INFRARED SPECTROSCOPY, BLOOD-FLOW, CYCLE EXERCISE, INCREMENTAL CYCLE, CONTRACTION FREQUENCY, GAS-EXCHANGE, DEOXYGENATION, QUADRICEPS

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Chicago
Boone, Jan, Thomas J Barstow, Bert Celie, Fabrice Prieur, and Jan Bourgois. 2015. “The Impact of Pedal Rate on Muscle Oxygenation, Muscle Activation and Whole-body VO2 During Ramp Exercise in Healthy Subjects.” European Journal of Applied Physiology 115 (1): 57–70.
APA
Boone, Jan, Barstow, T. J., Celie, B., Prieur, F., & Bourgois, J. (2015). The impact of pedal rate on muscle oxygenation, muscle activation and whole-body VO2 during ramp exercise in healthy subjects. EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY, 115(1), 57–70.
Vancouver
1.
Boone J, Barstow TJ, Celie B, Prieur F, Bourgois J. The impact of pedal rate on muscle oxygenation, muscle activation and whole-body VO2 during ramp exercise in healthy subjects. EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY. 2015;115(1):57–70.
MLA
Boone, Jan, Thomas J Barstow, Bert Celie, et al. “The Impact of Pedal Rate on Muscle Oxygenation, Muscle Activation and Whole-body VO2 During Ramp Exercise in Healthy Subjects.” EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY 115.1 (2015): 57–70. Print.
@article{5702915,
  abstract     = {The aim of this project was to study the impact of pedal rate on breakpoints in muscle oxygenation (deoxy[Hb + Mb] and total[Hb + Mb]) and activation (iEMG and MPF) at high intensities during ramp exercise. 
Twelve physically active students performed incremental ramp exercises at 60 rpm, starting either at 50 or 80 W (i.e., 60rpm50 and 60rpm80), and at 100 rpm, starting at 50 W (100rpm50). Pulmonary VO2, muscle activation (iEMG and MPF) and oxygenation were recorded with EMG and NIRS, respectively. IEMG, MPF, deoxy[Hb + Mb] and total[Hb + Mb] were expressed as functions of work rate (WR) and pulmonary VO2 (\%VO2peak) and analyzed with double-linear models. 
The breakpoints (BP) of iEMG, MPF, total[Hb + Mb] and deoxy[Hb + Mb] in \%VO2peak did not differ among the pedal rate conditions (P {\textrangle} 0.05), whereas the BPs in WR were significantly lower in 100rpm50 compared to 60rpm50 and 60rpm80 (P {\textlangle} 0.01). Across the pedal rate conditions the BP (in \%VO2peak) of total[Hb + Mb] (82.7 +/- A 1.5 \%VO2peak) was significantly lower (P {\textlangle} 0.01) compared to the BP in iEMG (84.3 +/- A 1.7 \%VO2peak) and MPF (84.2 +/- A 1.6 \%VO2peak), whereas the BP in deoxy[Hb + Mb] (87.4 +/- A 1.4 \%VO2peak) and respiratory compensation point (89.9 +/- A 1.8 \%VO2peak) were significantly higher (P {\textlangle} 0.01) compared to the BP in total[Hb + Mb], iEMG and MPF. Additionally, the BPs in iEMG, MPF, total[Hb + Mb] and deoxy[Hb + Mb], and the RCP were highly correlated (r {\textrangle} 0.90; P {\textlangle} 0.001). 
The present study showed that muscle activation and oxygenation at high intensities during incremental exercise are related to pulmonary VO2 rather than external WR, with a close interrelationship between that muscle activation, oxygenation and pulmonary VO2.},
  author       = {Boone, Jan and Barstow, Thomas J and Celie, Bert and Prieur, Fabrice and Bourgois, Jan},
  issn         = {1439-6319},
  journal      = {EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY},
  keyword      = {Muscle activation,CRITICAL POWER,Muscle oxygenation,Whole-body VO2,Pedal frequency,Incremental exercise,MICROVASCULAR O-2 EXTRACTION,NEAR-INFRARED SPECTROSCOPY,BLOOD-FLOW,CYCLE EXERCISE,INCREMENTAL CYCLE,CONTRACTION FREQUENCY,GAS-EXCHANGE,DEOXYGENATION,QUADRICEPS},
  language     = {eng},
  number       = {1},
  pages        = {57--70},
  title        = {The impact of pedal rate on muscle oxygenation, muscle activation and whole-body VO2 during ramp exercise in healthy subjects},
  url          = {http://dx.doi.org/10.1007/s00421-014-2991-x},
  volume       = {115},
  year         = {2015},
}

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