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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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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.
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.
Chicago author-date
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.
Chicago author-date (all authors)
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.
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.
IEEE
[1]
J. Boone, T. J. Barstow, B. Celie, F. Prieur, and J. Bourgois, “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, vol. 115, no. 1, pp. 57–70, 2015.
@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 > 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.},
  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},
  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},
  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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