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The interrelationship between muscle oxygenation, muscle activation, and pulmonary oxygen uptake to incremental ramp exercise : influence of aerobic fitness

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Abstract
We investigated whether muscle and ventilatory responses to incremental ramp exercise would be influenced by aerobic fitness status by means of a cross-sectional study with a large subject population. Sixty-four male students (age: 21.2 ± 3.2 years) with a heterogeneous peak oxygen uptake (51.9 ± 6.3 mL·min(-1)·kg(-1), range 39.7-66.2 mL·min(-1)·kg(-1)) performed an incremental ramp cycle test (20-35 W·min(-1)) to exhaustion. Breath-by-breath gas exchange was recorded, and muscle activation and oxygenation were measured with surface electromyography and near-infrared spectroscopy, respectively. The integrated electromyography (iEMG), mean power frequency (MPF), deoxygenated [hemoglobin and myoglobin] (deoxy[Hb+Mb]), and total[Hb+Mb] responses were set out as functions of work rate and fitted with a double linear function. The respiratory compensation point (RCP) was compared and correlated with the breakpoints (BPs) (as percentage of peak oxygen uptake) in muscle activation and oxygenation. The BP in total[Hb+Mb] (83.2% ± 3.0% peak oxygen uptake) preceded (P < 0.001) the BP in iEMG (86.7% ± 4.0% peak oxygen uptake) and MPF (86.3% ± 4.1% peak oxygen uptake), which in turn preceded (P < 0.01) the BP in deoxy[Hb+Mb] (88.2% ± 4.5% peak oxygen uptake) and RCP (87.4% ± 4.5% peak oxygen uptake). Furthermore, the peak oxygen uptake was significantly (P < 0.001) positively correlated to the BPs and RCP, indicating that the BPs in total[Hb+Mb] (r = 0.66; P < 0.001), deoxy[Hb+Mb] (r = 0.76; P < 0.001), iEMG (r = 0.61; P < 0.001), MPF (r = 0.63; P < 0.001), and RCP (r = 0.75; P < 0.001) occurred at a higher percentage of peak oxygen uptake in subjects with a higher peak oxygen uptake. In this study a close relationship between muscle oxygenation, activation, and pulmonary oxygen uptake was found, occurring in a cascade of events. In subjects with a higher aerobic fitness level this cascade occurred at a higher relative intensity.
Keywords
pulmonary V̇O2, respiratory compensation point, puissance critique, point de compensation respiratoire, oxygénation musculaire, muscle oxygenation, muscle activation, critical power, activation musculaire, V̇O2peak, V̇O2 de crête, V̇O2 pulmonaire, NEAR-INFRARED SPECTROSCOPY, DIFFERENT FIBER TYPES, BLOOD-FLOW, NEUROMUSCULAR FATIGUE, VENTILATORY THRESHOLD, CYCLING EXERCISE, SKELETAL-MUSCLE, UPTAKE KINETICS, O-2 EXTRACTION, HEALTHY-ADULTS

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MLA
Boone, Jan et al. “The Interrelationship Between Muscle Oxygenation, Muscle Activation, and Pulmonary Oxygen Uptake to Incremental Ramp Exercise : Influence of Aerobic Fitness.” APPLIED PHYSIOLOGY NUTRITION AND METABOLISM 41.1 (2016): 55–62. Print.
APA
Boone, J., Barstow, T. J., Celie, B., Prieur, F., & Bourgois, J. (2016). The interrelationship between muscle oxygenation, muscle activation, and pulmonary oxygen uptake to incremental ramp exercise : influence of aerobic fitness. APPLIED PHYSIOLOGY NUTRITION AND METABOLISM, 41(1), 55–62.
Chicago author-date
Boone, Jan, Thomas J Barstow, Bert Celie, Fabrice Prieur, and Jan Bourgois. 2016. “The Interrelationship Between Muscle Oxygenation, Muscle Activation, and Pulmonary Oxygen Uptake to Incremental Ramp Exercise : Influence of Aerobic Fitness.” Applied Physiology Nutrition and Metabolism 41 (1): 55–62.
Chicago author-date (all authors)
Boone, Jan, Thomas J Barstow, Bert Celie, Fabrice Prieur, and Jan Bourgois. 2016. “The Interrelationship Between Muscle Oxygenation, Muscle Activation, and Pulmonary Oxygen Uptake to Incremental Ramp Exercise : Influence of Aerobic Fitness.” Applied Physiology Nutrition and Metabolism 41 (1): 55–62.
Vancouver
1.
Boone J, Barstow TJ, Celie B, Prieur F, Bourgois J. The interrelationship between muscle oxygenation, muscle activation, and pulmonary oxygen uptake to incremental ramp exercise : influence of aerobic fitness. APPLIED PHYSIOLOGY NUTRITION AND METABOLISM. 2016;41(1):55–62.
IEEE
[1]
J. Boone, T. J. Barstow, B. Celie, F. Prieur, and J. Bourgois, “The interrelationship between muscle oxygenation, muscle activation, and pulmonary oxygen uptake to incremental ramp exercise : influence of aerobic fitness,” APPLIED PHYSIOLOGY NUTRITION AND METABOLISM, vol. 41, no. 1, pp. 55–62, 2016.
@article{7088070,
  abstract     = {We investigated whether muscle and ventilatory responses to incremental ramp exercise would be influenced by aerobic fitness status by means of a cross-sectional study with a large subject population. Sixty-four male students (age: 21.2 ± 3.2 years) with a heterogeneous peak oxygen uptake (51.9 ± 6.3 mL·min(-1)·kg(-1), range 39.7-66.2 mL·min(-1)·kg(-1)) performed an incremental ramp cycle test (20-35 W·min(-1)) to exhaustion. Breath-by-breath gas exchange was recorded, and muscle activation and oxygenation were measured with surface electromyography and near-infrared spectroscopy, respectively. The integrated electromyography (iEMG), mean power frequency (MPF), deoxygenated [hemoglobin and myoglobin] (deoxy[Hb+Mb]), and total[Hb+Mb] responses were set out as functions of work rate and fitted with a double linear function. The respiratory compensation point (RCP) was compared and correlated with the breakpoints (BPs) (as percentage of peak oxygen uptake) in muscle activation and oxygenation. The BP in total[Hb+Mb] (83.2% ± 3.0% peak oxygen uptake) preceded (P < 0.001) the BP in iEMG (86.7% ± 4.0% peak oxygen uptake) and MPF (86.3% ± 4.1% peak oxygen uptake), which in turn preceded (P < 0.01) the BP in deoxy[Hb+Mb] (88.2% ± 4.5% peak oxygen uptake) and RCP (87.4% ± 4.5% peak oxygen uptake). Furthermore, the peak oxygen uptake was significantly (P < 0.001) positively correlated to the BPs and RCP, indicating that the BPs in total[Hb+Mb] (r = 0.66; P < 0.001), deoxy[Hb+Mb] (r = 0.76; P < 0.001), iEMG (r = 0.61; P < 0.001), MPF (r = 0.63; P < 0.001), and RCP (r = 0.75; P < 0.001) occurred at a higher percentage of peak oxygen uptake in subjects with a higher peak oxygen uptake. In this study a close relationship between muscle oxygenation, activation, and pulmonary oxygen uptake was found, occurring in a cascade of events. In subjects with a higher aerobic fitness level this cascade occurred at a higher relative intensity.},
  author       = {Boone, Jan and Barstow, Thomas J and Celie, Bert and Prieur, Fabrice and Bourgois, Jan},
  issn         = {1715-5312},
  journal      = {APPLIED PHYSIOLOGY NUTRITION AND METABOLISM},
  keywords     = {pulmonary V̇O2,respiratory compensation point,puissance critique,point de compensation respiratoire,oxygénation musculaire,muscle oxygenation,muscle activation,critical power,activation musculaire,V̇O2peak,V̇O2 de crête,V̇O2 pulmonaire,NEAR-INFRARED SPECTROSCOPY,DIFFERENT FIBER TYPES,BLOOD-FLOW,NEUROMUSCULAR FATIGUE,VENTILATORY THRESHOLD,CYCLING EXERCISE,SKELETAL-MUSCLE,UPTAKE KINETICS,O-2 EXTRACTION,HEALTHY-ADULTS},
  language     = {eng},
  number       = {1},
  pages        = {55--62},
  title        = {The interrelationship between muscle oxygenation, muscle activation, and pulmonary oxygen uptake to incremental ramp exercise : influence of aerobic fitness},
  url          = {http://dx.doi.org/10.1139/apnm-2015-0261},
  volume       = {41},
  year         = {2016},
}

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