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Characterizing cerebral and locomotor muscle oxygenation to incremental ramp exercise in healthy children : relationship with pulmonary gas exchange

Kristof Vandekerckhove (UGent) , Ilse Coomans (UGent) , Anneliese Moerman (UGent) , Daniël De Wolf (UGent) and Jan Boone (UGent)
(2016) EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY. 116(11-12). p.2345-2355
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Abstract
AIMS: To characterize the oxygenation responses at cerebral and locomotor muscle level to incremental exercise in children and to assess the interrelationship with the pulmonary gas exchange responses. METHODS: Eighteen children (9 boys, 9 girls) (mean age 10.9 ± 1.0 years) performed incremental cycle ramp exercise to exhaustion. The concentration of cerebral and muscle oxygenated (O2Hb) and deoxygenated (HHb) hemoglobin (by means of near-infrared spectroscopy) and pulmonary gas exchange was recorded. Cerebral and muscle O2Hb and HHb values were expressed as functions of oxygen uptake (VO2) and breakpoints were detected by means of double linear model analysis. The respiratory compensation point (RCP) was determined. The breakpoints in cerebral and muscle O2Hb and HHb were compared and correlated to RCP. RESULTS: The subjects reached peak power output of 105 ± 18 W and VO2peak of 43.5 ± 7.0 ml min-1 kg-1. Cerebral O2Hb increased to an intensity of 89.4 ± 5.5 %VO2peak, where a breakpoint occurred at which cerebral O2Hb started to decrease. Cerebral HHb increased slightly to 88.1 ± 4.8 %VO2peak, at which the increase was accelerated. Muscle HHb increased to 90.5 ± 4.8 %VO2peak where a leveling-off occurred. RCP occurred at 89.3 ± 4.3 %VO2peak. The breakpoints and RCP did not differ significantly (P = 0.13) and were strongly correlated (r > 0.70, P < 0.05). There were no differences between boys and girls (P = 0.43) and there was no significant correlation with VO2peak (P > 0.05). CONCLUSIONS: It was shown that cerebral and muscle oxygenation responses undergo significant changes as work rate increases and show breakpoints in the ongoing response at high intensity (85-95 %VO2peak). These breakpoints are strongly interrelated and associated with changes in pulmonary gas exchange.
Keywords
Public Health, Environmental and Occupational Health, Physiology (medical), Orthopedics and Sports Medicine, NEAR-INFRARED SPECTROSCOPY, MODERATE-INTENSITY EXERCISE, DIFFERENT FIBER TYPES, O-2 EXTRACTION, SUSTAINABLE PERFORMANCE, PREPUBERTAL CHILDREN, CYCLING EXERCISE, MAXIMAL EXERCISE, VASTUS LATERALIS, AEROBIC FITNESS

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Chicago
Vandekerckhove, Kristof, Ilse Coomans, Anneliese Moerman, Daniël De Wolf, and Jan Boone. 2016. “Characterizing Cerebral and Locomotor Muscle Oxygenation to Incremental Ramp Exercise in Healthy Children : Relationship with Pulmonary Gas Exchange.” European Journal of Applied Physiology 116 (11-12): 2345–2355.
APA
Vandekerckhove, K., Coomans, I., Moerman, A., De Wolf, D., & Boone, J. (2016). Characterizing cerebral and locomotor muscle oxygenation to incremental ramp exercise in healthy children : relationship with pulmonary gas exchange. EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY, 116(11-12), 2345–2355.
Vancouver
1.
Vandekerckhove K, Coomans I, Moerman A, De Wolf D, Boone J. Characterizing cerebral and locomotor muscle oxygenation to incremental ramp exercise in healthy children : relationship with pulmonary gas exchange. EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY. 2016;116(11-12):2345–55.
MLA
Vandekerckhove, Kristof, Ilse Coomans, Anneliese Moerman, et al. “Characterizing Cerebral and Locomotor Muscle Oxygenation to Incremental Ramp Exercise in Healthy Children : Relationship with Pulmonary Gas Exchange.” EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY 116.11-12 (2016): 2345–2355. Print.
@article{8500077,
  abstract     = {AIMS: To characterize the oxygenation responses at cerebral and locomotor muscle level to incremental exercise in children and to assess the interrelationship with the pulmonary gas exchange responses.
METHODS: Eighteen children (9 boys, 9 girls) (mean age 10.9 {\textpm} 1.0 years) performed incremental cycle ramp exercise to exhaustion. The concentration of cerebral and muscle oxygenated (O2Hb) and deoxygenated (HHb) hemoglobin (by means of near-infrared spectroscopy) and pulmonary gas exchange was recorded. Cerebral and muscle O2Hb and HHb values were expressed as functions of oxygen uptake (VO2) and breakpoints were detected by means of double linear model analysis. The respiratory compensation point (RCP) was determined. The breakpoints in cerebral and muscle O2Hb and HHb were compared and correlated to RCP.
RESULTS: The subjects reached peak power output of 105 {\textpm} 18 W and VO2peak of 43.5 {\textpm} 7.0 ml min-1 kg-1. Cerebral O2Hb increased to an intensity of 89.4 {\textpm} 5.5 \%VO2peak, where a breakpoint occurred at which cerebral O2Hb started to decrease. Cerebral HHb increased slightly to 88.1 {\textpm} 4.8 \%VO2peak, at which the increase was accelerated. Muscle HHb increased to 90.5 {\textpm} 4.8 \%VO2peak where a leveling-off occurred. RCP occurred at 89.3 {\textpm} 4.3 \%VO2peak. The breakpoints and RCP did not differ significantly (P = 0.13) and were strongly correlated (r {\textrangle} 0.70, P {\textlangle} 0.05). There were no differences between boys and girls (P = 0.43) and there was no significant correlation with VO2peak (P {\textrangle} 0.05).
CONCLUSIONS: It was shown that cerebral and muscle oxygenation responses undergo significant changes as work rate increases and show breakpoints in the ongoing response at high intensity (85-95 \%VO2peak). These breakpoints are strongly interrelated and associated with changes in pulmonary gas exchange.},
  author       = {Vandekerckhove, Kristof and Coomans, Ilse and Moerman, Anneliese and De Wolf, Dani{\"e}l and Boone, Jan},
  issn         = {1439-6319},
  journal      = {EUROPEAN JOURNAL OF APPLIED PHYSIOLOGY},
  keyword      = {Public Health,Environmental and Occupational Health,Physiology (medical),Orthopedics and Sports Medicine,NEAR-INFRARED SPECTROSCOPY,MODERATE-INTENSITY EXERCISE,DIFFERENT FIBER TYPES,O-2 EXTRACTION,SUSTAINABLE PERFORMANCE,PREPUBERTAL CHILDREN,CYCLING EXERCISE,MAXIMAL EXERCISE,VASTUS LATERALIS,AEROBIC FITNESS},
  language     = {eng},
  number       = {11-12},
  pages        = {2345--2355},
  title        = {Characterizing cerebral and locomotor muscle oxygenation to incremental ramp exercise in healthy children : relationship with pulmonary gas exchange},
  url          = {http://dx.doi.org/10.1007/s00421-016-3486-8},
  volume       = {116},
  year         = {2016},
}

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