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Title of Journal: Eur J Appl Physiol

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Abbravation: European Journal of Applied Physiology

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Springer Berlin Heidelberg

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DOI

10.1002/andp.201400805

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ISSN

1439-6327

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Characterizing cerebral and locomotor muscle oxyge

Authors: Kristof Vandekerckhove Ilse Coomans Annelies Moerman Daniel De Wolf Jan Boone
Publish Date: 2016/10/06
Volume: 116, Issue: 11-12, Pages: 2345-2355
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Abstract

Eighteen children 9 boys 9 girls mean age 109 ± 10 years performed incremental cycle ramp exercise to exhaustion The concentration of cerebral and muscle oxygenated O2Hb and deoxygenated HHb hemoglobin by means of nearinfrared 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 RCPThe subjects reached peak power output of 105 ± 18 W and VO2peak of 435 ± 70 ml min−1 kg−1 Cerebral O2Hb increased to an intensity of 894 ± 55 VO2peak where a breakpoint occurred at which cerebral O2Hb started to decrease Cerebral HHb increased slightly to 881 ± 48 VO2peak at which the increase was accelerated Muscle HHb increased to 905 ± 48 VO2peak where a levelingoff occurred RCP occurred at 893 ± 43 VO2peak The breakpoints and RCP did not differ significantly P = 013 and were strongly correlated r  070 P  005 There were no differences between boys and girls P = 043 and there was no significant correlation with VO2peak P  005It 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

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