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European Journal of Applied Physiology

Erschienen in:

01.01.2015 | Original Article

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

verfasst von: Jan Boone, Thomas J. Barstow, Bert Celie, Fabrice Prieur, Jan Bourgois

Erschienen in: European Journal of Applied Physiology | Ausgabe 1/2015

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Abstract

Purpose

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.

Methods

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 (%VO_2peak) and analyzed with double-linear models.

Results

The breakpoints (BP) of iEMG, MPF, total[Hb + Mb] and deoxy[Hb + Mb] in %VO_2peak 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 %VO_2peak) of total[Hb + Mb] (82.7 ± 1.5 %VO_2peak) was significantly lower (P < 0.01) compared to the BP in iEMG (84.3 ± 1.7 %VO_2peak) and MPF (84.2 ± 1.6 %VO_2peak), whereas the BP in deoxy[Hb + Mb] (87.4 ± 1.4 %VO_2peak) and respiratory compensation point (89.9 ± 1.8 %VO_2peak) 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).

Conclusions

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.

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Titel: The impact of pedal rate on muscle oxygenation, muscle activation and whole-body VO2 during ramp exercise in healthy subjects
verfasst von: Jan Boone
Thomas J. Barstow
Bert Celie
Fabrice Prieur
Jan Bourgois
Publikationsdatum: 01.01.2015
Verlag: Springer Berlin Heidelberg
Erschienen in: European Journal of Applied Physiology / Ausgabe 1/2015
Print ISSN: 1439-6319
Elektronische ISSN: 1439-6327
DOI: https://doi.org/10.1007/s00421-014-2991-x

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Abstract

Purpose

Methods

Results

Conclusions

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