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- Title
The impact of pedal rate on muscle oxygenation, muscle activation and whole-body VO during ramp exercise in healthy subjects.
- Authors
Boone, Jan; Barstow, Thomas; Celie, Bert; Prieur, Fabrice; Bourgois, Jan
- 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 VO, 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 VO (% VO) and analyzed with double-linear models. Results: The breakpoints (BP) of iEMG, MPF, total[Hb + Mb] and deoxy[Hb + Mb] in % VO 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) of total[Hb + Mb] (82.7 ± 1.5 % VO) was significantly lower ( P < 0.01) compared to the BP in iEMG (84.3 ± 1.7 % VO) and MPF (84.2 ± 1.6 % VO), whereas the BP in deoxy[Hb + Mb] (87.4 ± 1.4 % VO) and respiratory compensation point (89.9 ± 1.8 % VO) 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 VO rather than external WR, with a close interrelationship between that muscle activation, oxygenation and pulmonary VO.
- Subjects
OXYGENATION (Chemistry); EXERCISE physiology; EXERCISE intensity; PHYSICAL activity; MUSCLE strength
- Publication
European Journal of Applied Physiology, 2015, Vol 115, Issue 1, p57
- ISSN
1439-6319
- Publication type
Article
- DOI
10.1007/s00421-014-2991-x