Both last authors.
Ventilatory response to exercise does not evidence electroencephalographical respiratory-related activation of the cortical premotor circuitry in healthy humans
Article first published online: 19 MAR 2012
© 2012 The Authors Acta Physiologica © 2012 Scandinavian Physiological Society
Volume 205, Issue 3, pages 356–362, July 2012
How to Cite
Jutand, L., Tremoureux, L., Pichon, A., Delpech, N., Denjean, A., Raux, M., Straus, C. and Similowski, T. (2012), Ventilatory response to exercise does not evidence electroencephalographical respiratory-related activation of the cortical premotor circuitry in healthy humans. Acta Physiologica, 205: 356–362. doi: 10.1111/j.1748-1716.2012.02427.x
- Issue published online: 18 MAY 2012
- Article first published online: 19 MAR 2012
- Accepted manuscript online: 22 FEB 2012 02:39PM EST
- Manuscript Accepted: 12 FEB 2012
- Manuscript Revised: 9 FEB 2012
- Manuscript Revised: 10 OCT 2011
- Manuscript Received: 18 AUG 2011
- Chancellerie de l'Université de Paris, Paris, France
- cerebral cortex;
- control of breathing;
The neural structures responsible for the coupling between ventilatory control and pulmonary gas exchange during exercise have not been fully identified. Suprapontine mechanisms have been hypothesized but not formally evidenced. Because the involvement of a premotor circuitry in the compensation of inspiratory mechanical loads has recently been described, we looked for its implication in exercise-induced hyperpnea.
Electroencephalographical recordings were performed to identify inspiratory premotor potentials (iPPM) in eight physically fit normal men during cycling at 40 and 70% of their maximal oxygen consumption (O2max). Relaxed pedalling (0 W) and voluntary sniff manoeuvres were used as negative and positive controls respectively.
Voluntary sniffs were consistently associated with iPPMs. This was also the case with voluntarily augmented breathing at rest (in three subjects tested). During the exercise protocol, no respiratory-related activity was observed whilst performing bouts of relaxed pedalling. Exercise-induced hyperpnea was also not associated with iPPMs, except in one subject.
We conclude that if there are cortical mechanisms involved in the ventilatory adaptation to exercise in physically fit humans, they are distinct from the premotor mechanisms activated by inspiratory load compensation.