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The effects of multi-stage exercise with and without concurrent cognitive performance on cardiorespiratory and cerebral haemodynamic responses

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European Journal of Applied Physiology Aims and scope Submit manuscript

Abstract

Introduction

Studies of cerebral haemodynamics have shown changes with increased exercise intensity, but the patterns have been highly variable and reliable associations with cognitive performance have not been identified. The aim of this study was to examine whether exercise-induced changes in oxygenated haemoglobin (O2Hb) led to changes in concomitant cognitive performance.

Methods

This study examined cardiorespiratory and cerebral haemodynamics during multi-stage exercise from rest to exhaustion, with (Ex + C) and without (Ex) concurrent cognitive performance (Go/No-go task).

Results

The presence of the cognitive task affected both cardiorespiratory and cerebral haemodynamics. The patterns in the cerebral haemodynamics during Ex and Ex + C diverged above the respiratory compensation threshold (RCT), but differences were significant only at 100% \(\dot {V}{{\text{O}}_{{\text{2max}}}}\), displaying increased deoxygenated haemoglobin (HHb), decreased difference between oxygenated and deoxygenated haemoglobin (HbDiff), and decreased cerebral oxygenation (COx) during Ex + C. More complex haemodynamic trends against intensity during Ex + C suggested that the presence of a cognitive task increases cerebral metabolic demand at high exercise intensities. The levels of O2Hb, HHb, HbDiff and total haemoglobin increased most steeply at intensities around the RCT during both Ex and Ex + C, but these changes were not accompanied by improved cognitive performance.

Conclusion

The primary hypothesis, that cognitive performance would match changes in O2Hb, was not supported. Small variations in reaction time and response accuracy across exercise intensities were not significant, suggesting that cognitive performance is unaffected by intense short-duration exercise. Our results add further evidence that exercise-induced changes in cerebral haemodynamics do not affect cognitive performance.

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Abbreviations

ANOVA:

Analysis of variance

COx:

Cerebral oxygenation

Ex:

Exercise only group

Ex + C:

Exercise and cognition group

HbDiff:

Difference between oxygenated and deoxygenated haemoglobin

HHb:

Deoxygenated haemoglobin

HR:

Heart rate

mL · kg−1 · min1 :

Millilitres per kilogram per minute

NIRS:

Near-infrared spectroscopy

O2Hb:

Oxygenated haemoglobin

PETCO2 :

Partial pressure of end-tidal carbon dioxide

POmax :

Maximal power output

RCT:

Respiratory compensation threshold

RR:

Respiratory rate

RT:

Reaction time

THb:

Total haemoglobin

\(\dot {V}{{\text{O}}_{{\text{2max}}}}\) :

Maximal rate of oxygen consumption

\(\dot {V}{{\text{O}}_2}\) :

Volume of oxygen consumption

\(\dot {V}{\text{C}}{{\text{O}}_2}\) :

Volume of carbon dioxide consumption

V t :

Tidal volume

VE:

Minute ventilation

\({\text{VE/}}\dot {V}{\text{C}}{{\text{O}}_2}\) :

Ratio of minute ventilation to volume of carbon dioxide consumption

W:

Watts

References

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Acknowledgements

We are grateful to Glen Davis for access to the near-infrared spectroscopy equipment and Che Fornusek for assistance in its operation. We thank John Eisenhuth for construction of the Go/No-go instrumentation.

Funding

No funding was used to support this study.

Author information

Authors and Affiliations

Authors

Contributions

CMC conceived the original design, with all authors contributing to the design of the final study. DS conducted the experiment. DS, NOD and MH analysed the data. DS drafted the manuscript, to which all authors contributed.

Corresponding author

Correspondence to David Stevens.

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Conflict of interest

None of the authors have any conflict of interest to declare.

Additional information

Communicated by Mark Olfert.

Electronic supplementary material

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Supplementary material 1 (DOCX 17 KB)

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Stevens, D., Halaki, M., Chow, C. et al. The effects of multi-stage exercise with and without concurrent cognitive performance on cardiorespiratory and cerebral haemodynamic responses. Eur J Appl Physiol 118, 2121–2132 (2018). https://doi.org/10.1007/s00421-018-3942-8

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  • DOI: https://doi.org/10.1007/s00421-018-3942-8

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