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The relationship between exercise intensity, cerebral oxygenation and cognitive performance in young adults

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Abstract

Purpose

To assess the relationship between exercise intensity, cerebral HbO2 and cognitive performance (Executive and non-Executive) in young adults.

Methods

We measured reaction time (RT) and accuracy, during a computerized Stroop task, in 19 young adults (7 males and 12 females). Their mean ± SD age, height, body mass and body mass index (BMI) were 24 ± 4 years, 1.67 ± 0.07 m, 72 ± 14 kg and 25 ± 3 kg m−2, respectively. Each subject performed the Stroop task at rest and during cycling at exercise of low intensity [40 % of peak power output (PPO)], moderate intensity (60 % of PPO) and high intensity (85 % of PPO). Cerebral oxygenation was monitored during the resting and exercise conditions over the prefrontal cortex (PFC) using near-infrared spectroscopy (NIRS).

Results

High-intensity exercise slowed RT in both the Naming (p = 0.04) and the Executive condition (p = 0.04). The analysis also revealed that high-intensity exercise was associated with a decreased accuracy when compared to low-intensity exercise (p = 0.021). Neuroimaging results confirm a decrease of cerebral oxygenation during high-intensity exercise in comparison to low- (p = 0.004) and moderate-intensity exercise (p = 0.003). Correlations revealed that a lower cerebral HbO2 in the prefrontal cortex was associated with slower RT in the Executive condition only (p = 0.04, g = −0.72).

Conclusion

Results of the present study suggest that low to moderate exercise intensity does not alter Executive functioning, but that exercise impairs cognitive functions (Executive and non-Executive) when the physical workload becomes heavy. The cerebral HbO2 correlation suggests that a lower availability of HbO2 was associated with slower RT in the Executive condition only.

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Abbreviations

ANOVA:

Analysis of variance

BMI:

Body mass index

C02 :

Carbon dioxide

CBF:

Cerebral blood flow

CBF:

Cerebral blood flow

fNIRS:

Functional near-infrared spectroscopy

GLM:

General linear model

HbO:

Oxy-hemoglobin

HbR:

Deoxy-hemoglobin

HbT:

Total hemoglobin

HPF:

High pass filter

MICE:

Moderate-intensity continuous exercise

NIRS:

Near-infrared spectroscopy

PaCO2 :

CO2 arterial pressure

PFC:

Prefrontal cortex

PPO:

Peak power output

Ra:

Respiratory alkalosis

RA:

Respiratory acidosis

RCT:

Respiratory compensation threshold

RT:

Reaction time

SD:

Standard deviation

THT:

Transient hypofrontality theory

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

Oxygen uptake

W:

Watts

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The authors of this paper have no conflicts of interest.

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Correspondence to Saïd Mekari.

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Communicated by Toshio Moritani.

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Mekari, S., Fraser, S., Bosquet, L. et al. The relationship between exercise intensity, cerebral oxygenation and cognitive performance in young adults. Eur J Appl Physiol 115, 2189–2197 (2015). https://doi.org/10.1007/s00421-015-3199-4

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  • DOI: https://doi.org/10.1007/s00421-015-3199-4

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