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A single bout of passive exercise mitigates a mental fatigue-induced inhibitory control deficit

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Abstract

Sustained cognitive effort associated with the psychomotor vigilance task (PVT) increases objective and subjective measures of mental fatigue and elicits a post-PVT inhibitory control deficit. In contrast, passive exercise wherein an individual’s limbs are moved via an external force (i.e., mechanically driven cycle ergometer flywheel) provides a postexercise inhibitory control benefit linked to an exercise-based increase in cerebral blood flow. Here, we examined whether passive exercise performed concurrently with the PVT ‘blunts’ an inhibitory control deficit. On separate days, participants (N = 27) completed a 20 min PVT protocol (control condition) and same duration PVT protocol paired with passive cycle ergometry (passive exercise condition). Prior to (i.e., baseline), immediately after and 30 min after each condition inhibitory control was assessed via the antisaccade task. Antisaccades require a goal-directed eye movement (i.e., saccade) mirror-symmetrical to a target and provide an ideal tool for evaluating task-based changes in inhibitory control. PVT results showed that vigilance (as assessed via reaction time: RT) during control and passive exercise conditions decreased from the first to last 5 min of the protocol and increased subjective ratings of mental fatigue. As well, in the control condition, immediate (but not 30-min) post-intervention antisaccade RTs were longer than their baseline counterparts–a result evincing a transient mental fatigue-based inhibitory control deficit. For the passive exercise condition, immediate and 30-min post-intervention antisaccade RTs were shorter than their baseline counterparts and this result was linked to decreased subjective ratings of mental fatigue. Thus, passive exercise ameliorated the selective inhibitory control deficit associated with PVT-induced mental fatigue and thus provides a potential framework to reduce executive dysfunction in vigilance-demanding occupations.

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Data will be made available on reasonable request.

Notes

  1. An important consideration of Ogoh et al’s (2014) study is that Stroop Interference task performance was not evaluated over successive time points in a non-exercise (i.e., control) condition. Given that the Stroop task is influenced by practice-related effects (Davidson et al. 2003), it is possible that Ogoh et al.’s findings do not directly relate to an exercise-mediated inhibitory control benefit.

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Funding

This work is supported by a Discovery Grant (MH) from the Natural Sciences and Engineering Research Council (NSERC) of Canada, and Faculty Scholar and Major Academic Development Fund Awards from the University of Western Ontario.

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Authors

Contributions

JA, BT, AM, HP and MH conceived and designed the research, JA, BT and AM performed experiments; JA and MH analyzed data; JA and MH interpreted results of experiments; MH prepared figures; MH drafted the manuscript; JA, BT, AM and HP edited and revised the manuscript; JA, BT, AM, HP, and MH approved the final version of the manuscript.

Corresponding author

Correspondence to Matthew Heath.

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The authors have no competing interests to declare that are relevant to the content of this article.

Ethical approval

This work was approved by the Non-Medical Research Ethics Board, University of Western Ontario (ID: 120485) and was conducted according to the most recent iteration of the Declaration of Helsinki.

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Communicated by Bill J Yates.

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Ahn, J., Tari, B., Morava, A. et al. A single bout of passive exercise mitigates a mental fatigue-induced inhibitory control deficit. Exp Brain Res 241, 1835–1845 (2023). https://doi.org/10.1007/s00221-023-06640-7

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  • DOI: https://doi.org/10.1007/s00221-023-06640-7

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