Key result
Prolonged performance of a cognitively demanding task significantly increased vagal-mediated heart rate variability and subjective fatigue compared to documentary viewing.
Why the study?
Heart Rate Variability has been suggested as a useful tool to assess fatigue-sensitive psychological operations, but the temporal profile of HRV across reactivity, Time-on-Task, and recovery required examination.
Comparison
Cognitively demanding bimodal 2-back task vs documentary viewing
Design
Between- and within-subject study
Authors
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Mental fatigue-linked HRV rises should not guide practice yet; leaves open autonomic mechanisms in clinical populations.
Effect estimate: ηp2 0.14
p-value: p=<0.01
Mental fatigue from prolonged cognitive tasks increases vagal-mediated heart rate variability, indicating parasympathetic activation.
Matuz et al. (2021) studied Mental fatigue (n=41). Gatekeeper task (bimodal 2-back task) vs. Documentary film viewing was evaluated on Time-on-Task related changes in log-transformed root mean square of successive differences (lnRMSSD) (ηp2 0.14, p=<0.01). Prolonged performance of a cognitively demanding task significantly increased vagal-mediated heart rate variability and subjective fatigue compared to documentary viewing.
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